Information disclosure in Mozilla Thunderbird

1) Cleartext storage of sensitive information

EUVDB-ID: #VU52375

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-29950

CWE-ID: CWE-312 - Cleartext Storage of Sensitive Information

Exploit availability: No

Description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to the way Thunderbird handles secret OpenPGP keys. The application unprotects a secret OpenPGP key prior to using it for a decryption, signing or key import task. If the task runs into a failure, the secret key may remain in memory in its unprotected state. A local user or malicious application can read the key and use it to decrypt email messages.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla Thunderbird: 60.0 - 78.9.0

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2021-17/

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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