Information disclosure in Mozilla Firefox



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-29968
CWE-ID CWE-125
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor Mozilla

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Out-of-bounds read

EUVDB-ID: #VU54156

Risk: Low

CVSSv4.0: 0.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-29968

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when drawing text onto a canvas with WebRender disabled. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger out-of-bounds read error and read contents of memory on the system.

Note, the vulnerability affects Windows installations only.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 80.0 - 89.0

CPE2.3 External links

https://www.mozilla.org/en-US/security/advisories/mfsa2021-27/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to visit a specially crafted website.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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