CVE-2023-27598

OpenSIPS has vulnerability in the parse_via() function

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.08%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory opensips.org
Affected: OpenSIPS opensips
Published at:
Updated at:

References

Link Tags
https://github.com/OpenSIPS/opensips/security/advisories/GHSA-wxfg-3gwh-rhvx third party advisory
https://github.com/OpenSIPS/opensips/commit/ab611f74f69d9c42be5401c40d56ea06a58f5dd7 third party advisory patch
https://opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-27598?
CVE-2023-27598 has been scored as a high severity vulnerability.
How to fix CVE-2023-27598?
To fix CVE-2023-27598, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-27598 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-27598 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-27598?
CVE-2023-27598 affects OpenSIPS opensips.
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