Vulnerabilities > CVE-2018-18023 - Out-of-bounds Read vulnerability in Imagemagick 7.0.813

047910
CVSS 6.5 - MEDIUM
Attack vector
NETWORK
Attack complexity
LOW
Privileges required
NONE
Confidentiality impact
NONE
Integrity impact
NONE
Availability impact
HIGH
network
low complexity
imagemagick
CWE-125
nessus
NVD
Published: 2018-10-07
Updated: 2019-06-25

Summary

In ImageMagick 7.0.8-13 Q16, there is a heap-based buffer over-read in the SVGStripString function of coders/svg.c, which allows attackers to cause a denial of service via a crafted SVG image file.

Vulnerable Configurations

Part Description Count
Application
Imagemagick
1

Common Weakness Enumeration (CWE)

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Overread Buffers
    An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.

Nessus

NASL familyUbuntu Local Security Checks
NASL idUBUNTU_USN-4034-1.NASL
descriptionIt was discovered that ImageMagick incorrectly handled certain malformed image files. If a user or automated system using ImageMagick were tricked into opening a specially crafted image, an attacker could exploit this to cause a denial of service or possibly execute code with the privileges of the user invoking the program. Due to a large number of issues discovered in GhostScript that prevent it from being used by ImageMagick safely, the update for Ubuntu 18.10 and Ubuntu 19.04 includes a default policy change that disables support for the Postscript and PDF formats in ImageMagick. This policy can be overridden if necessary by using an alternate ImageMagick policy configuration. Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu 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 id126254
published2019-06-26
reporterUbuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.
sourcehttps://www.tenable.com/plugins/nessus/126254
titleUbuntu 16.04 LTS / 18.04 LTS / 18.10 / 19.04 : imagemagick vulnerabilities (USN-4034-1)
code
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-4034-1. The text 
# itself is copyright (C) Canonical, Inc. See 
# <http://www.ubuntu.com/usn/>. Ubuntu(R) is a registered 
# trademark of Canonical, Inc.
#

include("compat.inc");

if (description)
{
  script_id(126254);
  script_version("1.4");
  script_cvs_date("Date: 2020/01/10");

  script_cve_id("CVE-2017-12805", "CVE-2017-12806", "CVE-2018-14434", "CVE-2018-15607", "CVE-2018-16323", "CVE-2018-16412", "CVE-2018-16413", "CVE-2018-16644", "CVE-2018-16645", "CVE-2018-17965", "CVE-2018-17966", "CVE-2018-18016", "CVE-2018-18023", "CVE-2018-18024", "CVE-2018-18025", "CVE-2018-18544", "CVE-2018-20467", "CVE-2019-10131", "CVE-2019-10649", "CVE-2019-10650", "CVE-2019-11470", "CVE-2019-11472", "CVE-2019-11597", "CVE-2019-11598", "CVE-2019-7175", "CVE-2019-7395", "CVE-2019-7396", "CVE-2019-7397", "CVE-2019-7398", "CVE-2019-9956");
  script_xref(name:"USN", value:"4034-1");

  script_name(english:"Ubuntu 16.04 LTS / 18.04 LTS / 18.10 / 19.04 : imagemagick vulnerabilities (USN-4034-1)");
  script_summary(english:"Checks dpkg output for updated packages.");

  script_set_attribute(
    attribute:"synopsis", 
    value:
"The remote Ubuntu host is missing one or more security-related
patches."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"It was discovered that ImageMagick incorrectly handled certain
malformed image files. If a user or automated system using ImageMagick
were tricked into opening a specially crafted image, an attacker could
exploit this to cause a denial of service or possibly execute code
with the privileges of the user invoking the program.

Due to a large number of issues discovered in GhostScript that prevent
it from being used by ImageMagick safely, the update for Ubuntu 18.10
and Ubuntu 19.04 includes a default policy change that disables
support for the Postscript and PDF formats in ImageMagick. This policy
can be overridden if necessary by using an alternate ImageMagick
policy configuration.

