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EUVD-2026-5609

2026-10-13T04:06:29.153568+00:00

EUVD-2026-5609

fkie_cve-2024-35175

2026-10-13T04:06:29.153594+00:00

sshpiper is a reverse proxy for sshd. Starting in version 1.0.50 and prior to version 1.3.0, the way the proxy protocol listener is implemented in sshpiper can allow an attacker to forge their connecting address. Commit 2ddd69876a1e1119059debc59fe869cb4e754430 added the proxy protocol listener as the only listener in sshpiper, with no option to toggle this functionality off. This means that any connection that sshpiper is directly (or in some cases indirectly) exposed to can use proxy protocol to forge its source address. Any users of sshpiper who need logs from it for whitelisting/rate limiting/security investigations could have them become much less useful if an attacker is sending a spoofed source address. Version 1.3.0 contains a patch for the issue.

GHSA-4w53-6jvp-gg52 — sshpiper's enabling of proxy protocol without proper feature flagging allows faking source address

2026-10-13T04:06:29.153626+00:00

Affected: Go: github.com/tg123/sshpiper

### Summary

The way the proxy protocol listener is implemented in sshpiper can allow an attacker to forge their connecting address.

### Details

[This commit](https://github.com/tg123/sshpiper/commit/2ddd69876a1e1119059debc59fe869cb4e754430) added the proxy protocol listener as the only listener in sshpiper, with no option to toggle this functionality off. This means that any connection that sshpiper is directly (or in some cases indirectly) exposed to can use proxy protocol to forge its source address.

### PoC

You can use a configuration like this in HAProxy:

``` listen w-send-proxy mode tcp log global option tcplog bind *:27654 tcp-request connection set-src ipv4(1.1.1.1) server app1 ssh-piper-hostname:22 send-proxy ```

When connecting through HAProxy, sshpiper will log connections as originating from `1.1.1.1`. The proxy protocol data is designed to survive multiple load balancers or proxies and pass through to sshpiper at the end, so it should only be enabled trusted environments. This should be behind a configuration option or startup flag to prevent abuse when public connections can be made to sshpiper.

This is also backed up by [the specification for proxy protocol](https://www.haproxy.org/download/1.8/doc/proxy-protocol.txt):

> The receiver MUST be configured to only receive the protocol described in this specification and MUST not try to guess whether the protocol header is present or not. This means that the protocol explicitly prev…