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CVE
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CVE-2018-6829Date: (C)2018-02-15   (M)2023-12-22


cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, 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 Libgcrypt's ElGamal implementation.

CVSS Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 7.5CVSS Score : 5.0
Exploit Score: 3.9Exploit Score: 10.0
Impact Score: 3.6Impact Score: 2.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: LOW
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: NONE
Confidentiality: HIGHAvailability: NONE
Integrity: NONE 
Availability: NONE 
  
Reference:
https://github.com/weikengchen/attack-on-libgcrypt-elgamal
https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki
https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html
https://www.oracle.com/security-alerts/cpujan2020.html

CWE    1
CWE-327
OVAL    1
oval:org.secpod.oval:def:2001553

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