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CVE-2021-40528

Published: 06 September 2021

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.

Priority

Medium

CVSS 3 base score: 5.9

Status

Package Release Status
libgcrypt20
Launchpad, Ubuntu, Debian
Upstream
Released (1.9.4-2)
Ubuntu 21.10 (Impish Indri)
Released (1.8.7-5ubuntu2)
Ubuntu 21.04 (Hirsute Hippo)
Released (1.8.7-2ubuntu2.1)
Ubuntu 20.04 LTS (Focal Fossa)
Released (1.8.5-5ubuntu1.1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1.8.1-4ubuntu1.3)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (1.6.5-2ubuntu0.6+esm1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

Patches:
Upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=3462280f2e23e16adf3ed5176e0f2413d8861320 (1.9x)
Upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=707c3c5c511ee70ad0e39ec613471f665305fbea (1.8x)