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Test ID:1.3.6.1.4.1.25623.1.0.844978
Category:Ubuntu Local Security Checks
Title:Ubuntu: Security Advisory for libxml2 (USN-4991-1)
Summary:The remote host is missing an update for the 'libxml2'; package(s) announced via the USN-4991-1 advisory.
Description:Summary:
The remote host is missing an update for the 'libxml2'
package(s) announced via the USN-4991-1 advisory.

Vulnerability Insight:
Yunho Kim discovered that libxml2 incorrectly handled certain error
conditions. A remote attacker could exploit this with a crafted XML file to
cause a denial of service, or possibly cause libxml2 to expose sensitive
information. This issue only affected Ubuntu 14.04 ESM, and Ubuntu 16.04
ESM. (CVE-2017-8872)

Zhipeng Xie discovered that libxml2 incorrectly handled certain XML
schemas. A remote attacker could possibly use this issue to cause a denial
of service. This issue only affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM,
and Ubuntu 18.04 LTS. (CVE-2019-20388)

It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A
remote attacker could possibly exploit this with a crafted XML file to
cause libxml2 to crash, resulting in a denial of service. This issue only
affected Ubuntu 14.04 ESM, Ubuntu 16.04 ESM, Ubuntu 18.04 LTS, Ubuntu 20.04
LTS and Ubuntu 20.10. (CVE-2020-24977)

It was discovered that libxml2 incorrectly handled invalid UTF-8 input. A
remote attacker could possibly exploit this with a crafted XML file to
cause libxml2 to crash, resulting in a denial of service. (CVE-2021-3517)

It was discovered that libxml2 did not properly handle certain crafted XML
files. A local attacker could exploit this with a crafted input to cause
libxml2 to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-3516, CVE-2021-3518)

It was discovered that libxml2 incorrectly handled error states. A remote
attacker could exploit this with a crafted XML file to cause libxml2 to
crash, resulting in a denial of service. (CVE-2021-3537)

Sebastian Pipping discovered that libxml2 did not properly handle certain
crafted XML files. A remote attacker could exploit this with a crafted XML
file to cause libxml2 to crash, resulting in a denial of service. This
issue only affected Ubuntu 20.04 LTS, Ubuntu 20.10, and Ubuntu 21.04.
(CVE-2021-3541)

Affected Software/OS:
'libxml2' package(s) on Ubuntu 20.10, Ubuntu 20.04 LTS, Ubuntu 18.04 LTS.

Solution:
Please install the updated package(s).

CVSS Score:
7.5

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2017-8872
https://bugzilla.gnome.org/show_bug.cgi?id=775200
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
Common Vulnerability Exposure (CVE) ID: CVE-2021-3517
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV/
https://security.gentoo.org/glsa/202107-05
https://bugzilla.redhat.com/show_bug.cgi?id=1954232
https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4@%3Cissues.bookkeeper.apache.org%3E
https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b@%3Cissues.bookkeeper.apache.org%3E
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html
Common Vulnerability Exposure (CVE) ID: CVE-2021-3516
https://gitlab.gnome.org/GNOME/libxml2/-/commit/1358d157d0bd83be1dfe356a69213df9fac0b539
https://gitlab.gnome.org/GNOME/libxml2/-/issues/230
https://bugzilla.redhat.com/show_bug.cgi?id=1954225
Common Vulnerability Exposure (CVE) ID: CVE-2021-3518
https://bugzilla.redhat.com/show_bug.cgi?id=1954242
Common Vulnerability Exposure (CVE) ID: CVE-2021-3537
https://bugzilla.redhat.com/show_bug.cgi?id=1956522
Common Vulnerability Exposure (CVE) ID: CVE-2021-3541
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