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CVE-2023-0361

HIGHCVSS 7.4/10EPSS 1.40%

Last modified

CVE-2023-0361 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 1.40% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.4/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS Probability
1.40%

69.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
GnuGnutls3.6.8-11.el8_2
RedhatEnterprise Linux8.0
RedhatEnterprise Linux9.0
DebianDebian Linux10.0
FedoraprojectFedora36
FedoraprojectFedora37
FedoraprojectFedora38
NetappActive Iq Unified ManagerAll versions
NetappConverged Systems Advisor AgentAll versions
NetappOntap Select Deploy Administration UtilityAll versions

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2023-0361?
CVE-2023-0361 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.
How do I fix CVE-2023-0361?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-0361?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST