CVE-2023-27598 OpenSIPS has vulnerability in the parse_via() function

High 7.5 Published 15 Mar 2023 Updated 25 Feb 2025

A malformed Via header causes a segmentation fault in OpenSIPS, leading to denial of service if specific configuration functions are used.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-27598?

CVE-2023-27598 is a high-severity vulnerability in opensips, published on 15 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-908

Which versions are affected by CVE-2023-27598?

It affects 1 product.

Products include Opensips Opensips.

How do I fix CVE-2023-27598?

No fix has been published for CVE-2023-27598 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-27598 being exploited?

There is no known exploitation of CVE-2023-27598 in the wild and no public exploit code.

Sources

Also known as GHSA-wxfg-3gwh-rhvx, UBUNTU-CVE-2023-27598.