CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
AV:L/AC:M/Au:N/C:P/I:N/A:N
EPSS
Percentile
5.1%
A flaw was found in the way the X.Org server handled lock files. A local user with access to the system console could use this flaw to determine the existence of a file in a directory not accessible to the user, via a symbolic link attack. (CVE-2011-4028)
A race condition was found in the way the X.Org server managed temporary lock files. A local attacker could use this flaw to perform a symbolic link attack, allowing them to make an arbitrary file world readable, leading to the disclosure of sensitive information.
(CVE-2011-4029)
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux AMI Security Advisory ALAS-2012-104.
#
include("compat.inc");
if (description)
{
script_id(69594);
script_version("1.5");
script_cvs_date("Date: 2018/04/18 15:09:34");
script_cve_id("CVE-2011-4028", "CVE-2011-4029");
script_xref(name:"ALAS", value:"2012-104");
script_xref(name:"RHSA", value:"2012:0939");
script_name(english:"Amazon Linux AMI : xorg-x11-server (ALAS-2012-104)");
script_summary(english:"Checks rpm output for the updated packages");
script_set_attribute(
attribute:"synopsis",
value:"The remote Amazon Linux AMI host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"A flaw was found in the way the X.Org server handled lock files. A
local user with access to the system console could use this flaw to
determine the existence of a file in a directory not accessible to the
user, via a symbolic link attack. (CVE-2011-4028)
A race condition was found in the way the X.Org server managed
temporary lock files. A local attacker could use this flaw to perform
a symbolic link attack, allowing them to make an arbitrary file world
readable, leading to the disclosure of sensitive information.
(CVE-2011-4029)"
);
script_set_attribute(
attribute:"see_also",
value:"https://alas.aws.amazon.com/ALAS-2012-104.html"
);
script_set_attribute(
attribute:"solution",
value:"Run 'yum update xorg-x11-server' to update your system."
);
script_set_cvss_base_vector("CVSS2#AV:L/AC:M/Au:N/C:P/I:N/A:N");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-Xephyr");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-Xnest");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-Xvfb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-common");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-debuginfo");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-source");
script_set_attribute(attribute:"cpe", value:"cpe:/o:amazon:linux");
script_set_attribute(attribute:"patch_publication_date", value:"2012/07/05");
script_set_attribute(attribute:"plugin_publication_date", value:"2013/09/04");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2013-2018 Tenable Network Security, Inc.");
script_family(english:"Amazon Linux Local Security Checks");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/AmazonLinux/release", "Host/AmazonLinux/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/AmazonLinux/release");
if (isnull(release) || !strlen(release)) audit(AUDIT_OS_NOT, "Amazon Linux");
os_ver = pregmatch(pattern: "^AL(A|\d)", string:release);
if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Amazon Linux");
os_ver = os_ver[1];
if (os_ver != "A")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux AMI", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
flag = 0;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-Xephyr-1.10.6-1.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-Xnest-1.10.6-1.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-Xvfb-1.10.6-1.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-common-1.10.6-1.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-debuginfo-1.10.6-1.12.amzn1")) flag++;
if (rpm_check(release:"ALA", reference:"xorg-x11-server-source-1.10.6-1.12.amzn1")) flag++;
if (flag)
{
if (report_verbosity > 0) security_note(port:0, extra:rpm_report_get());
else security_note(0);
exit(0);
}
else
{
tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "xorg-x11-server-Xephyr / xorg-x11-server-Xnest / etc");
}