CVE-2021-40530

Description

The ElGamal implementation in Crypto++ through 8.5 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.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VJYOZGWI7TD27SEXILSM6VUTPPEICDL7/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HGVBZ2TTRKCTYAZTRHTF6OBD4W37F5MT/

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/57OJA2K5AHX5HAU2QBDRWLGIIUX7GASC/

https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2

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

https://eprint.iacr.org/2021/923

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3