cve/2024/CVE-2024-6409.md

### [CVE-2024-6409](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-6409)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%206&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%207&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%208&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209.0%20Update%20Services%20for%20SAP%20Solutions&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20Enterprise%20Linux%209.2%20Extended%20Update%20Support&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20OpenShift%20Container%20Platform%204.13&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20OpenShift%20Container%20Platform%204.14&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20OpenShift%20Container%20Platform%204.15&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Red%20Hat%20OpenShift%20Container%20Platform%204.16&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Signal%20Handler%20Race%20Condition&color=brighgreen)

### Description

A race condition vulnerability was discovered in how signals are handled by OpenSSH's server (sshd). If a remote attacker does not authenticate within a set time period, then sshd's SIGALRM handler is called asynchronously. However, this signal handler calls various functions that are not async-signal-safe, for example, syslog(). As a consequence of a successful attack, in the worst case scenario, an attacker may be able to perform a remote code execution (RCE) as an unprivileged user running the sshd server.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/EGI-Federation/SVG-advisories
- https://github.com/bigb0x/OpenSSH-Scanner
- https://github.com/ryanalieh/openSSH-scanner