CVE-2023-0361
gnutls28 - security update
7.4
HIGH
CVSS 3.1
EPSS 3.6%
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.
How to fix CVE-2023-0361
To remediate CVE-2023-0361, upgrade the affected package to a fixed version below.
- —upgrade to 3.7.1-r2 or later
- —upgrade to 3.7.1-5+deb11u3 or later
- —upgrade to 3.6.7-4+deb10u10 or later
- —upgrade to 3.7.1-5+deb11u3 or later
Is CVE-2023-0361 being exploited?
Low — EPSS is 3.6%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 3.7.1-r2
- from 0, < 3.7.1-5+deb11u3
- from 0, < 3.6.7-4+deb10u10
- from 0, < 3.7.1-5+deb11u3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |