CVE-2023-0361

gnutls: timing side-channel in the TLS RSA key exchange code

Published Feb 15, 2023 CVSS 3.1 · 7.4 High EPSS 1.5% KEV · Not listed
Description
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.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

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Advisories

Source ID Title
Debian DLA Debian DLA DLA-3321-1 gnutls28 security update
Debian DSA Debian DSA DSA-5349-1 gnutls28 security update
EUVD EUVD EUVD-2023-12422 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.
Ubuntu USN Ubuntu USN USN-5901-1 GnuTLS vulnerability
History
Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics epss

{'score': 0.02943}

epss

{'score': 0.03022}

Weaknesses
  • CWE-1300

    Improper Protection of Physical Side Channels

  • CWE-203

    Observable Discrepancy

Sources

Status
PUBLISHED
Assigner
redhat
Published
Updated
Oct 14, 2026, 7:28 PM
Reserved
Jan 18, 2023, 12:00 AM
Status
Modified
Published
Feb 15, 2023, 6:15 PM
Modified
Oct 14, 2026, 8:17 PM
Severity
Moderate
Public date
Feb 14, 2023, 12:00 AM