Published: 06/09/2021 Updated: 07/11/2023

CVSS v2 Base Score: 2.6 | Impact Score: 2.9 | Exploitability Score: 4.9

CVSS v3 Base Score: 5.9 | Impact Score: 3.6 | Exploitability Score: 2.2

VMScore: 231

Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N

The ElGamal implementation in Libgcrypt prior to 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.

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gnupg libgcrypt

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CWE-327 https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1 https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2 https://eprint.iacr.org/2021/923 https://security.gentoo.org/glsa/202210-13 https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=3462280f2e23e16adf3ed5176e0f2413d8861320 https://nvd.nist.gov https://access.redhat.com/errata/RHSA-2022:5699

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CVE-2021-40528

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