Vulnerability in Gnupg Libgcrypt
CVE-2018-6829
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.
Vulnerability class: POODLE (CVE-2014-3566)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.018 (78.0th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: +0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki (Exploit, Third Party Advisory)
- lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html (Third Party Advisory, Issue Tracking)
- github.com/weikengchen/attack-on-libgcrypt-elgamal (Third Party Advisory)
- www.oracle.com/security-alerts/cpujan2020.html
Frequently asked questions
- What is CVE-2018-6829?
- CVE-2018-6829 is a high-severity vulnerability in Gnupg Libgcrypt, classified under Use of a Broken or Risky Cryptographic Algorithm. CVSS score: 7.5/10. Published 2018-02-07.
- How severe is CVE-2018-6829?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2018-6829 known to be exploited?
- 20 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.