Information Exposure Affecting gnutls28 package, versions <3.7.1-5+deb11u3


0.0
high

Snyk CVSS

    Attack Complexity High
    Confidentiality High
    Integrity High

    Threat Intelligence

    EPSS 0.1% (42nd percentile)
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NVD
7.4 high
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SUSE
5.9 medium
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Red Hat
7.4 high

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  • Snyk ID SNYK-DEBIAN11-GNUTLS28-3318299
  • published 11 Feb 2023
  • disclosed 15 Feb 2023

How to fix?

Upgrade Debian:11 gnutls28 to version 3.7.1-5+deb11u3 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream gnutls28 package and not the gnutls28 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.