Vulnerabilities > CVE-2017-18258 - Allocation of Resources Without Limits or Throttling vulnerability in Xmlsoft Libxml2

047910
CVSS 4.3 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
PARTIAL
network
xmlsoft
CWE-770
nessus
NVD
Published: 2018-04-08
Updated: 2020-09-10

Summary

The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

Vulnerable Configurations

Part Description Count
Application
Xmlsoft
156

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Locate and Exploit Test APIs
    An attacker exploits a sample, demonstration, or test API that is insecure by default and should not be resident on production systems. Some applications include APIs that are intended to allow an administrator to test and refine their domain. These APIs should usually be disabled once a system enters a production environment. Testing APIs may expose a great deal of diagnostic information intended to aid an administrator, but which can also be used by an attacker to further refine their attack. Moreover, testing APIs may not have adequate security controls or may not have undergone rigorous testing since they were not intended for use in production environments. As such, they may have many flaws and vulnerabilities that would allow an attacker to severely disrupt a target.
  • Flooding
    An attacker consumes the resources of a target by rapidly engaging in a large number of interactions with the target. This type of attack generally exposes a weakness in rate limiting or flow control in management of interactions. Since each request consumes some of the target's resources, if a sufficiently large number of requests must be processed at the same time then the target's resources can be exhausted. The degree to which the attack is successful depends upon the volume of requests in relation to the amount of the resource the target has access to, and other mitigating circumstances such as the target's ability to shift load or acquired additional resources to deal with the depletion. The more protected the resource and the greater the quantity of it that must be consumed, the more resources the attacker may need to have at their disposal. A typical TCP/IP flooding attack is a Distributed Denial-of-Service attack where many machines simultaneously make a large number of requests to a target. Against a target with strong defenses and a large pool of resources, many tens of thousands of attacking machines may be required. When successful this attack prevents legitimate users from accessing the service and can cause the target to crash. This attack differs from resource depletion through leaks or allocations in that the latter attacks do not rely on the volume of requests made to the target but instead focus on manipulation of the target's operations. The key factor in a flooding attack is the number of requests the attacker can make in a given period of time. The greater this number, the more likely an attack is to succeed against a given target.
  • Excessive Allocation
    An attacker causes the target to allocate excessive resources to servicing the attackers' request, thereby reducing the resources available for legitimate services and degrading or denying services. Usually, this attack focuses on memory allocation, but any finite resource on the target could be the attacked, including bandwidth, processing cycles, or other resources. This attack does not attempt to force this allocation through a large number of requests (that would be Resource Depletion through Flooding) but instead uses one or a small number of requests that are carefully formatted to force the target to allocate excessive resources to service this request(s). Often this attack takes advantage of a bug in the target to cause the target to allocate resources vastly beyond what would be needed for a normal request. For example, using an Integer Attack, the attacker could cause a variable that controls allocation for a request to hold an excessively large value. Excessive allocation of resources can render a service degraded or unavailable to legitimate users and can even lead to crashing of the target.
  • XML Ping of the Death
    An attacker initiates a resource depletion attack where a large number of small XML messages are delivered at a sufficiently rapid rate to cause a denial of service or crash of the target. Transactions such as repetitive SOAP transactions can deplete resources faster than a simple flooding attack because of the additional resources used by the SOAP protocol and the resources necessary to process SOAP messages. The transactions used are immaterial as long as they cause resource utilization on the target. In other words, this is a normal flooding attack augmented by using messages that will require extra processing on the target.
  • XML Entity Expansion
    An attacker submits an XML document to a target application where the XML document uses nested entity expansion to produce an excessively large output XML. XML allows the definition of macro-like structures that can be used to simplify the creation of complex structures. However, this capability can be abused to create excessive demands on a processor's CPU and memory. A small number of nested expansions can result in an exponential growth in demands on memory.

