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Covert Timing Channel The advisory has been revoked - it doesn't affect any version of package gnutls-devel  (opens in a new tab)

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EPSS
1.4% (70th percentile)

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  • Snyk IDSNYK-RHEL9-GNUTLSDEVEL-12331029
  • published1 Sept 2025
  • disclosed14 Feb 2023
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Introduced: 14 Feb 2023

CVE-2023-0361  (opens in a new tab)
CWE-385  (opens in a new tab)

Amendment

The Red Hat security team deemed this advisory irrelevant for RHEL:9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls-devel package and not the gnutls-devel package as distributed by RHEL.

A timing side-channel in the handling of RSA ClientKeyExchange messages was discovered in GnuTLS. This side-channel can be sufficient to recover the key encrypted in the RSA ciphertext across a network in a Bleichenbacher style attack. To achieve a successful decryption the attacker would need to send a large amount of specially crafted messages to the vulnerable server. By recovering the secret from the ClientKeyExchange message, the attacker would be able to decrypt the application data exchanged over that connection.

References