A timing side-channel in the handling of RSA...
High severity
Unreviewed
Published
Feb 15, 2023
to the GitHub Advisory Database
•
Updated Jul 25, 2023
Description
Published by the National Vulnerability Database
Feb 15, 2023
Published to the GitHub Advisory Database
Feb 15, 2023
Last updated
Jul 25, 2023
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.
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