USN-4968-1: LZ4 vulnerability

Publication date

26 May 2021

Overview

LZ4 could be made to crash or run programs if it opened a specially crafted file.


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.

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

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
21.04 hirsute liblz4-1 –  1.9.3-1ubuntu0.1
20.10 groovy liblz4-1 –  1.9.2-2ubuntu0.20.10.1
20.04 focal liblz4-1 –  1.9.2-2ubuntu0.20.04.1
18.04 bionic liblz4-1 –  0.0~r131-2ubuntu3.1

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