CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
SINGLE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:S/C:P/I:P/A:P
EPSS
Percentile
90.8%
Updated xorg-x11-server packages that fix one security issue are now available for Red Hat Enterprise Linux 5 and 6.
The Red Hat Security Response Team has rated this update as having important security impact. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available from the CVE link in the References section.
X.Org is an open source implementation of the X Window System. It provides the basic low-level functionality that full-fledged graphical user interfaces are designed upon.
A use-after-free flaw was found in the way the X.Org server handled ImageText requests. A malicious, authorized client could use this flaw to crash the X.Org server or, potentially, execute arbitrary code with root privileges. (CVE-2013-4396)
Red Hat would like to thank the X.Org security team for reporting this issue. Upstream acknowledges Pedro Ribeiro as the original reporter.
All xorg-x11-server users are advised to upgrade to these updated packages, which contain a backported patch to correct this issue.
#%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-2013:1426 and
# CentOS Errata and Security Advisory 2013:1426 respectively.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(70464);
script_version("1.11");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/04");
script_cve_id("CVE-2013-4396");
script_bugtraq_id(62892);
script_xref(name:"RHSA", value:"2013:1426");
script_name(english:"CentOS 5 / 6 : xorg-x11-server (CESA-2013:1426)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote CentOS host is missing one or more security updates."
);
script_set_attribute(
attribute:"description",
value:
"Updated xorg-x11-server packages that fix one security issue are now
available for Red Hat Enterprise Linux 5 and 6.
The Red Hat Security Response Team has rated this update as having
important security impact. A Common Vulnerability Scoring System
(CVSS) base score, which gives a detailed severity rating, is
available from the CVE link in the References section.
X.Org is an open source implementation of the X Window System. It
provides the basic low-level functionality that full-fledged graphical
user interfaces are designed upon.
A use-after-free flaw was found in the way the X.Org server handled
ImageText requests. A malicious, authorized client could use this flaw
to crash the X.Org server or, potentially, execute arbitrary code with
root privileges. (CVE-2013-4396)
Red Hat would like to thank the X.Org security team for reporting this
issue. Upstream acknowledges Pedro Ribeiro as the original reporter.
All xorg-x11-server users are advised to upgrade to these updated
packages, which contain a backported patch to correct this issue."
);
# https://lists.centos.org/pipermail/centos-announce/2013-October/019973.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?c5a7512a"
);
# https://lists.centos.org/pipermail/centos-cr-announce/2013-October/000892.html
script_set_attribute(
attribute:"see_also",
value:"http://www.nessus.org/u?a9574378"
);
script_set_attribute(
attribute:"solution",
value:"Update the affected xorg-x11-server packages."
);
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:"cvss_score_source", value:"CVE-2013-4396");
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:centos:centos:xorg-x11-server-Xdmx");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xephyr");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xnest");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xorg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xvfb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-Xvnc-source");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-devel");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-sdk");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:xorg-x11-server-source");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:5");
script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:6");
script_set_attribute(attribute:"vuln_publication_date", value:"2013/10/10");
script_set_attribute(attribute:"patch_publication_date", value:"2013/10/16");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/10/17");
script_set_attribute(attribute:"generated_plugin", value:"current");
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:"CentOS Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/CentOS/release", "Host/CentOS/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/CentOS/release");
if (isnull(release) || "CentOS" >!< release) audit(AUDIT_OS_NOT, "CentOS");
os_ver = pregmatch(pattern: "CentOS(?: Linux)? release ([0-9]+)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "CentOS");
os_ver = os_ver[1];
if (! preg(pattern:"^(5|6)([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "CentOS 5.x / 6.x", "CentOS " + os_ver);
if (!get_kb_item("Host/CentOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "CentOS", cpu);
flag = 0;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xdmx-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xephyr-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xnest-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xorg-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xvfb-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-Xvnc-source-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-5", reference:"xorg-x11-server-sdk-1.1.1-48.101.el5_10.1")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-Xdmx-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-Xephyr-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-Xnest-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-Xorg-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-Xvfb-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-common-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-devel-1.13.0-11.1.el6.centos.2")) flag++;
if (rpm_check(release:"CentOS-6", reference:"xorg-x11-server-source-1.13.0-11.1.el6.centos.2")) flag++;
if (flag)
{
cr_plugin_caveat = '\n' +
'NOTE: The security advisory associated with this vulnerability has a\n' +
'fixed package version that may only be available in the continuous\n' +
'release (CR) repository for CentOS, until it is present in the next\n' +
'point release of CentOS.\n\n' +
'If an equal or higher package level does not exist in the baseline\n' +
'repository for your major version of CentOS, then updates from the CR\n' +
'repository will need to be applied in order to address the\n' +
'vulnerability.\n';
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get() + cr_plugin_caveat
);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xorg-x11-server-Xdmx / xorg-x11-server-Xephyr / etc");
}