CVE-2021-40529

 

Published at: - 06-09-2021 09:15

Last modified: - 10-08-2022 10:15

Total changes: - 8

Description

The ElGamal implementation in Botan through 2.18.1, as used in Thunderbird and other products, allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

 

Verification logic

 

Reference

• https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1
• https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2
• https://github.com/randombit/botan/pull/2790
• https://eprint.iacr.org/2021/923
• FEDORA-2021-14b0d97496-Mailing List, Third Party Advisory
• FEDORA-2021-8d51cac49f-Mailing List, Third Party Advisory
• GLSA-202208-14-

 

Keywords

NVD

 

CVE-2021-40529

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures