RUSTSEC-2023-0071: Marvin Attack: potential key recovery through timing sidechannels

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Marvin Attack: potential key recovery through timing sidechannels

Details
Package	rsa
Version	0.9.6
URL	RustCrypto/RSA#19 (comment)
Date	2023-11-22

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 rsa crate 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.

See advisory page for additional details.

[rustaceanrob]

From arti project dependencies

[oleonardolima]

FWIW it's a known issue by Arti's team, and I also noticed that when adding MVP tor support on fedimint.

As the arti team mentions it should not be affected as it does not use any private-key operation with RSA, but still a vulnerability in RSA nonetheless (ref.: https://gitlab.torproject.org/tpo/core/arti/-/blob/main/maint/cargo_audit#L22-27).

[rustaceanrob]

Thanks for the details on this