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AUSCERT External Security Bulletin Redistribution
ESB-2021.1411
USN-4926-1: Firefox vulnerabilities
27 April 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
Increased Privileges -- 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-2021-29947 CVE-2021-29946 CVE-2021-29945
CVE-2021-24002 CVE-2021-24001 CVE-2021-24000
CVE-2021-23999 CVE-2021-23998 CVE-2021-23997
CVE-2021-23996 CVE-2021-23995 CVE-2021-23994
Reference: ESB-2021.1393
ESB-2021.1390
ESB-2021.1344
ESB-2021.1327
ESB-2021.1312
Original Bulletin:
https://ubuntu.com/security/notices/USN-4926-1
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USN-4926-1: Firefox vulnerabilities
26 April 2021
Firefox could be made to crash or run programs as your login if it
opened a malicious website.
Releases
o Ubuntu 21.04
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, spoof the
browser UI, bypass security restrictions, trick the user into disclosing
confidential information, or execute arbitrary code. ( CVE-2021-23994 ,
CVE-2021-23996 , CVE-2021-23997 , CVE-2021-23998 , CVE-2021-23999 ,
CVE-2021-24000 , CVE-2021-24001 , CVE-2021-29945 , CVE-2021-29946 ,
CVE-2021-29947 )
A use-after-free was discovered when Responsive Design Mode was
enabled. If a user were tricked into opening a specially crafted
website with Responsive Design Mode enabled, an attacker could
potentially exploit this to cause a denial of service, or execute
arbitrary code. ( CVE-2021-23995 )
It was discovered that Firefox mishandled ftp URLs with encoded newline
characters. If a user were tricked into clicking on a specially crafted
link, an attacker could potentially exploit this to send arbitrary
FTP commands. ( CVE-2021-24002 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o firefox - 88.0+build2-0ubuntu0.21.04.1
Ubuntu 20.10
o firefox - 88.0+build2-0ubuntu0.20.10.1
Ubuntu 20.04
o firefox - 88.0+build2-0ubuntu0.20.04.1
Ubuntu 18.04
o firefox - 88.0+build2-0ubuntu0.18.04.2
Ubuntu 16.04
o firefox - 88.0+build2-0ubuntu0.16.04.1
After a standard system update you need to restart Firefox to make
all the necessary changes.
References
o CVE-2021-24000
o CVE-2021-23996
o CVE-2021-23997
o CVE-2021-23995
o CVE-2021-29946
o CVE-2021-23999
o CVE-2021-23994
o CVE-2021-23998
o CVE-2021-29945
o CVE-2021-24001
o CVE-2021-24002
o CVE-2021-29947
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