1. Ubuntu Security Notices
  2. USN-5391-1

USN-5391-1: libsepol vulnerabilities

Publication date

27 April 2022

Overview

Several security issues were fixed in libsepol.

Releases

Packages

  • libsepol - SELinux library for manipulating binary security policies

Details

Nicolas Iooss discovered that libsepol incorrectly handled memory
when handling policies. An attacker could possibly use this issue
to cause a crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2021-36084)

It was discovered that libsepol incorrectly handled memory when
handling policies. An attacker could possibly use this issue to cause
a crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-36085)

It was discovered that libsepol incorrectly handled memory when
handling policies. An attacker could possibly use this issue to cause
a crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affects Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS and Ubuntu 21.10. (CVE-2021-36086)

It was discovered that libsepol...

Nicolas Iooss discovered that libsepol incorrectly handled memory
when handling policies. An attacker could possibly use this issue
to cause a crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2021-36084)

It was discovered that libsepol incorrectly handled memory when
handling policies. An attacker could possibly use this issue to cause
a crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-36085)

It was discovered that libsepol incorrectly handled memory when
handling policies. An attacker could possibly use this issue to cause
a crash, resulting in a denial of service, or possibly execute
arbitrary code. This issue only affects Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS and Ubuntu 21.10. (CVE-2021-36086)

It was discovered that libsepol incorrectly validated certain data,
leading to a heap overflow. An attacker could possibly use this issue
to cause a crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2021-36087)

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
21.10 impish libsepol1 –  3.1-1ubuntu2.1
sepol-utils –  3.1-1ubuntu2.1
20.04 focal libsepol1 –  3.0-1ubuntu0.1
sepol-utils –  3.0-1ubuntu0.1
18.04 bionic libsepol1 –  2.7-1ubuntu0.1
sepol-utils –  2.7-1ubuntu0.1
16.04 xenial libsepol1 –  2.4-2ubuntu0.1~esm1  
sepol-utils –  2.4-2ubuntu0.1~esm1  

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References

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