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.
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
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.02943}

epss

{'score': 0.03022}


cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2025-03-19T17:45:36.732Z

Reserved: 2023-01-18T00:00:00.000Z

Link: CVE-2023-0361

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2023-02-15T18:15:11.683

Modified: 2025-03-19T18:15:18.747

Link: CVE-2023-0361

cve-icon Redhat

Severity : Moderate

Publid Date: 2023-02-14T00:00:00Z

Links: CVE-2023-0361 - Bugzilla

cve-icon OpenCVE Enrichment

No data.