cve/2013/CVE-2013-0238.md

### [CVE-2013-0238](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-0238)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20n%2Fa%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The try_parse_v4_netmask function in hostmask.c in IRCD-Hybrid before 8.0.6 does not properly validate masks, which allows remote attackers to cause a denial of service (crash) via a mask that causes a negative number to be parsed.

### POC

#### Reference
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699267
- http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=699267
- http://www.openwall.com/lists/oss-security/2013/01/29/8
- http://www.openwall.com/lists/oss-security/2013/01/29/8

#### Github
No PoCs found on GitHub currently.