7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.05 Low
EPSS
Percentile
92.9%
Several issues were discovered in libx11, the client interface to the X Windows System. The functions XGetFontPath, XListExtensions, and XListFonts are vulnerable to an off-by-one override on malicious server responses. A malicious server could also send a reply in which the first string overflows, causing a variable set to NULL that will be freed later on, leading to a segmentation fault and Denial of Service. The function XListExtensions in ListExt.c interprets a variable as signed instead of unsigned, resulting in an out-of-bounds write (of up to 128 bytes), leading to a Denial of Service or possibly remote code execution.
For Debian 8 ‘Jessie’, these problems have been fixed in version 2:1.6.2-3+deb8u2.
We recommend that you upgrade your libx11 packages.
NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory DLA-1482-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(112184);
script_version("1.4");
script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/11");
script_cve_id("CVE-2018-14598", "CVE-2018-14599", "CVE-2018-14600");
script_name(english:"Debian DLA-1482-1 : libx11 security update");
script_summary(english:"Checks dpkg output for the updated packages.");
script_set_attribute(
attribute:"synopsis",
value:"The remote Debian host is missing a security update."
);
script_set_attribute(
attribute:"description",
value:
"Several issues were discovered in libx11, the client interface to the
X Windows System. The functions XGetFontPath, XListExtensions, and
XListFonts are vulnerable to an off-by-one override on malicious
server responses. A malicious server could also send a reply in which
the first string overflows, causing a variable set to NULL that will
be freed later on, leading to a segmentation fault and Denial of
Service. The function XListExtensions in ListExt.c interprets a
variable as signed instead of unsigned, resulting in an out-of-bounds
write (of up to 128 bytes), leading to a Denial of Service or possibly
remote code execution.
For Debian 8 'Jessie', these problems have been fixed in version
2:1.6.2-3+deb8u2.
We recommend that you upgrade your libx11 packages.
NOTE: Tenable Network Security has extracted the preceding description
block directly from the DLA security advisory. Tenable has attempted
to automatically clean and format it as much as possible without
introducing additional issues."
);
script_set_attribute(
attribute:"see_also",
value:"https://lists.debian.org/debian-lts-announce/2018/08/msg00030.html"
);
script_set_attribute(
attribute:"see_also",
value:"https://packages.debian.org/source/jessie/libx11"
);
script_set_attribute(attribute:"solution", value:"Upgrade the affected packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-6");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-6-dbg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-6-udeb");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-data");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-xcb-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-xcb1");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libx11-xcb1-dbg");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:8.0");
script_set_attribute(attribute:"patch_publication_date", value:"2018/08/29");
script_set_attribute(attribute:"plugin_publication_date", value:"2018/08/30");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_copyright(english:"This script is Copyright (C) 2018-2021 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:"8.0", prefix:"libx11-6", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-6-dbg", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-6-udeb", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-data", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-dev", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-doc", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-xcb-dev", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-xcb1", reference:"2:1.6.2-3+deb8u2")) flag++;
if (deb_check(release:"8.0", prefix:"libx11-xcb1-dbg", reference:"2:1.6.2-3+deb8u2")) flag++;
if (flag)
{
if (report_verbosity > 0) security_hole(port:0, extra:deb_report_get());
else security_hole(0);
exit(0);
}
else audit(AUDIT_HOST_NOT, "affected");
Vendor | Product | Version | CPE |
---|---|---|---|
debian | debian_linux | libx11-6 | p-cpe:/a:debian:debian_linux:libx11-6 |
debian | debian_linux | libx11-6-dbg | p-cpe:/a:debian:debian_linux:libx11-6-dbg |
debian | debian_linux | libx11-6-udeb | p-cpe:/a:debian:debian_linux:libx11-6-udeb |
debian | debian_linux | libx11-data | p-cpe:/a:debian:debian_linux:libx11-data |
debian | debian_linux | libx11-dev | p-cpe:/a:debian:debian_linux:libx11-dev |
debian | debian_linux | libx11-doc | p-cpe:/a:debian:debian_linux:libx11-doc |
debian | debian_linux | libx11-xcb-dev | p-cpe:/a:debian:debian_linux:libx11-xcb-dev |
debian | debian_linux | libx11-xcb1 | p-cpe:/a:debian:debian_linux:libx11-xcb1 |
debian | debian_linux | libx11-xcb1-dbg | p-cpe:/a:debian:debian_linux:libx11-xcb1-dbg |
debian | debian_linux | 8.0 | cpe:/o:debian:debian_linux:8.0 |
7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
0.05 Low
EPSS
Percentile
92.9%