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.
The product uses a broken or risky cryptographic algorithm or protocol.
| Link | Tags |
|---|---|
| https://eprint.iacr.org/2021/923 | third party advisory technical description |
| https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 | third party advisory |
| https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 | third party advisory exploit |
| https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=3462280f2e23e16adf3ed5176e0f2413d8861320 | |
| https://security.gentoo.org/glsa/202210-13 | third party advisory vendor advisory |