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Use of a Broken or Risky Cryptographic Algorithm Affecting libgcrypt20 package, versions <1.7.6-2+deb9u4

0.0
medium

Snyk CVSS

    Attack Complexity High
    Confidentiality High

    Threat Intelligence

    EPSS 0.18% (55th percentile)
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NVD
5.9 medium
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Red Hat
5.9 medium

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  • Snyk ID SNYK-DEBIAN9-LIBGCRYPT20-1582895
  • published 7 Sep 2021
  • disclosed 6 Sep 2021
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Introduced: 6 Sep 2021

CVE-2021-40528 Open this link in a new tab
CWE-327 Open this link in a new tab

How to fix?

Upgrade Debian:9 libgcrypt20 to version 1.7.6-2+deb9u4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libgcrypt20 package and not the libgcrypt20 package as distributed by Debian. See How to fix? for Debian:9 relevant fixed versions and status.

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.