Vulnerability in Opensips
CVE-2023-27598
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.010 (60.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 60th percentile — 60.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000
Affected products
- Opensips — versions < 3.1.7, >= 3.2.0, < 3.2.4
Weakness classification (CWE)
References
- github.com/OpenSIPS/opensips/security/advisories/GHSA-wxfg-3gwh-rhvx (Third Party Advisory)
- github.com/OpenSIPS/opensips/commit/ab611f74f69d9c42be5401c40d56ea06a58f5dd7 (Patch, Third Party Advisory)
- opensips.org/pub/audit-2022/opensips-audit-technical-report-full.pdf (Third Party Advisory)
Frequently asked questions
- What is CVE-2023-27598?
- CVE-2023-27598 is a high-severity vulnerability in Opensips, classified under Use of Uninitialized Resource. CVSS score: 7.5/10. Published 2023-03-15.
- How severe is CVE-2023-27598?
- High severity. CVSS v3 base score is 7.5 out of 10.