USN-5131-1: Firefox vulnerabilities

Releases

• Ubuntu 21.10
• Ubuntu 21.04
• Ubuntu 20.04 LTS
• Ubuntu 18.04 ESM

Packages

• 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, bypass security
restrictions, spoof the browser UI, confuse the user, conduct phishing
attacks, or execute arbitrary code. (CVE-2021-38503, CVE-2021-38504,
CVE-2021-38506, CVE-2021-38507, CVE-2021-38508, CVE-2021-38509)

It was discovered that the 'Copy Image Link' context menu action
would copy the final image URL after redirects. If a user were tricked
into copying and pasting a link for an embedded image that triggered
authentication flows back to the page, an attacker could potentially
exploit this to steal authentication tokens.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.10

• firefox - 94.0+build3-0ubuntu0.21.10.1

Ubuntu 21.04

• firefox - 94.0+build3-0ubuntu0.21.04.1

Ubuntu 20.04

• firefox - 94.0+build3-0ubuntu0.20.04.1

Ubuntu 18.04

• firefox - 94.0+build3-0ubuntu0.18.04.1

After a standard system update you need to restart Firefox to make
all the necessary changes.

References

• CVE-2021-38507
• CVE-2021-38509
• CVE-2021-38508
• CVE-2021-38503
• CVE-2021-38504
• CVE-2021-38506

Related notices

• USN-5152-1
• USN-5248-1