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
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.6 High
AI Score
Confidence
High
0.017 Low
EPSS
Percentile
87.8%
Several vulnerabilities were discovered in libxml2, a library providing support to read, modify and write XML and HTML files, which could cause denial of service via application crash when parsing specially crafted files.
For Debian 9 stretch, these problems have been fixed in version 2.9.4+dfsg1-2.2+deb9u4.
We recommend that you upgrade your libxml2 packages.
For the detailed security status of libxml2 please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libxml2
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-2653-1. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(149372);
script_version("1.8");
script_set_attribute(attribute:"plugin_modification_date", value:"2024/01/16");
script_cve_id(
"CVE-2021-3516",
"CVE-2021-3517",
"CVE-2021-3518",
"CVE-2021-3537"
);
script_name(english:"Debian DLA-2653-1 : libxml2 security update");
script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing a security update.");
script_set_attribute(attribute:"description", value:
"Several vulnerabilities were discovered in libxml2, a library
providing support to read, modify and write XML and HTML files, which
could cause denial of service via application crash when parsing
specially crafted files.
For Debian 9 stretch, these problems have been fixed in version
2.9.4+dfsg1-2.2+deb9u4.
We recommend that you upgrade your libxml2 packages.
For the detailed security status of libxml2 please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/libxml2
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/2021/05/msg00008.html");
script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/stretch/libxml2");
script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/libxml2");
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_cvss_temporal_vector("CVSS2#E:F/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H");
script_set_cvss3_temporal_vector("CVSS:3.0/E:F/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-3517");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-3518");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/05/14");
script_set_attribute(attribute:"patch_publication_date", value:"2021/05/10");
script_set_attribute(attribute:"plugin_publication_date", value:"2021/05/11");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dbg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-dev");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-doc");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-utils");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libxml2-utils-dbg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python-libxml2-dbg");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-libxml2");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:python3-libxml2-dbg");
script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:9.0");
script_set_attribute(attribute:"generated_plugin", value:"current");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Debian 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/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:"9.0", prefix:"libxml2", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libxml2-dbg", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libxml2-dev", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libxml2-doc", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libxml2-utils", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"libxml2-utils-dbg", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"python-libxml2", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"python-libxml2-dbg", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"python3-libxml2", reference:"2.9.4+dfsg1-2.2+deb9u4")) flag++;
if (deb_check(release:"9.0", prefix:"python3-libxml2-dbg", reference:"2.9.4+dfsg1-2.2+deb9u4")) 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 | libxml2 | p-cpe:/a:debian:debian_linux:libxml2 |
debian | debian_linux | libxml2-dbg | p-cpe:/a:debian:debian_linux:libxml2-dbg |
debian | debian_linux | libxml2-dev | p-cpe:/a:debian:debian_linux:libxml2-dev |
debian | debian_linux | libxml2-doc | p-cpe:/a:debian:debian_linux:libxml2-doc |
debian | debian_linux | libxml2-utils | p-cpe:/a:debian:debian_linux:libxml2-utils |
debian | debian_linux | libxml2-utils-dbg | p-cpe:/a:debian:debian_linux:libxml2-utils-dbg |
debian | debian_linux | python-libxml2 | p-cpe:/a:debian:debian_linux:python-libxml2 |
debian | debian_linux | python-libxml2-dbg | p-cpe:/a:debian:debian_linux:python-libxml2-dbg |
debian | debian_linux | python3-libxml2 | p-cpe:/a:debian:debian_linux:python3-libxml2 |
debian | debian_linux | python3-libxml2-dbg | p-cpe:/a:debian:debian_linux:python3-libxml2-dbg |
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3516
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3517
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3518
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3537
lists.debian.org/debian-lts-announce/2021/05/msg00008.html
packages.debian.org/source/stretch/libxml2
security-tracker.debian.org/tracker/source-package/libxml2
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
8.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.6 High
AI Score
Confidence
High
0.017 Low
EPSS
Percentile
87.8%