CVE Vulnerability

CVE-2021-40528

The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.

2.6 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 4.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

5.9 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 Third Party Advisory
https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 Exploit Third Party Advisory
https://eprint.iacr.org/2021/923 Technical Description Third Party Advisory
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320 Mailing List Patch
https://security.gentoo.org/glsa/202210-13 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:gnupg:libgcrypt:*:*:*:*:*:*:*:*
Information

Published : 2021-09-06 07:15

Updated : 2022-12-07 01:36

NVD link : CVE-2021-40528

Mitre link : CVE-2021-40528

Products Affected
No products.
CWE
CWE-327