CVE-2018-6829 Information

Description

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.

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Reference

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

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

7.5