CVE-2018-6829

cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation.

Score

CVSS 3.0 7.5 High

Status

Modified - cve@mitre.org

Published

2018-02-07

Last modified

2024-08-05

Weaknesses

CWE-327

Affected products

• Libgcrypt (Gnupg)

References

• https://github.com/weikengchen/attack-on-libgcrypt-elgamal
• https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki
• https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html
• https://www.oracle.com/security-alerts/cpujan2020.html