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.

Original advisories

MFSA2021-47

Related products

Mozilla-Thunderbird

CVE list

CVE-2021-38501 critical

CVE-2021-38496 critical

CVE-2021-38500 critical

CVE-2021-32810 critical

CVE-2021-38497 high

CVE-2021-38498 critical

CVE-2021-38502 high

Solution

Update to the latest version

Download Thunderbird

Impacts

• ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

• OSI

Obtain sensitive information. Exploitation of vulnerabilities with this impact can lead to capturing by abuser information, critical for user or system.

• DoS

Denial of service. Exploitation of vulnerabilities with this impact can lead to loss of system availability or critical functional fault.

• SB

Security bypass. Exploitation of vulnerabilities with this impact can lead to performing actions restricted by current security settings.

• SUI

Spoof user interface. Exploitation of vulnerabilities with this impact can lead to changes in user interface to beguile user into inaccurate behavior.

Affected Products

• Mozilla Thunderbird earlier than 91.2