Remote code execution in Mozilla Thunderbird

1) Use-after-free

EUVDB-ID: #VU48235

Risk: High

CVSSv4.0: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2020-26950

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error when processing HTML content, caused by MCallGetProperty opcode write side effects. A remote attacker can create a specially crafted web page, trick the victim into opening it, trigger a use-after-free error and execute arbitrary code on the system.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 60.0 - 78.4.1

CPE2.3

• cpe:2.3:a:mozilla:mozilla_thunderbird:*:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_thunderbird:60.2.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_thunderbird:60.3:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_thunderbird:60.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:mozilla:mozilla_thunderbird:60.7.2:*:*:*:*:*:*:*

External links

https://www.mozilla.org/en-US/security/advisories/mfsa2020-49/

Q & A

Can this vulnerability be exploited remotely?

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

Is there known malware, which exploits this vulnerability?

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