cve/2023/CVE-2023-27598.md

### [CVE-2023-27598](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-27598)
![](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-908%3A%20Use%20of%20Uninitialized%20Resource&color=brighgreen)

### Description

OpenSIPS is a Session Initiation Protocol (SIP) server implementation. Prior to versions 3.1.7 and 3.2.4, sending a malformed `Via` header to OpenSIPS triggers a segmentation fault when the function `calc_tag_suffix` is called. A specially crafted `Via` header, which is deemed correct by the parser, will pass uninitialized strings to the function `MD5StringArray` which leads to the crash. Abuse of this vulnerability leads to Denial of Service due to a crash. Since the uninitialized string points to memory location `0x0`, no further exploitation appears to be possible. No special network privileges are required to perform this attack, as long as the OpenSIPS configuration makes use of functions such as `sl_send_reply` or `sl_gen_totag` that trigger the vulnerable code. 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.