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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.015 (73.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 73.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.014 · newest: 0.015 · change: +0.000
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 Linux — versions 10.0
- Fedoraproject Fedora — versions 36, 37, 38
- Red Hat Enterprise Linux — versions 8.0, 9.0
- Gnutls — versions gnutls-3.7.6
Weakness classification (CWE)
Public proof-of-concept exploits
References
- access.redhat.com/security/cve/CVE-2023-0361 (Third Party Advisory)
- github.com/tlsfuzzer/tlsfuzzer/pull/679 (Patch, Issue Tracking)
- gitlab.com/gnutls/gnutls/-/issues/1050 (Exploit, Issue Tracking, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2023/02/msg00015.html (mailing-list, Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- security.netapp.com/advisory/ntap-20230324-0005/ (Third Party Advisory)
- security.netapp.com/advisory/ntap-20230725-0005/
- 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
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.