During startup, an attacker that can man-in-the-middle traffic to and from NTS key exchange servers can trigger a very expensive key validation process due to a vulnerability in webpki.

Impact

This vulnerability can lead to excessive cpu usage on startup on clients configured to use NTS

Patches

Affected users are recommended to upgrade to version 0.3.7

References

See also https://github.com/rustsec/advisory-db/blob/main/crates/rustls-webpki/RUSTSEC-2023-0053.md

References

• GHSA-37xq-q42p-rv3p
• pendulum-project/ntpd-rs@927952a
• https://github.com/rustsec/advisory-db/blob/main/crates/rustls-webpki/RUSTSEC-2023-0053.md