Vulnerabilities > CVE-2016-4356 - Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in multiple products

#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Ubuntu Security Notice USN-2982-1. 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(91220);
  script_version("2.11");
  script_cvs_date("Date: 2019/09/18 12:31:45");

  script_cve_id("CVE-2016-4353", "CVE-2016-4354", "CVE-2016-4355", "CVE-2016-4356", "CVE-2016-4574", "CVE-2016-4579");
  script_xref(name:"USN", value:"2982-1");

  script_name(english:"Ubuntu 12.04 LTS / 14.04 LTS / 15.10 / 16.04 LTS : libksba vulnerabilities (USN-2982-1)");
  script_summary(english:"Checks dpkg output for updated package.");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Ubuntu host is missing a security-related patch."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Hanno Bock discovered that Libksba incorrectly handled decoding
certain BER data. An attacker could use this issue to cause Libksba to
crash, resulting in a denial of service. This issue only applied to
Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4353)

Hanno Bock discovered that Libksba incorrectly handled decoding
certain BER data. An attacker could use this issue to cause Libksba to
crash, resulting in a denial of service, or possibly execute arbitrary
code. This issue only applied to Ubunt 12.04 LTS and Ubuntu 14.04 LTS.
(CVE-2016-4354, CVE-2016-4355)

Hanno Bock discovered that Libksba incorrectly handled incorrect
utf-8 strings when decoding certain DN data. An attacker could use
this issue to cause Libksba to crash, resulting in a denial of
service, or possibly execute arbitrary code. This issue only applied
to Ubunt 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2016-4356)

Pascal Cuoq discovered that Libksba incorrectly handled incorrect
utf-8 strings when decoding certain DN data. An attacker could use
this issue to cause Libksba to crash, resulting in a denial of
service, or possibly execute arbitrary code. (CVE-2016-4574)

Pascal Cuoq discovered that Libksba incorrectly handled decoding
certain data. An attacker could use this issue to cause Libksba to
crash, resulting in a denial of service. (CVE-2016-4579).

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/2982-1/"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libksba8 package."
  );
  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:"exploit_available", value:"false");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:canonical:ubuntu_linux:libksba8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:12.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:15.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/06/13");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/17");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/18");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"Ubuntu Security Notice (C) 2016-2019 Canonical, Inc. / NASL script (C) 2016-2019 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:"^(12\.04|14\.04|15\.10|16\.04)$", string:release)) audit(AUDIT_OS_NOT, "Ubuntu 12.04 / 14.04 / 15.10 / 16.04", "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:"12.04", pkgname:"libksba8", pkgver:"1.2.0-2ubuntu0.2")) flag++;
if (ubuntu_check(osver:"14.04", pkgname:"libksba8", pkgver:"1.3.0-3ubuntu0.14.04.2")) flag++;
if (ubuntu_check(osver:"15.10", pkgname:"libksba8", pkgver:"1.3.3-1ubuntu0.15.10.1")) flag++;
if (ubuntu_check(osver:"16.04", pkgname:"libksba8", pkgver:"1.3.3-1ubuntu0.16.04.1")) 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, "libksba8");
}

#%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-2016-624.
#
# The text description of this plugin is (C) SUSE LLC.
#

include("compat.inc");

if (description)
{
  script_id(91289);
  script_version("2.4");
  script_set_attribute(attribute:"plugin_modification_date", value:"2020/06/04");

  script_cve_id("CVE-2016-4356", "CVE-2016-4574");

  script_name(english:"openSUSE Security Update : libksba (openSUSE-2016-624)");
  script_summary(english:"Check for the openSUSE-2016-624 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 libksba fixes the following issues :

Security issue fixed :

  - boo#979261: OOB read access bugs remote DoS

  - CVE-2016-4574: off-by-one OOB read access (incomplete
    fix for CVE-2016-4356)"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.opensuse.org/show_bug.cgi?id=979261"
  );
  script_set_attribute(
    attribute:"solution", 
    value:"Update the affected libksba packages."
  );
  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:opensuse:libksba-debugsource");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libksba-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libksba8");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:opensuse:libksba8-debuginfo");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:opensuse:13.2");

  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/20");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/23");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2020 Tenable Network Security, Inc.");
  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 !~ "^(SUSE13\.2)$") audit(AUDIT_OS_RELEASE_NOT, "openSUSE", "13.2", 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 !~ "^(i586|i686|x86_64)$") audit(AUDIT_ARCH_NOT, "i586 / i686 / x86_64", ourarch);

flag = 0;

if ( rpm_check(release:"SUSE13.2", reference:"libksba-debugsource-1.3.1-12.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"libksba-devel-1.3.1-12.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"libksba8-1.3.1-12.1") ) flag++;
if ( rpm_check(release:"SUSE13.2", reference:"libksba8-debuginfo-1.3.1-12.1") ) 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, "libksba-debugsource / libksba-devel / libksba8 / libksba8-debuginfo");
}