Nessus

  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2020-1190.NASL
    descriptionThe remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1190 advisory. - libxml2: DoS caused by incorrect error detection during XZ decompression (CVE-2015-8035) - libxml2: Use after free triggered by XPointer paths beginning with range-to (CVE-2016-5131) - libxml2: Use after free in xmlXPathCompOpEvalPositionalPredicate() function in xpath.c (CVE-2017-15412) - libxml2: Unrestricted memory usage in xz_head() function in xzlib.c (CVE-2017-18258) - libxml2: NULL pointer dereference in xmlXPathCompOpEval() function in xpath.c (CVE-2018-14404) - libxml2: Infinite loop caused by incorrect error detection during LZMA decompression (CVE-2018-14567) Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-06-06
    modified2020-04-10
    plugin id135358
    published2020-04-10
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135358
    titleCentOS 7 : libxml2 (CESA-2020:1190)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2020:1190 and 
# CentOS Errata and Security Advisory 2020:1190 respectively.
#

include("compat.inc");

if (description)
{
  script_id(135358);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/05");

  script_cve_id("CVE-2015-8035", "CVE-2016-5131", "CVE-2017-15412", "CVE-2017-18258", "CVE-2018-14404", "CVE-2018-14567");
  script_xref(name:"RHSA", value:"2020:1190");

  script_name(english:"CentOS 7 : libxml2 (CESA-2020:1190)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote CentOS host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description",
    value:
"The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as
referenced in the RHSA-2020:1190 advisory.

  - libxml2: DoS caused by incorrect error detection during
    XZ decompression (CVE-2015-8035)

  - libxml2: Use after free triggered by XPointer paths
    beginning with range-to (CVE-2016-5131)

  - libxml2: Use after free in
    xmlXPathCompOpEvalPositionalPredicate() function in
    xpath.c (CVE-2017-15412)

  - libxml2: Unrestricted memory usage in xz_head() function
    in xzlib.c (CVE-2017-18258)

  - libxml2: NULL pointer dereference in
    xmlXPathCompOpEval() function in xpath.c
    (CVE-2018-14404)

  - libxml2: Infinite loop caused by incorrect error
    detection during LZMA decompression (CVE-2018-14567)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number."
  );
  # https://lists.centos.org/pipermail/centos-cr-announce/2020-April/012518.html
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?2ed8ea19"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Update the affected libxml2 packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2016-5131");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxml2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxml2-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:libxml2-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2015/11/18");
  script_set_attribute(attribute:"patch_publication_date", value:"2020/04/08");
  script_set_attribute(attribute:"plugin_publication_date", value:"2020/04/10");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"CentOS Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 7.x", "CentOS " + os_ver);

if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);


cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);


flag = 0;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxml2-2.9.1-6.el7.4")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxml2-devel-2.9.1-6.el7.4")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxml2-python-2.9.1-6.el7.4")) flag++;
if (rpm_check(release:"CentOS-7", cpu:"x86_64", reference:"libxml2-static-2.9.1-6.el7.4")) flag++;


if (flag)
{
  cr_plugin_caveat = '\n' +
    'NOTE: The security advisory associated with this vulnerability has a\n' +
    'fixed package version that may only be available in the continuous\n' +
    'release (CR) repository for CentOS, until it is present in the next\n' +
    'point release of CentOS.\n\n' +

    'If an equal or higher package level does not exist in the baseline\n' +
    'repository for your major version of CentOS, then updates from the CR\n' +
    'repository will need to be applied in order to address the\n' +
    'vulnerability.\n';
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get() + cr_plugin_caveat
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libxml2 / libxml2-devel / libxml2-python / libxml2-static");
}
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2018-3081-1.NASL
    descriptionThis update for libxml2 fixes the following security issues : CVE-2018-9251: The xz_decomp function allowed remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint (bsc#1088279). CVE-2018-14567: Prevent denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint (bsc#1105166). CVE-2018-14404: Prevent NULL pointer dereference in the xmlXPathCompOpEval() function when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case leading to a denial of service attack (bsc#1102046). CVE-2017-18258: The xz_head function allowed remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality did not restrict memory usage to what is required for a legitimate file (bsc#1088601). Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id118032
    published2018-10-10
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/118032
    titleSUSE SLED12 / SLES12 Security Update : libxml2 (SUSE-SU-2018:3081-1)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:3081-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(118032);
  script_version("1.3");
  script_cvs_date("Date: 2019/09/10 13:51:49");

  script_cve_id("CVE-2017-18258", "CVE-2018-14404", "CVE-2018-14567", "CVE-2018-9251");

  script_name(english:"SUSE SLED12 / SLES12 Security Update : libxml2 (SUSE-SU-2018:3081-1)");
  script_summary(english:"Checks rpm output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote SUSE host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for libxml2 fixes the following security issues :

CVE-2018-9251: The xz_decomp function allowed remote attackers to
cause a denial of service (infinite loop) via a crafted XML file that
triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint
(bsc#1088279).

