vulnwire
7.5high

CVE-2018-6829

cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers…

Published 8 y ago · modified 4 mo ago · JSON

CVSS
7.5
v3.0 · NVD
CISA KEV
No
not known exploited
EPSS
1.8%
percentile 78%
Public exploits
0
none known

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.

Exploit prediction (EPSS)

1.78% probability of exploitation in the next 30 days, higher than 78% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
NVD3.07.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD2.05.0AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

  • github.com /weikengchen/attack-on-libgcrypt-elgamal/wiki · x_refsource_MISC, x_transferred
  • lists.gnupg.org /pipermail/gcrypt-devel/2018-February/004394.html · x_refsource_MISC, x_transferred
  • github.com /weikengchen/attack-on-libgcrypt-elgamal · x_refsource_MISC, x_transferred
  • oracle.com /security-alerts/cpujan2020.html · x_refsource_MISC, x_transferred

Sources

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