cve/2021/CVE-2021-40528.md

CVE-2021-40528

Description

The ElGamal implementation in Libgcrypt before 1.9.4 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.

POC

Reference

• https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1

Github

• https://github.com/ARPSyndicate/cvemon
• https://github.com/brandoncamenisch/release-the-code-litecoin