CVE-2018-14567: Prevent denial of service (infinite loop) via a
crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by
xmllint (bsc#1105166).

CVE-2018-14404: Prevent NULL pointer dereference in the
xmlXPathCompOpEval() function when parsing an invalid XPath expression
in the XPATH_OP_AND or XPATH_OP_OR case leading to a denial of service
attack (bsc#1102046).

CVE-2017-18258: The xz_head function allowed remote attackers to cause
a denial of service (memory consumption) via a crafted LZMA file,
because the decoder functionality did not restrict memory usage to
what is required for a legitimate file (bsc#1088601).

Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1088279"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1088601"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1102046"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=1105166"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2017-18258/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-14404/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-14567/"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-9251/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20183081-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?01eed67d"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use the SUSE recommended
installation methods like YaST online_update or 'zypper patch'.

Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Software Development Kit 12-SP3:zypper in -t
patch SUSE-SLE-SDK-12-SP3-2018-2181=1

SUSE Linux Enterprise Server 12-SP3:zypper in -t patch
SUSE-SLE-SERVER-12-SP3-2018-2181=1

SUSE Linux Enterprise Desktop 12-SP3:zypper in -t patch
SUSE-SLE-DESKTOP-12-SP3-2018-2181=1

SUSE CaaS Platform ALL :

To install this update, use the SUSE CaaS Platform Velum dashboard. It
will inform you if it detects new updates and let you then trigger
updating of the complete cluster in a controlled way.

SUSE CaaS Platform 3.0 :

To install this update, use the SUSE CaaS Platform Velum dashboard. It
will inform you if it detects new updates and let you then trigger
updating of the complete cluster in a controlled way.

OpenStack Cloud Magnum Orchestration 7:zypper in -t patch
SUSE-OpenStack-Cloud-Magnum-Orchestration-7-2018-2181=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-tools");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-tools-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:python-libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:python-libxml2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:python-libxml2-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:12");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/04/04");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/10/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/10/10");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"SuSE Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/SuSE/release", "Host/SuSE/rpm-list");

  exit(0);
}


include("audit.inc");
include("global_settings.inc");
include("rpm.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/SuSE/release");
if (isnull(release) || release !~ "^(SLED|SLES)") audit(AUDIT_OS_NOT, "SUSE");
os_ver = pregmatch(pattern: "^(SLE(S|D)\d+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "SUSE");
os_ver = os_ver[1];
if (! preg(pattern:"^(SLED12|SLES12)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLED12 / SLES12", "SUSE " + os_ver);

if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if (cpu !~ "^i[3-6]86$" && "x86_64" >!< cpu && "s390x" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "SUSE " + os_ver, cpu);

sp = get_kb_item("Host/SuSE/patchlevel");
if (isnull(sp)) sp = "0";
if (os_ver == "SLES12" && (! preg(pattern:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLES12 SP3", os_ver + " SP" + sp);
if (os_ver == "SLED12" && (! preg(pattern:"^(3)$", string:sp))) audit(AUDIT_OS_NOT, "SLED12 SP3", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-2-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-2-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-debugsource-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-tools-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-tools-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"python-libxml2-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"python-libxml2-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"python-libxml2-debugsource-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-2-32bit-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLES12", sp:"3", reference:"libxml2-2-debuginfo-32bit-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-2-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-2-32bit-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-2-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-2-debuginfo-32bit-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-debugsource-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-tools-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"libxml2-tools-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"python-libxml2-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"python-libxml2-debuginfo-2.9.4-46.15.1")) flag++;
if (rpm_check(release:"SLED12", sp:"3", cpu:"x86_64", reference:"python-libxml2-debugsource-2.9.4-46.15.1")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
  else security_warning(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libxml2");
}
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-1316.NASL
    descriptionAccording to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A null pointer dereference vulnerability exists in the xpath function of libxml2 when parsing invalid XPath expression. Applications processing untrusted XSL format inputs with the use of libxml2 library may be vulnerable to denial of service attack due to crash of the application.(CVE-2018-14404) - The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.(CVE-2017-18258) - A denial of service flaw was found in libxml2. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause that application to crash.(CVE-2015-8035) Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-05-06
    modified2019-05-01
    plugin id124443
    published2019-05-01
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/124443
    titleEulerOS 2.0 SP5 : libxml2 (EulerOS-SA-2019-1316)
    code
    #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(124443);
  script_version("1.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/04");

