6.1 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:P/I:P/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
26.5%
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1592 advisory.
A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)
A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-14360)
A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability. (CVE-2020-25712)
Note that Nessus has not tested for this issue but has instead relied only on the application’s self-reported version number.
##
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Amazon Linux 2 Security Advisory ALAS-2021-1592.
##
include('compat.inc');
if (description)
{
script_id(145452);
script_version("1.3");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/26");
script_cve_id("CVE-2020-14347", "CVE-2020-14360", "CVE-2020-25712");
script_xref(name:"ALAS", value:"2021-1592");
script_name(english:"Amazon Linux 2 : xorg-x11-server (ALAS-2021-1592)");
script_set_attribute(attribute:"synopsis", value:
"The remote Amazon Linux 2 host is missing a security update.");
script_set_attribute(attribute:"description", value:
"It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2021-1592 advisory.
- A flaw was found in the way xserver memory was not properly initialized. This could leak parts of server
memory to the X client. In cases where Xorg server runs with elevated privileges, this could result in
possible ASLR bypass. Xorg-server before version 1.20.9 is vulnerable. (CVE-2020-14347)
- A flaw was found in the X.Org Server before version 1.20.10. An out-of-bounds access in the XkbSetMap
function may lead to a privilege escalation vulnerability. The highest threat from this vulnerability is
to data confidentiality and integrity as well as system availability. (CVE-2020-14360)
- A flaw was found in xorg-x11-server before 1.20.10. A heap-buffer overflow in XkbSetDeviceInfo may lead to
a privilege escalation vulnerability. The highest threat from this vulnerability is to data
confidentiality and integrity as well as system availability. (CVE-2020-25712)
Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version
number.");
script_set_attribute(attribute:"see_also", value:"https://alas.aws.amazon.com/AL2/ALAS-2021-1592.html");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-14347");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-14360");
script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/CVE-2020-25712");
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:L/Au:N/C:P/I:P/A:C");
script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2020-14360");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2020-25712");
script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
script_set_attribute(attribute:"exploit_available", value:"false");
script_set_attribute(attribute:"vuln_publication_date", value:"2020/08/05");
script_set_attribute(attribute:"patch_publication_date", value:"2021/01/25");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/01/26");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:amazon:linux:xorg-x11-server-Xdmx");
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-Xorg");
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-Xwayland");
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-devel");
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:2");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Amazon Linux Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2021-2024 and is owned by Tenable, Inc. or an Affiliate thereof.");
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 != "2")
{
if (os_ver == 'A') os_ver = 'AMI';
audit(AUDIT_OS_NOT, "Amazon Linux 2", "Amazon Linux " + os_ver);
}
if (!get_kb_item("Host/AmazonLinux/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
pkgs = [
{'reference':'xorg-x11-server-common-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-common-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-common-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-debuginfo-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-devel-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-devel-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-devel-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-source-1.20.4-15.amzn2.0.1', 'release':'AL2'},
{'reference':'xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xdmx-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xephyr-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xnest-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xnest-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xnest-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xorg-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xorg-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xorg-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xvfb-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.1', 'cpu':'aarch64', 'release':'AL2'},
{'reference':'xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.1', 'cpu':'i686', 'release':'AL2'},
{'reference':'xorg-x11-server-Xwayland-1.20.4-15.amzn2.0.1', 'cpu':'x86_64', 'release':'AL2'}
];
flag = 0;
foreach package_array ( pkgs ) {
reference = NULL;
release = NULL;
cpu = NULL;
el_string = NULL;
rpm_spec_vers_cmp = NULL;
allowmaj = NULL;
if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
if (!empty_or_null(package_array['release'])) release = package_array['release'];
if (!empty_or_null(package_array['cpu'])) cpu = package_array['cpu'];
if (!empty_or_null(package_array['el_string'])) el_string = package_array['el_string'];
if (!empty_or_null(package_array['rpm_spec_vers_cmp'])) rpm_spec_vers_cmp = package_array['rpm_spec_vers_cmp'];
if (!empty_or_null(package_array['allowmaj'])) allowmaj = package_array['allowmaj'];
if (reference && release) {
if (rpm_check(release:release, cpu:cpu, reference:reference, el_string:el_string, rpm_spec_vers_cmp:rpm_spec_vers_cmp, allowmaj:allowmaj)) flag++;
}
}
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
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 / xorg-x11-server-Xnest / etc");
}
Vendor | Product | Version | CPE |
---|---|---|---|
amazon | linux | xorg-x11-server-xdmx | p-cpe:/a:amazon:linux:xorg-x11-server-xdmx |
amazon | linux | xorg-x11-server-xephyr | p-cpe:/a:amazon:linux:xorg-x11-server-xephyr |
amazon | linux | xorg-x11-server-xnest | p-cpe:/a:amazon:linux:xorg-x11-server-xnest |
amazon | linux | xorg-x11-server-xorg | p-cpe:/a:amazon:linux:xorg-x11-server-xorg |
amazon | linux | xorg-x11-server-xvfb | p-cpe:/a:amazon:linux:xorg-x11-server-xvfb |
amazon | linux | xorg-x11-server-xwayland | p-cpe:/a:amazon:linux:xorg-x11-server-xwayland |
amazon | linux | xorg-x11-server-common | p-cpe:/a:amazon:linux:xorg-x11-server-common |
amazon | linux | xorg-x11-server-debuginfo | p-cpe:/a:amazon:linux:xorg-x11-server-debuginfo |
amazon | linux | xorg-x11-server-devel | p-cpe:/a:amazon:linux:xorg-x11-server-devel |
amazon | linux | xorg-x11-server-source | p-cpe:/a:amazon:linux:xorg-x11-server-source |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14347
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14360
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-25712
access.redhat.com/security/cve/CVE-2020-14347
access.redhat.com/security/cve/CVE-2020-14360
access.redhat.com/security/cve/CVE-2020-25712
alas.aws.amazon.com/AL2/ALAS-2021-1592.html
6.1 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:P/I:P/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5 High
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
26.5%