CVE-2018-6829

Publication date 7 February 2018

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gnupg	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected
libgcrypt11	18.04 LTS bionic	Not in release
	17.10 artful	Not in release
	16.04 LTS xenial	Not in release
	14.04 LTS trusty	Not affected
libgcrypt20	18.04 LTS bionic	Not affected
	17.10 artful	Not affected
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not in release

Notes

mdeslaur

this is a flaw in applications that misuse libgcrypt as of 2018-05-31, no actionable action in libgcrypt, marking as not-affected

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N