Use of a Broken or Risky Cryptographic Algorithm The advisory has been revoked - it doesn't affect any version of package gnupg (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-UBUNTU1604-GNUPG-613366
- published10 Sept 2020
- disclosed7 Feb 2018
Introduced: 7 Feb 2018
CVE-2018-6829 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.
NVD Description
Note: Versions mentioned in the description apply only to the upstream gnupg package and not the gnupg package as distributed by Ubuntu.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-6829
- 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