Information disclosure in Mozilla Firefox



Published: 2021-06-16
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
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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

CVSSv3.1: 2.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

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

External links

http://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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