[USN-4760-1] libzstd vulnerabilities

========================================================================== Ubuntu Security Notice USN-4760-1 March 08, 2021
libzstd vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS – Ubuntu 18.04 LTS
Summary:
libzstd could be made to expose sensitive information.
Software Description: – libzstd: fast lossless compression algorithm
Details:
It was discovered that libzstd incorrectly handled file permissions. A local attacker could possibly use this issue to access certain files, contrary to expectations.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: libzstd1 1.4.5+dfsg-4ubuntu0.1 zstd 1.4.5+dfsg-4ubuntu0.1
Ubuntu 20.04 LTS: libzstd1 1.4.4+dfsg-3ubuntu0.1 zstd 1.4.4+dfsg-3ubuntu0.1
Ubuntu 18.04 LTS: libzstd1 1.3.3+dfsg-2ubuntu1.2 zstd 1.3.3+dfsg-2ubuntu1.2
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-4760-1 CVE-2021-24031, CVE-2021-24032
Package Information: launchpad.net/ubuntu/+source/libzstd/1.4.5+dfsg-4ubuntu0.1 launchpad.net/ubuntu/+source/libzstd/1.4.4+dfsg-3ubuntu0.1 launchpad.net/ubuntu/+source/libzstd/1.3.3+dfsg-2ubuntu1.2