Resource exhaustion in Freeswitch
CVE-2023-40019
FreeSWITCH is a Software Defined Telecom Stack enabling the digital transformation from proprietary telecom switches to a software implementation that runs on any commodity hardware. Prior to version 1.10.10, FreeSWITCH allows authorized users to cause a denial of service attack by sending re-INVITE with SDP containing duplicate codec names. When a call in FreeSWITCH completes codec negotiation, the `codec_string` channel variable is set with the result of the negotiation. On a subsequent re-negotiation, if an SDP is offered that contains codecs with the same names but with different formats, there may be too many codec matches detected by FreeSWITCH leading to overflows of its internal arrays. By abusing this vulnerability, an attacker is able to corrupt stack of FreeSWITCH leading to an undefined behavior of the system or simply crash it. Version 1.10.10 contains a patch for this issue.
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: 0.009 (58.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.008 · newest: 0.009 · change: +0.001
Affected products
- Freeswitch
- Signalwire Freeswitch — versions < 1.10.10
Weakness classification (CWE)
References
- github.com/signalwire/freeswitch/security/advisories/GHSA-gjj5-79p2-9g3q (Exploit, Vendor Advisory)
- github.com/signalwire/freeswitch/releases/tag/v1.10.10 (Release Notes)
Frequently asked questions
- What is CVE-2023-40019?
- CVE-2023-40019 is a high-severity vulnerability in Freeswitch, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2023-09-15.
- How severe is CVE-2023-40019?
- High severity. CVSS v3 base score is 7.5 out of 10.