cve/2019/CVE-2019-9740.md

### [CVE-2019-9740](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9740)
![](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

An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.

### POC

#### Reference
- http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-Updates.html
- http://www.openwall.com/lists/oss-security/2021/02/04/2
- https://bugs.python.org/issue36276
- https://usn.ubuntu.com/4127-2/
- https://www.oracle.com/security-alerts/cpujul2022.html

#### Github
- https://github.com/Tiaonmmn/renderer
- https://github.com/lanjelot/ctfs
- https://github.com/ltfafei/my_POC