  script_cve_id(
    "CVE-2015-8035",
    "CVE-2017-18258",
    "CVE-2018-14404"
  );

  script_name(english:"EulerOS 2.0 SP5 : libxml2 (EulerOS-SA-2019-1316)");
  script_summary(english:"Checks the rpm output for the updated packages.");

  script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS host is missing multiple security updates.");
  script_set_attribute(attribute:"description", value:
"According to the versions of the libxml2 packages installed, the
EulerOS installation on the remote host is affected by the following
vulnerabilities :

  - A null pointer dereference vulnerability exists in the
    xpath function of libxml2 when parsing invalid XPath
    expression. Applications processing untrusted XSL
    format inputs with the use of libxml2 library may be
    vulnerable to denial of service attack due to crash of
    the application.(CVE-2018-14404)

  - The xz_head function in xzlib.c in libxml2 before 2.9.6
    allows remote attackers to cause a denial of service
    (memory consumption) via a crafted LZMA file, because
    the decoder functionality does not restrict memory
    usage to what is required for a legitimate
    file.(CVE-2017-18258)

  - A denial of service flaw was found in libxml2. A remote
    attacker could provide a specially crafted XML or HTML
    file that, when processed by an application using
    libxml2, would cause that application to
    crash.(CVE-2015-8035)

Note that Tenable Network Security has extracted the preceding
description block directly from the EulerOS security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.");
  # https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2019-1316
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?e8dbbbe7");
  script_set_attribute(attribute:"solution", value:
"Update the affected libxml2 packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");

  script_set_attribute(attribute:"patch_publication_date", value:"2019/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/05/01");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxml2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libxml2-python");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:2.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Huawei Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/sp");
  script_exclude_keys("Host/EulerOS/uvp_version");

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("rpm.inc");

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);

release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
if (release !~ "^EulerOS release 2\.0(\D|$)") audit(AUDIT_OS_NOT, "EulerOS 2.0");

sp = get_kb_item("Host/EulerOS/sp");
if (isnull(sp) || sp !~ "^(5)$") audit(AUDIT_OS_NOT, "EulerOS 2.0 SP5");

uvp = get_kb_item("Host/EulerOS/uvp_version");
if (!empty_or_null(uvp)) audit(AUDIT_OS_NOT, "EulerOS 2.0 SP5", "EulerOS UVP " + uvp);

if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_ARCH_NOT, "i686 / x86_64", cpu);

flag = 0;

pkgs = ["libxml2-2.9.1-6.3.h15.eulerosv2r7",
        "libxml2-devel-2.9.1-6.3.h15.eulerosv2r7",
        "libxml2-python-2.9.1-6.3.h15.eulerosv2r7"];

