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Ubuntu Security Notice USN-4991-1

Ubuntu Security Notice USN-4991-1
Posted Jun 17, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4991-1 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
advisories | CVE-2017-8872, CVE-2019-20388, CVE-2020-24977, CVE-2021-3517, CVE-2021-3537, CVE-2021-3541
MD5 | 3a41fa516f8c9d479efa94e90eb46556

Ubuntu Security Notice USN-4991-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4991-1
June 17, 2021

libxml2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in libxml2.

Software Description:
- libxml2: GNOME XML library

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 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:

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

Ubuntu 21.04:
libxml2 2.9.10+dfsg-6.3ubuntu0.1
libxml2-utils 2.9.10+dfsg-6.3ubuntu0.1

Ubuntu 20.10:
libxml2 2.9.10+dfsg-5ubuntu0.20.10.2
libxml2-utils 2.9.10+dfsg-5ubuntu0.20.10.2

Ubuntu 20.04 LTS:
libxml2 2.9.10+dfsg-5ubuntu0.20.04.1
libxml2-utils 2.9.10+dfsg-5ubuntu0.20.04.1

Ubuntu 18.04 LTS:
libxml2 2.9.4+dfsg1-6.1ubuntu1.4
libxml2-utils 2.9.4+dfsg1-6.1ubuntu1.4

Ubuntu 16.04 ESM:
libxml2 2.9.3+dfsg1-1ubuntu0.7+esm1
libxml2-utils 2.9.3+dfsg1-1ubuntu0.7+esm1

Ubuntu 14.04 ESM:
libxml2 2.9.1+dfsg1-3ubuntu4.13+esm2
libxml2-utils 2.9.1+dfsg1-3ubuntu4.13+esm2

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

References:
https://ubuntu.com/security/notices/USN-4991-1
CVE-2017-8872, CVE-2019-20388, CVE-2020-24977, CVE-2021-3516,
CVE-2021-3517, CVE-2021-3518, CVE-2021-3537, CVE-2021-3541

Package Information:
https://launchpad.net/ubuntu/+source/libxml2/2.9.10+dfsg-6.3ubuntu0.1
https://launchpad.net/ubuntu/+source/libxml2/2.9.10+dfsg-5ubuntu0.20.10.2
https://launchpad.net/ubuntu/+source/libxml2/2.9.10+dfsg-5ubuntu0.20.04.1
https://launchpad.net/ubuntu/+source/libxml2/2.9.4+dfsg1-6.1ubuntu1.4

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