SUSE SLES11 Security Update : libxml2 (SUSE-SU-2016:1205-1)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from SUSE update advisory SUSE-SU-2016:1205-1.
# The text itself is copyright (C) SUSE.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if (description)
{
  script_id(90886);
  script_version("2.12");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2016-3627");

  script_name(english:"SUSE SLES11 Security Update : libxml2 (SUSE-SU-2016:1205-1)");
  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 two security issues :

  - libxml2 limits the number of recursions an XML document
    can contain so to protect against the 'Billion Laughs'
    denial-of-service attack. Unfortunately, the underlying
    counter was not incremented properly in all necessary
    locations. Therefore, specially crafted XML documents
    could exhaust all available stack space and crash the
    XML parser without running into the recursion limit.
    This vulnerability has been fixed. (bsc#975947)

  - When running in recovery mode, certain invalid XML
    documents would trigger an infinite recursion in libxml2
    that ran until all stack space was exhausted. This
    vulnerability could have been used to facilitate a
    denial-of-sevice attack. (CVE-2016-3627, bsc#972335)

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=972335"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://bugzilla.suse.com/show_bug.cgi?id=975947"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.suse.com/security/cve/CVE-2016-3627/"
  );
  # https://www.suse.com/support/update/announcement/2016/suse-su-20161205-1/
  script_set_attribute(
    attribute:"see_also",
    value:"http://www.nessus.org/u?3c0bd963"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"To install this SUSE Security Update use YaST online_update.
Alternatively you can run the command listed for your product :

SUSE Linux Enterprise Software Development Kit 11-SP4 :

zypper in -t patch sdksp4-libxml2-12538=1

SUSE Linux Enterprise Server 11-SP4 :

zypper in -t patch slessp4-libxml2-12538=1

SUSE Linux Enterprise Debuginfo 11-SP4 :

zypper in -t patch dbgsp4-libxml2-12538=1

To bring your system up-to-date, use 'zypper patch'."
  );
  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:novell:suse_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:novell:suse_linux:libxml2-python");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:novell:suse_linux:11");

  script_set_attribute(attribute:"vuln_publication_date", value:"2016/05/17");
  script_set_attribute(attribute:"patch_publication_date", value:"2016/05/03");
  script_set_attribute(attribute:"plugin_publication_date", value:"2016/05/04");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2016-2021 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", cpu:"x86_64", reference:"libxml2-32bit-2.7.6-0.40.1")) flag++;
if (rpm_check(release:"SLES11", sp:"4", cpu:"s390x", reference:"libxml2-32bit-2.7.6-0.40.1")) flag++;
if (rpm_check(release:"SLES11", sp:"4", reference:"libxml2-2.7.6-0.40.1")) flag++;
if (rpm_check(release:"SLES11", sp:"4", reference:"libxml2-doc-2.7.6-0.40.1")) flag++;
if (rpm_check(release:"SLES11", sp:"4", reference:"libxml2-python-2.7.6-0.40.3")) 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");
}