CVE-2022-31001 – CVE-2022-31001 is an out-of-bounds read vulnera... (How to Fix)

Q: What is the severity of CVE-2022-31001?

CVE-2022-31001 has a CVSS score of 7.5 (HIGH). CVE-2022-31001 is an out-of-bounds read vulnerability in Sofia-SIP library that can cause crashes when processing malicious SDP messages. Attackers can exploit this by sending specially crafted SIP messages to FreeSWITCH servers. Systems using Sofia-SIP versions prior to 1.13.8 are affected.

📋 TL;DR

CVE-2022-31001 is an out-of-bounds read vulnerability in Sofia-SIP library that can cause crashes when processing malicious SDP messages. Attackers can exploit this by sending specially crafted SIP messages to FreeSWITCH servers. Systems using Sofia-SIP versions prior to 1.13.8 are affected.

💻 Affected Systems

Products:

FreeSWITCH
Sofia-SIP library

Versions: Sofia-SIP versions prior to 1.13.8

Operating Systems: Linux, Unix-like systems

Default Config Vulnerable: ⚠️ Yes

Notes: Any FreeSWITCH installation using vulnerable Sofia-SIP library versions is affected regardless of configuration.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Denial of service causing FreeSWITCH crash and service disruption, potentially leading to complete telephony system outage.

🟠

Likely Case

Service disruption through crash/restart cycles affecting SIP call processing and telephony services.

🟢

If Mitigated

Minimal impact with proper network segmentation and updated software.

🌐 Internet-Facing: HIGH - SIP servers are typically internet-facing and accept external messages.

🏢 Internal Only: MEDIUM - Internal SIP traffic could still trigger the vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires sending SIP messages with malicious SDP payloads to vulnerable endpoints.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 1.13.8

Vendor Advisory: https://github.com/freeswitch/sofia-sip/security/advisories/GHSA-79jq-hh82-cv9g

Restart Required: Yes

Instructions:

1. Update Sofia-SIP to version 1.13.8 or later. 2. Rebuild FreeSWITCH if using embedded library. 3. Restart FreeSWITCH service.

🔧 Temporary Workarounds

Network filtering

all

Block or filter malicious SIP messages at network perimeter

Rate limiting

all

Implement SIP message rate limiting to reduce attack surface

🧯 If You Can't Patch

Implement strict network segmentation for SIP traffic
Deploy intrusion detection/prevention systems to monitor for malicious SIP patterns

🔍 How to Verify

Check if Vulnerable:

Check Sofia-SIP library version: sofia-sip-config --version

Check Version:

sofia-sip-config --version

Verify Fix Applied:

Verify version is 1.13.8 or higher and test SIP message processing

📡 Detection & Monitoring

Log Indicators:

FreeSWITCH crash logs
Sofia-SIP segmentation fault errors
Abnormal SIP message processing

Network Indicators:

Malformed SDP in SIP messages
Unusual SIP traffic patterns

SIEM Query:

source="freeswitch.log" AND ("segmentation fault" OR "crash" OR "Sofia-SIP")

📊 Metadata

CVE ID: CVE-2022-31001

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE: CWE-125

Published: May 31, 2022

Last Updated: November 21, 2024

🔗 References

https://github.com/freeswitch/sofia-sip/commit/a99804b336d0e16d26ab7119d56184d2d7110a36 Patch,Third Party Advisory
https://github.com/freeswitch/sofia-sip/security/advisories/GHSA-79jq-hh82-cv9g Exploit,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00001.html Mailing List,Third Party Advisory
https://security.gentoo.org/glsa/202210-18 Third Party Advisory
https://www.debian.org/security/2023/dsa-5410 Third Party Advisory
https://github.com/freeswitch/sofia-sip/commit/a99804b336d0e16d26ab7119d56184d2d7110a36 Patch,Third Party Advisory
https://github.com/freeswitch/sofia-sip/security/advisories/GHSA-79jq-hh82-cv9g Exploit,Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/09/msg00001.html Mailing List,Third Party Advisory
https://security.gentoo.org/glsa/202210-18 Third Party Advisory
https://www.debian.org/security/2023/dsa-5410 Third Party Advisory

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