RUSTSEC-2023-0071
on 2023-11-22: Marvin Attack: potential key recovery through timing sidechannels
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The current version of RSA is 0.10.0-pre.1.
0.9.6 (older version)
From kornelski/crev-proofs copy of git.savannah.gnu.org.
Packaged for Guix (crates-crypto)
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May have been packaged automatically without a review
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To review the actual code of the crate, it's best to use cargo crev open rsa. Alternatively, you can download the tarball of rsa v0.10.0-pre.1 or view the source online.
Impact
Due to a non-constant-time implementation, information about the private key is leaked through timing information which is observable over the network. An attacker may be able to use that information to recover the key.
Patches
No patch is yet available, however work is underway to migrate to a fully constant-time implementation.
Workarounds
The only currently available workaround is to avoid using the
rsacrate in settings where attackers are able to observe timing information, e.g. local use on a non-compromised computer is fine.References
This vulnerability was discovered as part of the "Marvin Attack", which revealed several implementations of RSA including OpenSSL had not properly mitigated timing sidechannel attacks.
https://people.redhat.com/~hkario/marvin/
CVE-2023-49092
GHSA-c38w-74pg-36hr
GHSA-4grx-2x9w-596c