1. Ubuntu Security Notices
  2. USN-4991-1

USN-4991-1: libxml2 vulnerabilities

Publication date

17 June 2021

Overview

Several security issues were fixed in libxml2.

Releases

Packages

Details

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...

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)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
21.04 hirsute libxml2 –  2.9.10+dfsg-6.3ubuntu0.1
libxml2-utils –  2.9.10+dfsg-6.3ubuntu0.1
20.10 groovy libxml2 –  2.9.10+dfsg-5ubuntu0.20.10.2
libxml2-utils –  2.9.10+dfsg-5ubuntu0.20.10.2
20.04 focal libxml2 –  2.9.10+dfsg-5ubuntu0.20.04.1
libxml2-utils –  2.9.10+dfsg-5ubuntu0.20.04.1
18.04 bionic libxml2 –  2.9.4+dfsg1-6.1ubuntu1.4
libxml2-utils –  2.9.4+dfsg1-6.1ubuntu1.4
16.04 xenial libxml2 –  2.9.3+dfsg1-1ubuntu0.7+esm1  
libxml2-utils –  2.9.3+dfsg1-1ubuntu0.7+esm1  
14.04 trusty libxml2 –  2.9.1+dfsg1-3ubuntu4.13+esm2  
libxml2-utils –  2.9.1+dfsg1-3ubuntu4.13+esm2  

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References

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