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AUSCERT External Security Bulletin Redistribution
ESB-2022.5784
USN-5720-1: Zstandard vulnerabilities
10 November 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Zstandard
Publisher: Ubuntu
Operating System: Ubuntu
Resolution: Patch/Upgrade
CVE Names: CVE-2021-24032 CVE-2021-24031
Original Bulletin:
https://ubuntu.com/security/notices/USN-5720-1
Comment: CVSS (Max): 5.5 CVE-2021-24031 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
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USN-5720-1: Zstandard vulnerabilities
9 November 2022
Zstandard could be made to expose sensitive information
Releases
o Ubuntu 16.04 ESM
Packages
o libzstd - fast lossless compression algorithm
Details
It was discovered that Zstandard was not properly managing file
permissions when generating output files. A local attacker could
possibly use this issue to cause a race condition and gain
unauthorized access to sensitive data.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o zstd - 1.3.1+dfsg-1~ubuntu0.16.04.1+esm3
Available with Ubuntu Pro (Infra-only)
o libzstd1 - 1.3.1+dfsg-1~ubuntu0.16.04.1+esm3
Available with Ubuntu Pro (Infra-only)
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-24031
o CVE-2021-24032
Related notices
o USN-4760-1 : libzstd-dev, libzstd, zstd, libzstd1-dev, libzstd1-udeb,
libzstd1
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