Headline
GHSA-c38w-74pg-36hr: Marvin Attack: potential key recovery through timing sidechannels
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.
- https://rustsec.org/advisories/RUSTSEC-2023-0071.html
- https://people.redhat.com/~hkario/marvin/
- https://github.com/RustCrypto/RSA/issues/19
Package
cargo rsa (Rust)
Affected versions
<= 0.9.5
Patched versions
None
Description
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.
- https://rustsec.org/advisories/RUSTSEC-2023-0071.html
- https://people.redhat.com/~hkario/marvin/
- RustCrypto/RSA#19
References
- GHSA-c38w-74pg-36hr
- https://nvd.nist.gov/vuln/detail/CVE-2023-49092
- RustCrypto/RSA#19 (comment)
tarcieri published to RustCrypto/RSA
Nov 28, 2023
Published by the National Vulnerability Database
Nov 28, 2023
Published to the GitHub Advisory Database
Nov 28, 2023
Reviewed
Nov 28, 2023
Last updated
Nov 28, 2023
Related news
RustCrypto/RSA is a portable RSA implementation in pure Rust. 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. There is currently no fix available. As a workaround, avoid using the RSA crate in settings where attackers are able to observe timing information, e.g. local use on a non-compromised computer.