Headline
CVE-2023-0361: Timing sidechannel in RSA decryption (#1050) · Issues · gnutls / GnuTLS · GitLab
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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Timing sidechannel in RSA decryption
Description of problem:
The time for GnuTLS to respond to malformed RSA ciphertexts in ClientKeyExchange depends on kind of error in the RSA padding.
Generally, it looks like the response time depends on size of encrypted data in the PKCS#1 v1.5 encrypted data.
I’ve run tests with 1 million connections per probe, on a 2.4GHz skylake CPU with 1024 bit RSA key, the two probes with most dissimilar results were “too long (49-byte) pre master secret” and "invalid MAC in Finished on pos 0", it takes the server an extra 58.5ns to respond one over the other. This is with a 95% confidence interval of ±6.8ns.
Exact results of Wilcoxon signed-rank tests are in this report.csv file.
Version of gnutls used:
gnutls-3.6.8-11.el8_2.x86_64
Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
RHEL 8
How reproducible:
Time the server responses to differently malformed ClientKeyExchange data.
Actual results:
Timing of server responses depends on the way RSA ciphertext is malformed
Expected results:
The timing of server responses should be completely independent of the RSA ciphertexts.
Additional info:
We’re aware of other implementations that have the timing sidechannel, we’d like to coordinate the release of this information to the public.
Edited Feb 10, 2023 by Hubert Kario (@mention me if you need reply)
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