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CVE-2018-6594

Published: 3 February 2018

lib/Crypto/PublicKey/ElGamal.py in PyCrypto through 2.6.1 generates weak ElGamal key parameters, 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 PyCrypto's ElGamal implementation.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
pycryptodome
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (3.4.7-1ubuntu1)
trusty Does not exist

upstream Needs triage

xenial Does not exist

Patches:
upstream: https://github.com/Legrandin/pycryptodome/commit/99c27a3b9e8a884bbde0e88c63234b669d4398d8

python-crypto
Launchpad, Ubuntu, Debian
artful
Released (2.6.1-7ubuntu0.1)
bionic
Released (2.6.1-8ubuntu2)
trusty
Released (2.6.1-4ubuntu0.3)
upstream Needs triage

xenial
Released (2.6.1-6ubuntu0.16.04.3)
Patches:

other: https://github.com/pghmcfc/pycrypto/commit/2f6c124e127b5dd98723e7e75a9825c4ed8bd5c7

Severity score breakdown

Parameter Value
Base score 7.5
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