foreach (pkg in pkgs)
  if (rpm_check(release:"EulerOS-2.0", sp:"5", reference:pkg)) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : rpm_report_get()
  );
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "libxml2");
}
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-1559.NASL
    descriptionAccording to the versions of the libxml2 packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : - This library allows to manipulate XML files. It includes support to read, modify and write XML and HTML files. There is DTDs support this includes parsing and validation even with complex DtDs, either at parse time or later once the document has been modified. The output can be a simple SAX stream or and in-memory DOM like representations.In this case one can use the built-in XPath and XPointer implementation to select sub nodes or ranges. A flexible Input/Output mechanism is available, with existing HTTP and FTP modules and combined to an URI library. - Security Fixi1/4^esi1/4%0: - Multiple integer overflows in libxml2, as used in Google Chrome before 20.0.1132.43 and other products, on 64-bit Linux platforms allow remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors.i1/4^CVE-2012-2807i1/4%0 - A denial of service flaw was found in libxml2. A remote attacker could provide a specially crafted XML or HTML file that, when processed by an application using libxml2, would cause that application to crash.i1/4^CVE-2015-8035i1/4%0 - The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service i1/4^memory consumptioni1/4%0 via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.i1/4^CVE-2017-18258i1/4%0 - A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEvali1/4^i1/4%0 function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.i1/4^CVE-2018-14404i1/4%0 Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-19
    modified2019-05-15
    plugin id125103
    published2019-05-15
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/125103
    titleEulerOS Virtualization 3.0.1.0 : libxml2 (EulerOS-SA-2019-1559)
  • NASL familyJunos Local Security Checks
    NASL idJUNIPER_JSA10916.NASL
    descriptionAccording to its self-reported version number, the remote Juniper Junos device is affected by a Multiple vulnerabilities in libxml2: - Format string vulnerability in libxml2 before 2.9.4 allows attackers to have unspecified impact via format string specifiers in unknown vectors.(CVE-2016-4448) - The xmlStringGetNodeList function in tree.c in libxml2 2.9.3 and earlier, when used in recovery mode, allows context-dependent attackers to cause a denial of service (infinite recursion, stack consumption, and application crash) via a crafted XML document. (CVE-2016-3627)
    last seen2020-06-01
    modified2020-06-02
    plugin id121070
    published2019-01-11
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/121070
    titleJunos OS: Multiple vulnerabilities in libxml2 (JSA10916)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20200407_LIBXML2_ON_SL7_X.NASL
    description* libxml2: Use after free triggered by XPointer paths beginning with range-to * libxml2: Use after free in xmlXPathCompOpEvalPositionalPredicate() function in xpath.c * libxml2: DoS caused by incorrect error detection during XZ decompression * libxml2: NULL pointer dereference in xmlXPathCompOpEval() function in xpath.c * libxml2: Unrestricted memory usage in xz_head() function in xzlib.c * libxml2: Infinite loop caused by incorrect error detection during LZMA decompression
    last seen2020-04-30
    modified2020-04-21
    plugin id135819
    published2020-04-21
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135819
    titleScientific Linux Security Update : libxml2 on SL7.x x86_64 (20200407)
  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1524.NASL
    descriptionCVE-2018-14404 Fix of a NULL pointer dereference which might result in a crash and thus in a denial of service. CVE-2018-14567 and CVE-2018-9251 Approvement in LZMA error handling which prevents an infinite loop. CVE-2017-18258 Limit available memory to 100MB to avoid exhaustive memory consumption by malicious files. For Debian 8
    last seen2020-06-01
    modified2020-06-02
    plugin id117811
    published2018-09-28
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/117811
    titleDebian DLA-1524-1 : libxml2 security update
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-1149.NASL
    descriptionThis update for libxml2 fixes the following security issues : - CVE-2018-9251: The xz_decomp function allowed remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint (bsc#1088279). - CVE-2018-14567: Prevent denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint (bsc#1105166). - CVE-2018-14404: Prevent NULL pointer dereference in the xmlXPathCompOpEval() function when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case leading to a denial of service attack (bsc#1102046). - CVE-2017-18258: The xz_head function allowed remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality did not restrict memory usage to what is required for a legitimate file (bsc#1088601). This update was imported from the SUSE:SLE-12-SP2:Update update project.
    last seen2020-06-05
    modified2018-10-15
    plugin id118115
    published2018-10-15
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/118115
