CVE-2018-6829 Weak cryptography in n/a

High 7.5 Published 7 Feb 2018 Updated 5 Aug 2024

Attackers can obtain sensitive information from ciphertext due to improper ElGamal encoding in Libgcrypt, violating semantic security assumptions.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2018-6829?

CVE-2018-6829 is a high-severity vulnerability in n/a, published on 7 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-327

Which versions are affected by CVE-2018-6829?

It affects 1 product.

Products include Gnupg Libgcrypt.

How do I fix CVE-2018-6829?

Upgrade to a fixed version.

Is CVE-2018-6829 being exploited?

There is no known exploitation of CVE-2018-6829 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2018-6829, GHSA-wcf7-2f92-j5mv, ROOT-OS-DEBIAN-12-CVE-2018-6829.