Vulnerabilities > CVE-2018-1063 - Link Following vulnerability in multiple products

047910
CVSS 4.4 - MEDIUM
Attack vector
LOCAL
Attack complexity
LOW
Privileges required
LOW
Confidentiality impact
LOW
Integrity impact
LOW
Availability impact
NONE
local
low complexity
redhat
selinux-project
CWE-59
nessus
NVD
Published: 2018-03-02
Updated: 2023-11-07

Summary

Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing). The issue was found in policycoreutils 2.5-11.

Vulnerable Configurations

Part Description Count
OS
Redhat
1
Application
Selinux_Project
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Symlink Attack
    An attacker positions a symbolic link in such a manner that the targeted user or application accesses the link's endpoint, assuming that it is accessing a file with the link's name. The endpoint file may be either output or input. If the file is output, the result is that the endpoint is modified, instead of a file at the intended location. Modifications to the endpoint file may include appending, overwriting, corrupting, changing permissions, or other modifications. In some variants of this attack the attacker may be able to control the change to a file while in other cases they cannot. The former is especially damaging since the attacker may be able to grant themselves increased privileges or insert false information, but the latter can also be damaging as it can expose sensitive information or corrupt or destroy vital system or application files. Alternatively, the endpoint file may serve as input to the targeted application. This can be used to feed malformed input into the target or to cause the target to process different information, possibly allowing the attacker to control the actions of the target or to cause the target to expose information to the attacker. Moreover, the actions taken on the endpoint file are undertaken with the permissions of the targeted user or application, which may exceed the permissions that the attacker would normally have.
  • Accessing, Modifying or Executing Executable Files
    An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
  • Leverage Executable Code in Non-Executable Files
    An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high. The attack can be directed at a client system, such as causing buffer overrun through loading seemingly benign image files, as in Microsoft Security Bulletin MS04-028 where specially crafted JPEG files could cause a buffer overrun once loaded into the browser. Another example targets clients reading pdf files. In this case the attacker simply appends javascript to the end of a legitimate url for a pdf (http://www.gnucitizen.org/blog/danger-danger-danger/) http://path/to/pdf/file.pdf#whatever_name_you_want=javascript:your_code_here The client assumes that they are reading a pdf, but the attacker has modified the resource and loaded executable javascript into the client's browser process. The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality. The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.

Nessus

  • NASL familyRed Hat Local Security Checks
    NASL idREDHAT-RHSA-2018-0913.NASL
    descriptionAn update for policycoreutils is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section. The policycoreutils packages contain the core policy utilities required to manage a SELinux environment. Security Fix(es) : * policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead (CVE-2018-1063) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. This issue was discovered by Renaud Metrich (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id108991
    published2018-04-11
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/108991
    titleRHEL 7 : policycoreutils (RHSA-2018:0913)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2018:0913. The text 
# itself is copyright (C) Red Hat, Inc.
#

include("compat.inc");

if (description)
{
  script_id(108991);
  script_version("1.8");
  script_cvs_date("Date: 2019/10/24 15:35:44");

  script_cve_id("CVE-2018-1063");
  script_xref(name:"RHSA", value:"2018:0913");

  script_name(english:"RHEL 7 : policycoreutils (RHSA-2018:0913)");
  script_summary(english:"Checks the rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Red Hat host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"An update for policycoreutils is now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Low. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link (s) in the References section.

The policycoreutils packages contain the core policy utilities
required to manage a SELinux environment.

Security Fix(es) :

* policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp
change the context of their target instead (CVE-2018-1063)

For more details about the security issue(s), including the impact, a
CVSS score, and other related information, refer to the CVE page(s)
listed in the References section.

This issue was discovered by Renaud Metrich (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.5 Release Notes linked from the References section."
  );
  # https://access.redhat.com/documentation/en-US/red_hat_enterprise_linux/7/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?dde41582"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2018:0913"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2018-1063"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-newrole");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-restorecond");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:policycoreutils-sandbox");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.6");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:7.7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/04/10");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/11");
  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:"Red Hat Local Security Checks");

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

  exit(0);
}


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

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

if (!get_kb_item("Host/RedHat/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$" && "s390" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Red Hat", cpu);

yum_updateinfo = get_kb_item("Host/RedHat/yum-updateinfo");
if (!empty_or_null(yum_updateinfo)) 
{
  rhsa = "RHSA-2018:0913";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : yum_report 
    );
    exit(0);
  }
  else
  {
    audit_message = "affected by Red Hat security advisory " + rhsa;
    audit(AUDIT_OS_NOT, audit_message);
  }
}
else
{
  flag = 0;
  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", reference:"policycoreutils-debuginfo-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", reference:"policycoreutils-devel-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-gui-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-gui-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-newrole-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-newrole-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-python-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-python-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-restorecond-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-restorecond-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"s390x", reference:"policycoreutils-sandbox-2.5-22.el7")) flag++;

  if (rpm_check(release:"RHEL7", cpu:"x86_64", reference:"policycoreutils-sandbox-2.5-22.el7")) flag++;


