CVE-2018-6594

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.

Published: Feb 3, 2018
Updated: May 9, 2024
CVE: CVE-2018-6594
GHSA: GHSA-6528-wvf6-f6qg
Severity: High
Exploit:

CVSS v3:

Severity: High
Score: 7.5
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2:

Severity: Medium
Score: 5
AV:N/AC:L/Au:N/C:P/I:N/A:N

CWEs:

CWE-326

OWASP TOP 10:

A3 - Sensitive Data Exposure

Affected Software
References

Software	From	Fixed in
dlitz / pycrypto	-	2.6.1.x
debian / debian_linux	7.0	7.0.x
canonical / ubuntu_linux	16.04	16.04.x
canonical / ubuntu_linux	14.04	14.04.x
canonical / ubuntu_linux	12.04	12.04.x
canonical / ubuntu_linux	17.10	17.10.x
pycrypto	-	2.6.1.x

https://github.com/dlitz/pycrypto/issues/253
https://github.com/TElgamal/attack-on-pycrypto-elgamal
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html
https://security.gentoo.org/glsa/202007-62
https://usn.ubuntu.com/3616-1/
https://usn.ubuntu.com/3616-2/

Vulnerability Database

CVE-2018-6594