CVE-2018-6594

high

Description

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.

References

https://usn.ubuntu.com/3616-2/

https://usn.ubuntu.com/3616-1/

https://security.gentoo.org/glsa/202007-62

https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html

https://github.com/dlitz/pycrypto/issues/253

https://github.com/TElgamal/attack-on-pycrypto-elgamal

Details

Source: Mitre, NVD

Published: 2018-02-03

Updated: 2024-11-21

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Severity: Medium

CVSS v3

Base Score: 7.5

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

Severity: High

CVSS v4

Base Score: 8.7

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Severity: High