    titleopenSUSE Security Update : libxml2 (openSUSE-2018-1149)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-1614.NASL
    descriptionAccording to the versions of the libxml2 packages installed, the EulerOS Virtualization for ARM 64 installation on the remote host is affected by the following vulnerabilities : - This library allows to manipulate XML files. It includes support to read, modify and write XML and HTML files. There is DTDs support this includes parsing and validation even with complex DtDs, either at parse time or later once the document has been modified. The output can be a simple SAX stream or and in-memory DOM like representations.In this case one can use the built-in XPath and XPointer implementation to select sub nodes or ranges. A flexible Input/Output mechanism is available, with existing HTTP and FTP modules and combined to an URI library. - Security Fixi1/4^esi1/4%0: - The xz_head function in xzlib.c in libxml2 before 2.9.6 allows remote attackers to cause a denial of service i1/4^memory consumptioni1/4%0 via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.i1/4^CVE-2017-18258i1/4%0 - A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEvali1/4^i1/4%0 function of libxml2 through 2.9.8 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs with the use of the libxml2 library may be vulnerable to a denial of service attack due to a crash of the application.i1/4^CVE-2018-14404i1/4%0 Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-03-19
    modified2019-05-30
    plugin id125566
    published2019-05-30
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/125566
    titleEulerOS Virtualization for ARM 64 3.0.2.0 : libxml2 (EulerOS-SA-2019-1614)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-2491.NASL
    descriptionAccording to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - A remote code execution vulnerability in libxml2 could enable an attacker using a specially crafted file to execute arbitrary code within the context of an unprivileged process. This issue is rated as High due to the possibility of remote code execution in an application that uses this library. Product: Android. Versions: 4.4.4, 5.0.2, 5.1.1, 6.0, 6.0.1, 7.0, 7.1.1, 7.1.2. Android ID: A-37104170.(CVE-2017-0663) - libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035 and CVE-2018-9251.(CVE-2018-14567) - The htmlParseTryOrFinish function in HTMLparser.c in libxml2 2.9.4 allows attackers to cause a denial of service (buffer over-read) or information disclosure.(CVE-2017-8872) - libxml2 20904-GITv2.9.4-16-g0741801 is vulnerable to a stack-based buffer overflow. The function xmlSnprintfElementContent in valid.c is supposed to recursively dump the element content definition into a char buffer
    last seen2020-05-08
    modified2019-12-04
    plugin id131644
    published2019-12-04
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/131644
    titleEulerOS 2.0 SP2 : libxml2 (EulerOS-SA-2019-2491)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-2626.NASL
    descriptionAccording to the versions of the libxml2 packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : - This library allows to manipulate XML files. It includes support to read, modify and write XML and HTML files. There is DTDs support this includes parsing and validation even with complex DtDs, either at parse time or later once the document has been modified. The output can be a simple SAX stream or and in-memory DOM like representations. In this case one can use the built-in XPath and XPointer implementation to select sub nodes or ranges. A flexible Input/Output mechanism is available, with existing HTTP and FTP modules and combined to an URI library.Security Fix(es):** DISPUTED ** libxml2 2.9.4, when used in recover mode, allows remote attackers to cause a denial of service (NULL pointer dereference) via a crafted XML document. NOTE: The maintainer states
    last seen2020-05-08
    modified2019-12-18
    plugin id132161
    published2019-12-18
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/132161
    titleEulerOS 2.0 SP3 : libxml2 (EulerOS-SA-2019-2626)
  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2020-1190.NASL
    descriptionThe remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2020:1190 advisory. - libxml2: DoS caused by incorrect error detection during XZ decompression (CVE-2015-8035) - libxml2: Use after free triggered by XPointer paths beginning with range-to (CVE-2016-5131) - libxml2: Use after free in xmlXPathCompOpEvalPositionalPredicate() function in xpath.c (CVE-2017-15412) - libxml2: Unrestricted memory usage in xz_head() function in xzlib.c (CVE-2017-18258) - libxml2: NULL pointer dereference in xmlXPathCompOpEval() function in xpath.c (CVE-2018-14404) - libxml2: Infinite loop caused by incorrect error detection during LZMA decompression (CVE-2018-14567) Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-04-23
    modified2020-04-01
    plugin id135071
    published2020-04-01
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135071
    titleRHEL 7 : libxml2 (RHSA-2020:1190)

Redhat

rpms
  • libxml2-0:2.9.1-6.el7.4
  • libxml2-debuginfo-0:2.9.1-6.el7.4
  • libxml2-devel-0:2.9.1-6.el7.4
  • libxml2-python-0:2.9.1-6.el7.4
  • libxml2-static-0:2.9.1-6.el7.4

References