USN-5391-1: libsepol vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

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 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

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

Ubuntu 21.10

• libsepol1 - 3.1-1ubuntu2.1
• sepol-utils - 3.1-1ubuntu2.1

Ubuntu 20.04

• libsepol1 - 3.0-1ubuntu0.1
• sepol-utils - 3.0-1ubuntu0.1

Ubuntu 18.04

• libsepol1 - 2.7-1ubuntu0.1
• sepol-utils - 2.7-1ubuntu0.1

Ubuntu 16.04

• libsepol1 - 2.4-2ubuntu0.1~esm1
  Available with Ubuntu Pro
• sepol-utils - 2.4-2ubuntu0.1~esm1
  Available with Ubuntu Pro

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

References

• CVE-2021-36086
• CVE-2021-36085
• CVE-2021-36084
• CVE-2021-36087