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AUSCERT External Security Bulletin Redistribution
USN-5037-2: Firefox regression
26 August 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
Impact/Access: Reduced Security -- Existing Account
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USN-5037-2: Firefox regression
25 August 2021
USN-5037-1 caused a regression in Firefox.
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o firefox - Mozilla Open Source web browser
USN-5037-1 fixed vulnerabilities in Firefox. The update introduced a
regression that caused Firefox to repeatedly prompt for a password. This
update fixes the problem.
We apologize for the inconvenience.
Original advisory details:
Multiple security issues were discovered in Firefox. If a user were
tricked into opening a specially crafted website, an attacker could
potentially exploit these to cause a denial of service, obtain sensitive
information, trick a user into accepting unwanted permissions, or execute
The problem can be corrected by updating your system to the following package
o firefox - 91.0.2+build1-0ubuntu0.21.04.1
o firefox - 91.0.2+build1-0ubuntu0.20.04.1
o firefox - 91.0.2+build1-0ubuntu0.18.04.1
After a standard system update you need to restart Firefox to make
all the necessary changes.
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