### [CVE-2011-4415](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4415)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.

### POC

#### Reference
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/
- http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/DButter/whitehat_public
- https://github.com/Dokukin1/Metasploitable
- https://github.com/GiJ03/ReconScan
- https://github.com/Iknowmyname/Nmap-Scans-M2
- https://github.com/MrFrozenPepe/Pentest-Cheetsheet
- https://github.com/NikulinMS/13-01-hw
- https://github.com/RoliSoft/ReconScan
- https://github.com/SecureAxom/strike
- https://github.com/Zhivarev/13-01-hw
- https://github.com/issdp/test
- https://github.com/kasem545/vulnsearch
- https://github.com/matoweb/Enumeration-Script
- https://github.com/smabramov/Vulnerabilities-and-attacks-on-information-systems
- https://github.com/syadg123/pigat
- https://github.com/teamssix/pigat
- https://github.com/xxehacker/strike
- https://github.com/zzzWTF/db-13-01