  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_NOTE,
      extra      : rpm_report_get() + redhat_report_package_caveat()
    );
    exit(0);
  }
  else
  {
    tested = pkg_tests_get();
    if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
    else audit(AUDIT_PACKAGE_NOT_INSTALLED, "policycoreutils / policycoreutils-debuginfo / policycoreutils-devel / etc");
  }
}
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2018-0927-1.NASL
    descriptionThis update for policycoreutils fixes the following issues : - CVE-2018-1063: Prevent chcon from following symlinks in /tmp, /var/tmp, /var/run and /var/lib/debug (bsc#1083624). 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 id109015
    published2018-04-12
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109015
    titleSUSE SLES11 Security Update : policycoreutils (SUSE-SU-2018:0927-1)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2018:0927-1.
# The text itself is copyright (C) SUSE.
#

include("compat.inc");

if (description)
{
  script_id(109015);
  script_version("1.4");
  script_cvs_date("Date: 2019/09/10 13:51:47");

  script_cve_id("CVE-2018-1063");

  script_name(english:"SUSE SLES11 Security Update : policycoreutils (SUSE-SU-2018:0927-1)");
  script_summary(english:"Checks rpm output for the updated package.");

  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 policycoreutils fixes the following issues :

  - CVE-2018-1063: Prevent chcon from following symlinks in
    /tmp, /var/tmp, /var/run and /var/lib/debug
    (bsc#1083624).

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=1083624"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2018-1063/"
  );
  # https://www.suse.com/support/update/announcement/2018/suse-su-20180927-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?371831ef"
  );
  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 Server 11-SP4:zypper in -t patch
slessp4-policycoreutils-13556=1

SUSE Linux Enterprise Debuginfo 11-SP4:zypper in -t patch
dbgsp4-policycoreutils-13556=1"
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/04/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/12");
  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:"^(SLES11)$", string:os_ver)) audit(AUDIT_OS_NOT, "SUSE SLES11", "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 == "SLES11" && (! preg(pattern:"^(4)$", string:sp))) audit(AUDIT_OS_NOT, "SLES11 SP4", os_ver + " SP" + sp);


flag = 0;
if (rpm_check(release:"SLES11", sp:"4", reference:"policycoreutils-2.0.79-4.9.3.3")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "policycoreutils");
}
  • NASL familyOracle Linux Local Security Checks
    NASL idORACLELINUX_ELSA-2018-0913.NASL
    descriptionFrom Red Hat Security Advisory 2018:0913 : An update for policycoreutils is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section. The policycoreutils packages contain the core policy utilities required to manage a SELinux environment. Security Fix(es) : * policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead (CVE-2018-1063) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. This issue was discovered by Renaud Metrich (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id109110
    published2018-04-18
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109110
    titleOracle Linux 7 : policycoreutils (ELSA-2018-0913)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Red Hat Security Advisory RHSA-2018:0913 and 
# Oracle Linux Security Advisory ELSA-2018-0913 respectively.
#

include("compat.inc");

if (description)
{
  script_id(109110);
  script_version("1.3");
  script_cvs_date("Date: 2019/09/27 13:00:38");

  script_cve_id("CVE-2018-1063");
  script_xref(name:"RHSA", value:"2018:0913");

  script_name(english:"Oracle Linux 7 : policycoreutils (ELSA-2018-0913)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Oracle Linux host is missing one or more security updates."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"From Red Hat Security Advisory 2018:0913 :

An update for policycoreutils is now available for Red Hat Enterprise
Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Low. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link (s) in the References section.

The policycoreutils packages contain the core policy utilities
required to manage a SELinux environment.

Security Fix(es) :

* policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp
change the context of their target instead (CVE-2018-1063)

For more details about the security issue(s), including the impact, a
CVSS score, and other related information, refer to the CVE page(s)
listed in the References section.

This issue was discovered by Renaud Metrich (Red Hat).

