What’s Vulnerable › Vulnerabilities
CVE-2024-43798: Chisel AUTH environment variable not respected in server entrypoint
- Severity: high (CVSS 8.6 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2024-08-26 · updated 2026-06-17
- Weakness: CWE-306
Description
Chisel is a fast TCP/UDP tunnel, transported over HTTP, secured via SSH. The Chisel server doesn't ever read the documented `AUTH` environment variable used to set credentials, which allows any unauthenticated user to connect, even if credentials were set. Anyone running the Chisel server that is using the `AUTH` environment variable to specify credentials to authenticate against is affected by this vulnerability. Chisel is often used to provide an entrypoint to a private network, which means services that are gated by Chisel may be affected. Additionally, Chisel is often used for exposing services to the internet. An attacker could MITM requests by connecting to a Chisel server and requesting to forward traffic from a remote port. This issue has been addressed in release version 1.10.0. All users are advised to upgrade. There are no known workarounds for this vulnerability.
Affected products
- jpillora chisel: before 1.10.0 — fixed in 1.10.0
How to fix
Upgrade to a fixed version: jpillora chisel 1.10.0. Check the vendor advisory for mitigations.
References
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