Vulnerability in GNU Gnutls
CVE-2023-0361
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.
EPSS: 0.014 (71.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
- Gnu Gnutls — versions 3.6.8-11.el8_2
- Netapp Active_iq_unified_manager
- Netapp Converged_systems_advisor_agent
- Netapp Ontap_select_deploy_administration_utility
- Debian Debian_linux — versions 10.0
- Fedoraproject Fedora — versions 36, 37, 38
- Redhat Enterprise_linux — versions 8.0, 9.0
- N/a Gnutls — versions gnutls-3.7.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com (Patch, Issue Tracking)
- secalert@redhat.com (Exploit, Issue Tracking, Vendor Advisory)
- secalert@redhat.com (mailing-list, Mailing List, Third Party Advisory)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (vendor-advisory)
- secalert@redhat.com (Third Party Advisory)
- secalert@redhat.com
Frequently asked questions
- What is CVE-2023-0361?
- CVE-2023-0361 is a high-severity vulnerability in GNU Gnutls, classified under Observable Discrepancy. CVSS score: 7.4/10. Published 2023-02-15.
- How severe is CVE-2023-0361?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2023-0361 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.