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AUSCERT External Security Bulletin Redistribution
ESB-2022.0166
USN-5226-1: systemd vulnerability
13 January 2022
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AusCERT Security Bulletin Summary
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Product: systemd
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3997
Reference: ESB-2022.0118
Original Bulletin:
https://ubuntu.com/security/notices/USN-5226-1
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USN-5226-1: systemd vulnerability
13 January 2022
systemd-tmpfiles could be made to crash or have other unspecified impacts.
Releases
o Ubuntu 21.10
o Ubuntu 21.04
o Ubuntu 20.04 LTS
Packages
o systemd - system and service manager
Details
It was discovered that systemd-tmpfiles employed uncontrolled recursion
when removing deeply nested directory hierarchies. A local attacker could
exploit this to cause systemd-tmpfiles to crash or have other unspecified
impacts.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.10
o systemd - 248.3-1ubuntu8.2
Ubuntu 21.04
o systemd - 247.3-3ubuntu3.7
Ubuntu 20.04
o systemd - 245.4-4ubuntu3.15
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3997
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