RHEL 6 : libxml2 (RHSA-2011:1749)

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Red Hat Security Advisory RHSA-2011:1749. The text 
# itself is copyright (C) Red Hat, Inc.
#

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

if (description)
{
  script_id(57022);
  script_version("1.24");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/14");

  script_cve_id("CVE-2010-4008", "CVE-2010-4494", "CVE-2011-0216", "CVE-2011-1944", "CVE-2011-2821", "CVE-2011-2834");
  script_bugtraq_id(44779, 45617, 48056, 48832, 49279, 49658);
  script_xref(name:"RHSA", value:"2011:1749");

  script_name(english:"RHEL 6 : libxml2 (RHSA-2011:1749)");
  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:
"Updated libxml2 packages that fix several security issues and various
bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having low
security impact. Common Vulnerability Scoring System (CVSS) base
scores, which give detailed severity ratings, are available for each
vulnerability from the CVE links in the References section.

The libxml2 library is a development toolbox providing the
implementation of various XML standards. One of those standards is the
XML Path Language (XPath), which is a language for addressing parts of
an XML document.

An off-by-one error, leading to a heap-based buffer overflow, was
found in the way libxml2 parsed certain XML files. A remote attacker
could provide a specially crafted XML file that, when opened in an
application linked against libxml2, would cause the application to
crash or, potentially, execute arbitrary code with the privileges of
the user running the application. (CVE-2011-0216)

An integer overflow flaw, leading to a heap-based buffer overflow, was
found in the way libxml2 parsed certain XPath expressions. If an
attacker were able to supply a specially crafted XML file to an
application using libxml2, as well as an XPath expression for that
application to run against the crafted file, it could cause the
application to crash or, possibly, execute arbitrary code.
(CVE-2011-1944)

Multiple flaws were found in the way libxml2 parsed certain XPath
expressions. If an attacker were able to supply a specially crafted
XML file to an application using libxml2, as well as an XPath
expression for that application to run against the crafted file, it
could cause the application to crash. (CVE-2010-4008, CVE-2010-4494,
CVE-2011-2821, CVE-2011-2834)

Note: Red Hat does not ship any applications that use libxml2 in a way
that would allow the CVE-2011-1944, CVE-2010-4008, CVE-2010-4494,
CVE-2011-2821, and CVE-2011-2834 flaws to be exploited; however,
third-party applications may allow XPath expressions to be passed
which could trigger these flaws.

Red Hat would like to thank the Google Security Team for reporting the
CVE-2010-4008 issue. Upstream acknowledges Bui Quang Minh from Bkis as
the original reporter of CVE-2010-4008.

This update also fixes the following bugs :

* A number of patches have been applied to harden the XPath processing
code in libxml2, such as fixing memory leaks, rounding errors, XPath
numbers evaluations, and a potential error in encoding conversion.
(BZ#732335)

All users of libxml2 are advised to upgrade to these updated packages,
which contain backported patches to correct these issues. The desktop
must be restarted (log out, then log back in) for this update to take
effect."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2010-4008"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2010-4494"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2011-0216"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2011-1944"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2011-2821"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/security/cve/cve-2011-2834"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://access.redhat.com/errata/RHSA-2011:1749"
  );
  script_set_attribute(attribute:"solution", value:"Update the affected packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C");
  script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
  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:redhat:enterprise_linux:libxml2");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-debuginfo");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-python");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:libxml2-static");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:6");

  script_set_attribute(attribute:"vuln_publication_date", value:"2010/11/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2011/12/06");
  script_set_attribute(attribute:"plugin_publication_date", value:"2011/12/06");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2011-2021 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:"^6([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Red Hat 6.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-2011:1749";
  yum_report = redhat_generate_yum_updateinfo_report(rhsa:rhsa);
  if (!empty_or_null(yum_report))
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      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:"RHEL6", reference:"libxml2-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"libxml2-debuginfo-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", reference:"libxml2-devel-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"libxml2-python-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"libxml2-python-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"libxml2-python-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"i686", reference:"libxml2-static-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"s390x", reference:"libxml2-static-2.7.6-4.el6")) flag++;
  if (rpm_check(release:"RHEL6", cpu:"x86_64", reference:"libxml2-static-2.7.6-4.el6")) flag++;

  if (flag)
  {
    security_report_v4(
      port       : 0,
      severity   : SECURITY_HOLE,
      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, "libxml2 / libxml2-debuginfo / libxml2-devel / libxml2-python / etc");
  }
}