### [CVE-2014-3660](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-3660)
![](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

parser.c in libxml2 before 2.9.2 does not properly prevent entity expansion even when entity substitution has been disabled, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted XML document containing a large number of nested entity references, a variant of the "billion laughs" attack.

### POC

#### Reference
- http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
- http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html

#### Github
- https://github.com/hackerhouse-opensource/exploits
- https://github.com/projectivetech/nokogiri-strdup-segfault-mwe