cve/2019/CVE-2019-5427.md

### [CVE-2019-5427](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5427)
![](https://img.shields.io/static/v1?label=Product&message=c3p0&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=XML%20Entity%20Expansion%20(CWE-776)&color=brighgreen)

### Description

c3p0 version < 0.9.5.4 may be exploited by a billion laughs attack when loading XML configuration due to missing protections against recursive entity expansion when loading configuration.

### POC

#### Reference
- https://hackerone.com/reports/509315
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/security-alerts/cpuoct2021.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/developer3000S/PoC-in-GitHub
- https://github.com/hectorgie/PoC-in-GitHub
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/shanika04/cp30_XXE_partial_fix