KLA12320
Multiple vulnerabilities in Mozilla Thunderbird

Multiple vulnerabilities were found in Mozilla Thunderbird. Malicious users can exploit these vulnerabilities to obtain sensitive information, cause denial of service, execute arbitrary code, spoof user interface.

Below is a complete list of vulnerabilities:

1. A bypass security vulnerability in SMTP STARTTLS connections can be exploited to bypass security restrictions and obtain sensitive information.
2. An use after free vulnerability in nsLanguageAtomService object can be exploited to cause denial of service.
3. A memory safety vulnerability can be exploited to execute arbitrary code.
4. A security UI vulnerability in message validation can be exploited to spoof user interface.
5. An use after free vulnerability in MessageTask can be exploited to cause denial of service.
6. A data race vulnerability in crossbeam-deque can be exploited to obtain sensitive information.

Mozilla Thunderbird earlier than 91.2

Update to the latest version
Download Thunderbird

MFSA2021-47