1. Ubuntu Security Notices
  2. USN-5310-1

USN-5310-1: GNU C Library vulnerabilities

Publication date

1 March 2022

Overview

Several security issues were fixed in GNU C Library.

Releases

Packages

Details

Jan Engelhardt, Tavis Ormandy, and others discovered that the GNU C Library
iconv feature incorrectly handled certain input sequences. An attacker
could possibly use this issue to cause the GNU C Library to hang or crash,
resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS
and Ubuntu 20.04 LTS. (CVE-2016-10228, CVE-2019-25013, CVE-2020-27618,
CVE-2020-29562, CVE-2021-3326)

Jason Royes and Samuel Dytrych discovered that the GNU C Library
incorrectly handled signed comparisons on ARMv7 targets. A remote attacker
could use this issue to cause the GNU C Library to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (

Jan Engelhardt, Tavis Ormandy, and others discovered that the GNU C Library
iconv feature incorrectly handled certain input sequences. An attacker
could possibly use this issue to cause the GNU C Library to hang or crash,
resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS
and Ubuntu 20.04 LTS. (CVE-2016-10228, CVE-2019-25013, CVE-2020-27618,
CVE-2020-29562, CVE-2021-3326)

Jason Royes and Samuel Dytrych discovered that the GNU C Library
incorrectly handled signed comparisons on ARMv7 targets. A remote attacker
could use this issue to cause the GNU C Library to crash, resulting in a
denial of service, or possibly execute arbitrary code. This issue only
affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-6096)

It was discovered that the GNU C Library nscd daemon incorrectly handled
certain netgroup lookups. An attacker could possibly use this issue to
cause the GNU C Library to crash, resulting in a denial of service. This
issue only affected Ubuntu 20.04 LTS. (CVE-2021-27645)

It was discovered that the GNU C Library wordexp function incorrectly
handled certain patterns. An attacker could use this issue to cause the
GNU C Library to crash, resulting in a denial of service, or possibly
obtain sensitive information. This issue only affected Ubuntu 18.04 LTS and
Ubuntu 20.04 LTS. (CVE-2021-35942)

It was discovered that the GNU C Library realpath function incorrectly
handled return values. An attacker could possibly use this issue to obtain
sensitive information. This issue only affected Ubuntu 21.10.
(CVE-2021-3998)

It was discovered that the GNU C library getcwd function incorrectly
handled buffers. An attacker could use this issue to cause the GNU C
Library to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-3999)

It was discovered that the GNU C Library sunrpc module incorrectly handled
buffer lengths. An attacker could possibly use this issue to cause the GNU
C Library to crash, resulting in a denial of service. (CVE-2022-23218,
CVE-2022-23219)

Update instructions

After a standard system update you need to reboot your computer to 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
21.10 impish libc6 –  2.34-0ubuntu3.2
20.04 focal libc6 –  2.31-0ubuntu9.7
18.04 bionic libc6 –  2.27-3ubuntu1.5

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References

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