USN-4968-1: LZ4 vulnerability

Releases

• Ubuntu 21.04
• Ubuntu 20.10
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• lz4 - Extremely fast compression algorithm

Details

It was discovered that LZ4 incorrectly handled certain memory operations.
If a user or automated system were tricked into uncompressing a specially-
crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to
crash, resulting in a denial of service, or possibly execute arbitrary
code.

Update instructions

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

Ubuntu 21.04

• liblz4-1 - 1.9.3-1ubuntu0.1

Ubuntu 20.10

• liblz4-1 - 1.9.2-2ubuntu0.20.10.1

Ubuntu 20.04

• liblz4-1 - 1.9.2-2ubuntu0.20.04.1

Ubuntu 18.04

• liblz4-1 - 0.0~r131-2ubuntu3.1

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

References

• CVE-2021-3520

Related notices

• USN-4968-2: liblz4-tool, lz4, liblz4-1, liblz4-dev