Rustls vulnerable to an infinite loop in rustls::conn::ConnectionCommon::complete_io() with proper client input
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.9%
exploitation probability
0.9%top 40% of all CVEs
observed exploitation
nono source reports it
Rustls is a modern TLS library written in Rust. `rustls::ConnectionCommon::complete_io` could fall into an infinite loop based on network input. When using a blocking rustls server, if a client send a `close_notify` message immediately after `client_hello`, the server's `complete_io` will get in an infinite loop. This vulnerability is fixed in 0.23.5, 0.22.4, and 0.21.11.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
rustls · rustlsReferences
https://github.com/rustls/rustls/commit/2123576840aa31043a31b0770e6572136fbe0c2dhttps://github.com/rustls/rustls/commit/6e938bcfe82a9da7a2e1cbf10b928c7eca26426ehttps://github.com/rustls/rustls/commit/f45664fbded03d833dffd806503d3c8becd1b71ehttps://github.com/rustls/rustls/security/advisories/GHSA-6g7w-8wpp-frhj