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AUSCERT External Security Bulletin Redistribution
ESB-2021.1064
USN-4893-1: Firefox vulnerabilities
26 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Firefox
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23988 CVE-2021-23987 CVE-2021-23986
CVE-2021-23985 CVE-2021-23984 CVE-2021-23983
CVE-2021-23982 CVE-2021-23981
Reference: ESB-2021.1060
ESB-2021.1057
ESB-2021.1003
Original Bulletin:
https://ubuntu.com/security/notices/USN-4893-1
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USN-4893-1: Firefox vulnerabilities
25 March 2021
Firefox could be made to crash or run programs as your login if it
opened a malicious website.
Releases
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
o Ubuntu 16.04 LTS
Packages
o firefox - Mozilla Open Source web browser
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, or execute arbitrary code. ( CVE-2021-23981 , CVE-2021-23982 ,
CVE-2021-23983 , CVE-2021-23987 , CVE-2021-23988 )
It was discovered that extensions could open popup windows with control
of the window title in some circumstances. If a user were tricked into
installing a specially crafted extension, an attacker could potentially
exploit this to spook a website and trick the user into providing
credentials. ( CVE-2021-23984 )
It was discovered that the DevTools remote debugging feature could be
enabled without an indication to the user. If a local attacker could
modify the browser configuration, a remote attacker could potentially
exploit this to obtain sensitive information. ( CVE-2021-23985 )
It was discovered that extensions could read the response of cross
origin requests in some circumstances. If a user were tricked into
installing a specially crafted extension, an attacker could potentially
exploit this to obtain sensitive information. ( CVE-2021-23986 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.10
o firefox - 87.0+build3-0ubuntu0.20.10.1
Ubuntu 20.04
o firefox - 87.0+build3-0ubuntu0.20.04.2
Ubuntu 18.04
o firefox - 87.0+build3-0ubuntu0.18.04.2
Ubuntu 16.04
o firefox - 87.0+build3-0ubuntu0.16.04.2
After a standard system update you need to restart Firefox to make
all the necessary changes.
References
o CVE-2021-23987
o CVE-2021-23986
o CVE-2021-23985
o CVE-2021-23988
o CVE-2021-23984
o CVE-2021-23981
o CVE-2021-23982
o CVE-2021-23983
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