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GHSA-52xf-5p2m-9wrv
No affected components available
When receiving a message from a client that sent an invalid RSA premaster secret, an issue in s2n-tls results in the server performing additional processing when the premaster secret contains an incorrect client hello version. While no practical attack on s2n-tls has been demonstrated, this causes a small timing difference which could theoretically be used as described in the Marvin Attack [1].
We would like to thank Hubert Kario [2] for reporting this issue.
Impact
The extent of this issue is a timing difference. No practical attack on s2n-tls has been demonstrated.
This issue affects server applications that permit RSA key exchange. Applications that use the default, built-in blinding feature or properly implement self-service blinding are not affected.
Impacted versions: <= v1.4.15.
Patches
The patch is included in v1.4.16 [3].
Workarounds
Applications can work around this issue by using an s2n-tls security policy that disallows RSA key exchange.
If you have any questions or comments about this advisory we ask that you contact AWS/Amazon Security via our vulnerability reporting page [4] or directly via email to aws-security@amazon.com. Please do not create a public GitHub issue.
[1] https://people.redhat.com/~hkario/marvin/ [2] https://github.com/tomato42 [3] https://github.com/aws/s2n-tls/releases/tag/v1.4.16 [4] https://aws.amazon.com/security/vulnerability-reporting
Measures severity based on intrinsic characteristics of the vulnerability, independent of environment.
No exploitation activity has been observed at this time. Continue routine monitoring.
Probability that this vulnerability will be exploited in the wild within the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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