cve/2023/CVE-2023-27599.md

### [CVE-2023-27599](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27599)
![](https://img.shields.io/static/v1?label=Product&message=opensips&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3D%20%3C%203.1.7%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-20%3A%20Improper%20Input%20Validation&color=brighgreen)

### Description

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.7 and 3.2.4, when the function `append_hf` handles a SIP message with a malformed To header, a call to the function `abort()` is performed, resulting in a crash. This is due to the following check in `data_lump.c:399` in the function `anchor_lump`. An attacker abusing this vulnerability will crash OpenSIPS leading to Denial of Service. It affects configurations containing functions that make use of the affected code, such as the function `append_hf`. This issue has been fixed in versions 3.1.7 and 3.2.4.

### POC

#### Reference
- https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf

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