Unbounded queuing of path validation messages in cloudflare-quiche
Moderate severity
GitHub Reviewed
Published
Dec 12, 2023
in
cloudflare/quiche
•
Updated Dec 13, 2023
Description
Published by the National Vulnerability Database
Dec 12, 2023
Published to the GitHub Advisory Database
Dec 13, 2023
Reviewed
Dec 13, 2023
Last updated
Dec 13, 2023
Impact
quiche v. 0.15.0 through 0.19.0 was discovered to be vulnerable to unbounded queuing of path validation messages, which could lead to excessive resource consumption.
QUIC path validation (RFC 9000 Section 8.2) requires that the recipient of a PATH_CHALLENGE frame responds by sending a PATH_RESPONSE. An unauthenticated remote attacker can exploit the vulnerability by sending PATH_CHALLENGE frames and manipulating the connection (e.g. by restricting the peer's congestion window size) so that PATH_RESPONSE frames can only be sent at the slower rate than they are received, leading to storage of path validation data in an unbounded queue.
Patches
Quiche versions greater than 0.19.0 address this problem.
References
CVE-2023-6193
RFC 9000 Section 8.2
References