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AUSCERT External Security Bulletin Redistribution
ESB-2021.0416
USN-4721-1: Flatpak vulnerability
5 February 2021
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AusCERT Security Bulletin Summary
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Product: Flatpak
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-21261
Reference: ESB-2021.0341
Original Bulletin:
https://ubuntu.com/security/notices/USN-4721-1
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USN-4721-1: Flatpak vulnerability
04 February 2021
Flatpak could be made to crash or run programs if it received
specially crafted input.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o flatpak - Application deployment framework for desktop apps
Details
Simon McVittieg discovered that flatpak-portal service allowed sandboxed
applications to execute arbitrary code on the host system (a sandbox
escape). A malicious user could create a Flatpak application that set
environment variables, trusted by the Flatpak "run" command, and use it
to execute arbitrary code outside the sandbox.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o flatpak - 1.8.2-1ubuntu0.1
o libflatpak0 - 1.8.2-1ubuntu0.1
Ubuntu 20.04
o flatpak - 1.6.5-0ubuntu0.2
o libflatpak0 - 1.6.5-0ubuntu0.2
Ubuntu 18.04
o flatpak - 1.0.9-0ubuntu0.2
o libflatpak0 - 1.0.9-0ubuntu0.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-21261
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