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CVE-2018-6594

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Date: February 2, 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.

Language: Python

Severity Score

Related Resources (10)

https://github.com/dlitz/pycrypto/issues/253
https://usn.ubuntu.com/3616-1/
https://usn.ubuntu.com/3616-2/
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html
https://access.redhat.com/security/cve/CVE-2018-6594
https://github.com/TElgamal/attack-on-pycrypto-elgamal
https://security.gentoo.org/glsa/202007-62
https://nvd.nist.gov/vuln/detail/CVE-2018-6594
https://people.canonical.com/~ubuntu-security/cve/CVE-2018-6594
https://www.mend.io/vulnerability-database/CVE-2018-6594

Severity Score

Weakness Type (CWE)

Cryptographic Issues

CWE-310

Inadequate Encryption Strength

CWE-326

Information Leak / Disclosure

CWE-200

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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