Vulnerabilities > CVE-2018-1000637 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
nongnu
debian
CWE-119
nessus
NVD
Published: 2018-08-20
Updated: 2018-11-02

Summary

zutils version prior to version 1.8-pre2 contains a Buffer Overflow vulnerability in zcat that can result in Potential denial of service or arbitrary code execution. This attack appear to be exploitable via the victim openning a crafted compressed file. This vulnerability appears to have been fixed in 1.8-pre2.

Vulnerable Configurations

Part Description Count
Application
Nongnu
20
OS
Debian
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyDebian Local Security Checks
    NASL idDEBIAN_DLA-1505.NASL
    descriptionzutils version prior to version 1.8-pre2 contains a buffer overflow vulnerability in zcat which happened with some input files when the
    last seen2020-06-01
    modified2020-06-02
    plugin id117501
    published2018-09-17
    reporterThis script is Copyright (C) 2018 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/117501
    titleDebian DLA-1505-1 : zutils security update
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1505-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include("compat.inc");

if (description)
{
  script_id(117501);
  script_version("1.2");
  script_cvs_date("Date: 2018/11/05  9:50:12");

  script_cve_id("CVE-2018-1000637");

  script_name(english:"Debian DLA-1505-1 : zutils security update");
  script_summary(english:"Checks dpkg output for the updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"zutils version prior to version 1.8-pre2 contains a buffer overflow
vulnerability in zcat which happened with some input files when the
'-v, --show-nonprinting' option was used (or indirectly enabled). This
can result in potential denial of service or arbitrary code execution.
This attack appear is exploitable via the victim openning a crafted
compressed file and has been fixed in 1.8-pre2.

For Debian 8 'Jessie', this problem has been fixed in version
1.3-4+deb8u1.

We recommend that you upgrade your zutils packages.

NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA 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://lists.debian.org/debian-lts-announce/2018/09/msg00016.html"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/jessie/zutils"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Upgrade the affected zutils, and zutils-dbg packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:zutils-dbg");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/17");
  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:"Debian Local Security Checks");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}


include("audit.inc");
include("debian_package.inc");


if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/release")) audit(AUDIT_OS_NOT, "Debian");
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);


flag = 0;
if (deb_check(release:"8.0", prefix:"zutils", reference:"1.3-4+deb8u1")) flag++;
if (deb_check(release:"8.0", prefix:"zutils-dbg", reference:"1.3-4+deb8u1")) flag++;

if (flag)
{
  if (report_verbosity > 0) security_warning(port:0, extra:deb_report_get());
  else security_warning(0);
  exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2019-654.NASL
    descriptionThis update for zutils to version 1.7 fixes one security issue : - CVE-2018-1000637: buffer overrun in zcat utility (boo#1103878) Please note that the zutils zcat utility is distinct from the default gzip zcat utility.
    last seen2020-05-31
    modified2019-03-27
    plugin id123283
    published2019-03-27
    reporterThis script is Copyright (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/123283
    titleopenSUSE Security Update : zutils (openSUSE-2019-654)
    code
    #
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2019-654.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(123283);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/05/26");

  script_cve_id("CVE-2018-1000637");

  script_name(english:"openSUSE Security Update : zutils (openSUSE-2019-654)");
  script_summary(english:"Check for the openSUSE-2019-654 patch");

  script_set_attribute(
    attribute:"synopsis",
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description",
    value:
"This update for zutils to version 1.7 fixes one security issue :

  - CVE-2018-1000637: buffer overrun in zcat utility
    (boo#1103878)

Please note that the zutils zcat utility is distinct from the default
gzip zcat utility."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1103878"
  );
  script_set_attribute(
    attribute:"solution",
    value:"Update the affected zutils 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:L/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:"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:novell:opensuse:zutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:zutils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:zutils-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/08/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/03/23");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/03/27");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2019-2020 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/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  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, "openSUSE");
if (release !~ "^(SUSE15\.0)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.0", reference:"zutils-1.7-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"zutils-debuginfo-1.7-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"zutils-debugsource-1.7-lp150.2.3.1") ) 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, "zutils / zutils-debuginfo / zutils-debugsource");
}
  • NASL familySuSE Local Security Checks
    NASL idOPENSUSE-2018-951.NASL
    descriptionThis update for zutils to version 1.7 fixes one security issue : - CVE-2018-1000637: buffer overrun in zcat utility (boo#1103878) Please note that the zutils zcat utility is distinct from the default gzip zcat utility.
    last seen2020-06-05
    modified2018-09-04
    plugin id112265
    published2018-09-04
    reporterThis script is Copyright (C) 2018-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/112265
    titleopenSUSE Security Update : zutils (openSUSE-2018-951)
    code
    #%NASL_MIN_LEVEL 80502
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from openSUSE Security Update openSUSE-2018-951.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(112265);
  script_version("1.3");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2018-1000637");

  script_name(english:"openSUSE Security Update : zutils (openSUSE-2018-951)");
  script_summary(english:"Check for the openSUSE-2018-951 patch");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote openSUSE host is missing a security update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"This update for zutils to version 1.7 fixes one security issue :

  - CVE-2018-1000637: buffer overrun in zcat utility
    (boo#1103878)

Please note that the zutils zcat utility is distinct from the default
gzip zcat utility."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=1103878"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected zutils packages."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:zutils");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:zutils-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:zutils-debugsource");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:15.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:42.3");

  script_set_attribute(attribute:"patch_publication_date", value:"2018/09/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2018/09/04");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2018-2020 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/SuSE/release", "Host/SuSE/rpm-list", "Host/cpu");

  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, "openSUSE");
if (release !~ "^(SUSE15\.0|SUSE42\.3)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "15.0 / 42.3", release);
if (!get_kb_item("Host/SuSE/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);

ourarch = get_kb_item("Host/cpu");
if (!ourarch) audit(AUDIT_UNKNOWN_ARCH);
if (ourarch !~ "^(x86_64)$") audit(AUDIT_ARCH_NOT, "x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE15.0", reference:"zutils-1.7-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"zutils-debuginfo-1.7-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE15.0", reference:"zutils-debugsource-1.7-lp150.2.3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"zutils-1.7-4.3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"zutils-debuginfo-1.7-4.3.1") ) flag++;
if ( rpm_check(release:"SUSE42.3", reference:"zutils-debugsource-1.7-4.3.1") ) 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, "zutils / zutils-debuginfo / zutils-debugsource");
}

References