USN-5291-1: libarchive vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 20.04 LTS

Packages

• libarchive - Library to read/write archive files

Details

It was discovered that libarchive incorrectly handled symlinks. If a
user or automated system were tricked into processing a specially crafted
archive, an attacker could possibly use this issue to change modes, times,
ACLs, and flags on arbitrary files. (CVE-2021-23177, CVE-2021-31566)

It was discovered that libarchive incorrectly handled certain RAR archives.
If a user or automated system were tricked into processing a specially
crafted RAR archive, an attacker could use this issue to cause libarchive
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2021-36976)

Update instructions

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

Ubuntu 21.10

• libarchive13 - 3.4.3-2ubuntu0.1

Ubuntu 20.04

• libarchive13 - 3.4.0-2ubuntu1.1

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

References

• CVE-2021-23177
• CVE-2021-36976
• CVE-2021-31566