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AUSCERT External Security Bulletin Redistribution
ESB-2021.1100
USN-4897-1: Pygments vulnerability
31 March 2021
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AusCERT Security Bulletin Summary
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Product: Pygments
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-27291
Reference: ESB-2021.1070
ESB-2021.0984
Original Bulletin:
https://ubuntu.com/security/notices/USN-4897-1
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USN-4897-1: Pygments vulnerability
30 March 2021
Pygments could be made to hang if it opened a specially crafted file.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o pygments - Generic syntax highlighter
Details
Ben Caller discovered that Pygments incorrectly handled parsing certain
files. If a user or automated system were tricked into parsing a specially
crafted file, a remote attacker could cause Pygments to hang or consume
resources, resulting in a denial of service.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o python3-pygments - 2.3.1+dfsg-4ubuntu0.2
Ubuntu 20.04
o python3-pygments - 2.3.1+dfsg-1ubuntu2.2
o python-pygments - 2.3.1+dfsg-1ubuntu2.2
Ubuntu 18.04
o python3-pygments - 2.2.0+dfsg-1ubuntu0.2
o python-pygments - 2.2.0+dfsg-1ubuntu0.2
Ubuntu 16.04
o python3-pygments - 2.1+dfsg-1ubuntu0.2
o python-pygments - 2.1+dfsg-1ubuntu0.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-27291
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