A libzstd security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 20.10.
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Ubuntu Security Notice USN-4760-1
March 08, 2021
libzstd vulnerabilities
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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:
https://ubuntu.com/security/notices/USN-4760-1
CVE-2021-24031, CVE-2021-24032
Package Information:
https://launchpad.net/ubuntu/+source/libzstd/1.4.5+dfsg-4ubuntu0.1
https://launchpad.net/ubuntu/+source/libzstd/1.4.4+dfsg-3ubuntu0.1
https://launchpad.net/ubuntu/+source/libzstd/1.3.3+dfsg-2ubuntu1.2
