Debian DSA-2784-1 : xorg-server - use-after-free

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were  
# extracted from Debian Security Advisory DSA-2784. The text 
# itself is copyright (C) Software in the Public Interest, Inc.
#

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

if (description)
{
  script_id(70548);
  script_version("1.8");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");

  script_cve_id("CVE-2013-4396");
  script_bugtraq_id(62892);
  script_xref(name:"DSA", value:"2784");

  script_name(english:"Debian DSA-2784-1 : xorg-server - use-after-free");
  script_summary(english:"Checks dpkg output for the updated package");

  script_set_attribute(
    attribute:"synopsis", 
    value:"The remote Debian host is missing a security-related update."
  );
  script_set_attribute(
    attribute:"description", 
    value:
"Pedro Ribeiro discovered a use-after-free in the handling of ImageText
requests in the Xorg Xserver, which could result in denial of service
or privilege escalation."
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/squeeze/xorg-server"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://packages.debian.org/source/wheezy/xorg-server"
  );
  script_set_attribute(
    attribute:"see_also",
    value:"https://www.debian.org/security/2013/dsa-2784"
  );
  script_set_attribute(
    attribute:"solution", 
    value:
"Upgrade the xorg-server packages.

For the oldstable distribution (squeeze), this problem has been fixed
in version 1.7.7-17.

For the stable distribution (wheezy), this problem has been fixed in
version 1.12.4-6+deb7u1."
  );
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:S/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/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:debian:debian_linux:xorg-server");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:6.0");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:7.0");

  script_set_attribute(attribute:"patch_publication_date", value:"2013/10/22");
  script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/23");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_copyright(english:"This script is Copyright (C) 2013-2021 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:"6.0", prefix:"xdmx", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xdmx-tools", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xnest", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-common", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xephyr", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xfbdev", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xorg-core", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xorg-core-dbg", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xorg-core-udeb", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xserver-xorg-dev", reference:"1.7.7-17")) flag++;
if (deb_check(release:"6.0", prefix:"xvfb", reference:"1.7.7-17")) flag++;
if (deb_check(release:"7.0", prefix:"xdmx", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xdmx-tools", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xnest", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-common", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xephyr", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xfbdev", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xorg-core", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xorg-core-dbg", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xorg-core-udeb", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xserver-xorg-dev", reference:"1.12.4-6+deb7u1")) flag++;
if (deb_check(release:"7.0", prefix:"xvfb", reference:"1.12.4-6+deb7u1")) 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");