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.5 Release Notes linked from the References section."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://oss.oracle.com/pipermail/el-errata/2018-April/007615.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected policycoreutils packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-newrole");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-restorecond");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:oracle:linux:policycoreutils-sandbox");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:oracle:linux:7");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/03/02");
  script_set_attribute(attribute:"patch_publication_date", value:"2018/04/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/04/18");
  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:"Oracle Linux Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/OracleLinux", "Host/RedHat/release", "Host/RedHat/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);
if (!get_kb_item("Host/OracleLinux")) audit(AUDIT_OS_NOT, "Oracle Linux");
release = get_kb_item("Host/RedHat/release");
if (isnull(release) || !pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux)", string:release)) audit(AUDIT_OS_NOT, "Oracle Linux");
os_ver = pregmatch(pattern: "Oracle (?:Linux Server|Enterprise Linux) .*release ([0-9]+(\.[0-9]+)?)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Oracle Linux");
os_ver = os_ver[1];
if (! preg(pattern:"^7([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Oracle Linux 7", "Oracle Linux " + os_ver);

if (!get_kb_item("Host/RedHat/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, "Oracle Linux", cpu);
if ("x86_64" >!< cpu) audit(AUDIT_ARCH_NOT, "x86_64", cpu);

flag = 0;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-devel-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-gui-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-newrole-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-python-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-restorecond-2.5-22.el7")) flag++;
if (rpm_check(release:"EL7", cpu:"x86_64", reference:"policycoreutils-sandbox-2.5-22.el7")) flag++;


if (flag)
{
  if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "policycoreutils / policycoreutils-devel / policycoreutils-gui / etc");
}
  • NASL familyAmazon Linux Local Security Checks
    NASL idAL2_ALAS-2018-1076.NASL
    descriptionContext relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing).(CVE-2018-1063)
    last seen2020-06-01
    modified2020-06-02
    plugin id117590
    published2018-09-19
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/117590
    titleAmazon Linux 2 : policycoreutils (ALAS-2018-1076)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2018-1076.
#

include("compat.inc");

if (description)
{
  script_id(117590);
  script_version("1.1");
  script_cvs_date("Date: 2018/09/19 10:04:09");

  script_cve_id("CVE-2018-1063");
  script_xref(name:"ALAS", value:"2018-1076");

  script_name(english:"Amazon Linux 2 : policycoreutils (ALAS-2018-1076)");
  script_summary(english:"Checks rpm output for the updated packages");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Amazon Linux 2 host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Context relabeling of filesystems is vulnerable to symbolic link
attack, allowing a local, unprivileged malicious entity to change the
SELinux context of an arbitrary file to a context with few
restrictions. This only happens when the relabeling process is done,
usually when taking SELinux state from disabled to enable (permissive
or enforcing).(CVE-2018-1063)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://alas.aws.amazon.com/AL2/ALAS-2018-1076.html"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Run 'yum update policycoreutils' to update your system."
  );
  script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:N");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-gui");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-newrole");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-restorecond");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:policycoreutils-sandbox");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux:2");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/19");
  script_end_attributes();

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

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "2")
{
  if (os_ver == 'A') os_ver = 'AMI';
  audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}

