CVE-2018-6594

Gentoo Linux Security Advisory 202007-62

Severity Score

7.5

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

lib/Crypto/PublicKey/ElGamal.py en PyCrypto hasta la versión 2.6.1 genera parámetros de clave ElGamal débiles, lo que permite que atacantes remotos obtengan información sensible mediante la lectura de datos en texto cifrado (p.ej., no tiene seguridad semántica a la hora de enfrentarse a un ataque solo en texto cifrado). La hipótesis DDH (Decisional Diffie-Hellman) no soporta la implementación ElGamal de PyCrypto.

USN-3616-1 fixed a vulnerability in Python Crypto. This update provides the corresponding update for Ubuntu 12.04 ESM. It was discovered that Python Crypto incorrectly generated ElGamal key parameters. A remote attacker could possibly use this issue to obtain sensitive information. Various other issues were also addressed.

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-02-02 CVE Reserved
2018-02-03 CVE Published
2024-08-05 CVE Updated
2024-08-05 First Exploit
2025-07-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-326: Inadequate Encryption Strength

CAPEC

References (6)

URL	Tag	Source
https://github.com/TElgamal/attack-on-pycrypto-elgamal	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/02/msg00018.html	Mailing List

URL	Date	SRC
https://github.com/dlitz/pycrypto/issues/253	2024-08-05

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202007-62	2020-07-31
https://usn.ubuntu.com/3616-1	2020-07-31
https://usn.ubuntu.com/3616-2	2020-07-31

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Dlitz Search vendor "Dlitz"		Pycrypto Search vendor "Dlitz" for product "Pycrypto"				<= 2.6.1 Search vendor "Dlitz" for product "Pycrypto" and version " <= 2.6.1"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				7.0 Search vendor "Debian" for product "Debian Linux" and version "7.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				12.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "12.04"		esm		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				17.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "17.10"		-		Affected