CVE-2023-0361 is a timing side-channel vulnerability in GnuTLS's handling of RSA ClientKeyExchange messages, affecting products like Debian, Fedora, NetApp, and Red Hat. This high-severity vulnerability (CVSS 7.4) allows a remote, unauthenticated attacker to perform a Bleichenbacher-style attack by sending numerous specially crafted messages, potentially recovering the encrypted key and decrypting application data. While no public exploit code or active exploitation has been observed, the vulnerability has garnered some community discussion and media coverage, indicating awareness of its potential impact.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
3.6.8-11.el8_2CPE matchmatch criteria | cpe:2.3:a:gnu:gnutls:3.6.8-11.el8_2:*:*:*:*:*:*:* | ||
8.0CPE matchmatch criteria | cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | ||
9.0CPE matchmatch criteria | cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | ||
10.0CPE matchmatch criteria | cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | ||
36CPE matchmatch criteria | cpe:2.3:o:fedoraproject:fedora:36:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
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.
Feb 14, 2023gnutls: timing side-channel in the TLS RSA key exchange code
Feb 14, 2023