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu 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://usn.ubuntu.com/4034-1/"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected 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:POC/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:P/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2019-9956");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:imagemagick");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:imagemagick-6.q16");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagick++-6.q16-5v5");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagick++-6.q16-7");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagick++-6.q16-8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-2-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-3");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-3-extra");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-6");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libmagickcore-6.q16-6-extra");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:19.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2018/07/20");
  script_set_attribute(attribute:"patch_publication_date", value:"2019/06/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2019/06/26");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2019-2020 Canonical, Inc. / NASL script (C) 2019-2020 and is owned by Tenable, Inc. or an Affiliate thereof.");
  script_family(english:"Ubuntu Local Security Checks");

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

  exit(0);
}


include("audit.inc");
include("ubuntu.inc");
include("misc_func.inc");

if ( ! get_kb_item("Host/local_checks_enabled") ) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
release = get_kb_item("Host/Ubuntu/release");
if ( isnull(release) ) audit(AUDIT_OS_NOT, "Ubuntu");
release = chomp(release);
if (! preg(pattern:"^(16\.04|18\.04|18\.10|19\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 16.04 / 18.04 / 18.10 / 19.04", "Ubuntu " + release);
if ( ! get_kb_item("Host/Debian/dpkg-l") ) 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, "Ubuntu", cpu);

flag = 0;

if (ubuntu_check(osver:"16.04", pkgname:"imagemagick", pkgver:"8:6.8.9.9-7ubuntu5.14")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"imagemagick-6.q16", pkgver:"8:6.8.9.9-7ubuntu5.14")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libmagick++-6.q16-5v5", pkgver:"8:6.8.9.9-7ubuntu5.14")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libmagickcore-6.q16-2", pkgver:"8:6.8.9.9-7ubuntu5.14")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libmagickcore-6.q16-2-extra", pkgver:"8:6.8.9.9-7ubuntu5.14")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"imagemagick", pkgver:"8:6.9.7.4+dfsg-16ubuntu6.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"imagemagick-6.q16", pkgver:"8:6.9.7.4+dfsg-16ubuntu6.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libmagick++-6.q16-7", pkgver:"8:6.9.7.4+dfsg-16ubuntu6.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libmagickcore-6.q16-3", pkgver:"8:6.9.7.4+dfsg-16ubuntu6.7")) flag++;
if (ubuntu_check(osver:"18.04", pkgname:"libmagickcore-6.q16-3-extra", pkgver:"8:6.9.7.4+dfsg-16ubuntu6.7")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"imagemagick", pkgver:"8:6.9.10.8+dfsg-1ubuntu2.2")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"imagemagick-6.q16", pkgver:"8:6.9.10.8+dfsg-1ubuntu2.2")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"libmagick++-6.q16-8", pkgver:"8:6.9.10.8+dfsg-1ubuntu2.2")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"libmagickcore-6.q16-6", pkgver:"8:6.9.10.8+dfsg-1ubuntu2.2")) flag++;
if (ubuntu_check(osver:"18.10", pkgname:"libmagickcore-6.q16-6-extra", pkgver:"8:6.9.10.8+dfsg-1ubuntu2.2")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"imagemagick", pkgver:"8:6.9.10.14+dfsg-7ubuntu2.2")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"imagemagick-6.q16", pkgver:"8:6.9.10.14+dfsg-7ubuntu2.2")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"libmagick++-6.q16-8", pkgver:"8:6.9.10.14+dfsg-7ubuntu2.2")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"libmagickcore-6.q16-6", pkgver:"8:6.9.10.14+dfsg-7ubuntu2.2")) flag++;
if (ubuntu_check(osver:"19.04", pkgname:"libmagickcore-6.q16-6-extra", pkgver:"8:6.9.10.14+dfsg-7ubuntu2.2")) flag++;

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : ubuntu_report_get()
  );
  exit(0);
}
else
{
  tested = ubuntu_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, "imagemagick / imagemagick-6.q16 / libmagick++-6.q16-5v5 / etc");
}

References