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


flag = 0;
if (rpm_check(release:"AL2", reference:"policycoreutils-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-debuginfo-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-devel-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-gui-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-newrole-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-python-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-restorecond-2.5-22.amzn2")) flag++;
if (rpm_check(release:"AL2", reference:"policycoreutils-sandbox-2.5-22.amzn2")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
  else security_note(0);
  exit(0);
}
else
{
  tested = pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "policycoreutils / policycoreutils-debuginfo / policycoreutils-devel / etc");
}
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2019-2400.NASL
    descriptionAccording to the version of the policycoreutils packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing). The issue was found in policycoreutils 2.5-11.(CVE-2018-1063) 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 seen2020-05-08
    modified2019-12-10
    plugin id131892
    published2019-12-10
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/131892
    titleEulerOS 2.0 SP2 : policycoreutils (EulerOS-SA-2019-2400)
  • NASL familyNewStart CGSL Local Security Checks
    NASL idNEWSTART_CGSL_NS-SA-2019-0030_POLICYCOREUTILS.NASL
    descriptionThe remote NewStart CGSL host, running version CORE 5.04 / MAIN 5.04, has policycoreutils packages installed that are affected by a vulnerability: - Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing). (CVE-2018-1063) Note that Nessus has not tested for this issue but has instead relied only on the application
    last seen2020-06-01
    modified2020-06-02
    plugin id127195
    published2019-08-12
    reporterThis script is Copyright (C) 2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/127195
    titleNewStart CGSL CORE 5.04 / MAIN 5.04 : policycoreutils Vulnerability (NS-SA-2019-0030)
  • NASL familyHuawei Local Security Checks
    NASL idEULEROS_SA-2020-1423.NASL
    descriptionAccording to the version of the policycoreutils packages installed, the EulerOS installation on the remote host is affected by the following vulnerability : - Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing). The issue was found in policycoreutils 2.5-11.(CVE-2018-1063) 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
    modified2020-04-15
    plugin id135552
    published2020-04-15
    reporterThis script is Copyright (C) 2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/135552
    titleEulerOS 2.0 SP3 : policycoreutils (EulerOS-SA-2020-1423)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_SU-2018-0926-1.NASL
    descriptionThis update for policycoreutils fixes the following issues : - CVE-2018-1063: Fixed problem to prevent chcon from following symlinks in /tmp, /var/tmp, /var/run and /var/lib/debug (bsc#1083624). 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 id109014
    published2018-04-12
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109014
    titleSUSE SLES12 Security Update : policycoreutils (SUSE-SU-2018:0926-1)
  • NASL familyScientific Linux Local Security Checks
    NASL idSL_20180410_POLICYCOREUTILS_ON_SL7_X.NASL
    descriptionSecurity Fix(es) : - policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead (CVE-2018-1063) This issue was discovered by Renaud Mtrich (Red Hat). Additional Changes :
    last seen2020-03-18
    modified2018-05-01
    plugin id109457
    published2018-05-01
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109457
    titleScientific Linux Security Update : policycoreutils on SL7.x x86_64 (20180410)
  • NASL familyCentOS Local Security Checks
    NASL idCENTOS_RHSA-2018-0913.NASL
    descriptionAn update for policycoreutils is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Low. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link (s) in the References section. The policycoreutils packages contain the core policy utilities required to manage a SELinux environment. Security Fix(es) : * policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead (CVE-2018-1063) For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section. This issue was discovered by Renaud Metrich (Red Hat). Additional Changes : For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.5 Release Notes linked from the References section.
    last seen2020-06-01
    modified2020-06-02
    plugin id109377
    published2018-04-27
    reporterThis script is Copyright (C) 2018-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109377
    titleCentOS 7 : policycoreutils (CESA-2018:0913)
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-362.NASL
    descriptionThis update for policycoreutils fixes the following issues : - CVE-2018-1063: Fixed problem to prevent chcon from following symlinks in /tmp, /var/tmp, /var/run and /var/lib/debug (bsc#1083624). This update was imported from the SUSE:SLE-12-SP2:Update update project.
    last seen2020-06-05
    modified2018-04-13
    plugin id109023
    published2018-04-13
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/109023
    titleopenSUSE Security Update : policycoreutils (openSUSE-2018-362)

Redhat

advisories
bugzilla
id1550122
titleCVE-2018-1063 policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead
oval
OR
  • commentRed Hat Enterprise Linux must be installed
    ovaloval:com.redhat.rhba:tst:20070304026
  • AND
    • commentRed Hat Enterprise Linux 7 is installed
      ovaloval:com.redhat.rhba:tst:20150364027
    • OR
      • AND
        • commentpolicycoreutils is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913001
        • commentpolicycoreutils is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20110414020
      • AND
        • commentpolicycoreutils-sandbox is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913003
        • commentpolicycoreutils-sandbox is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20110414014
      • AND
        • commentpolicycoreutils-devel is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913005
        • commentpolicycoreutils-devel is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20162702016
      • AND
        • commentpolicycoreutils-gui is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913007
        • commentpolicycoreutils-gui is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20110414012
      • AND
        • commentpolicycoreutils-restorecond is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913009
        • commentpolicycoreutils-restorecond is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20162702013
      • AND
        • commentpolicycoreutils-newrole is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913011
        • commentpolicycoreutils-newrole is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20110414016
      • AND
        • commentpolicycoreutils-python is earlier than 0:2.5-22.el7
          ovaloval:com.redhat.rhsa:tst:20180913013
        • commentpolicycoreutils-python is signed with Red Hat redhatrelease2 key
          ovaloval:com.redhat.rhsa:tst:20110414018
rhsa
idRHSA-2018:0913
released2018-04-10
severityLow
titleRHSA-2018:0913: policycoreutils security, bug fix, and enhancement update (Low)
rpms
  • policycoreutils-0:2.5-22.el7
  • policycoreutils-debuginfo-0:2.5-22.el7
  • policycoreutils-devel-0:2.5-22.el7
  • policycoreutils-gui-0:2.5-22.el7
  • policycoreutils-newrole-0:2.5-22.el7
  • policycoreutils-python-0:2.5-22.el7
  • policycoreutils-restorecond-0:2.5-22.el7
  • policycoreutils-sandbox-0:2.5-22.el7

References