Segmentation Fault in Kamailio Due to Invalid SIP Message Handling
Summary
DEBIAN-CVE-2018-16657: In Kamailio before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message with an invalid Via header causes a segmentation fault and crashes Kamailio. Affects kamailio versions < 5.1.4-1. Fixed in 5.1.4-1. How to fix ↓
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Background
Kamailio is an open-source SIP server that facilitates the handling of Voice over IP (VoIP) communications. It is widely used for its scalability and flexibility in managing SIP signaling. However, prior to version 5.0.7 and 5.1.4, Kamailio was vulnerable to a denial of service attack caused by improper input validation in its core functions, specifically when processing SIP messages with invalid Via headers.
Vulnerability Detail
In Kamailio versions before 5.0.7 and 5.1.x before 5.1.4, a crafted SIP message containing an invalid Via header can lead to a segmentation fault, causing the server to crash. This vulnerability arises from a lack of input validation in the crcitt_string_array function, which is responsible for calculating CRC hashes for To tags. Additionally, the check_via_address function also suffers from similar input validation issues. The exploitation of this vulnerability could result in denial of service and potentially allow for arbitrary code execution.
How To Fix
Minimum fixed version
5.1.4-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade kamailioTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, you can implement input validation checks in your SIP message handling logic to prevent invalid messages from being processed. This can be done by filtering out SIP messages that do not conform to the expected format before they reach Kamailio.
Conclusion
The vulnerability in Kamailio due to improper handling of SIP messages poses significant risks, including denial of service and potential arbitrary code execution. It is crucial to update to the latest patched version to ensure the security of your VoIP communications. Implementing input validation can serve as a temporary measure until the update is applied.
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FAQ
The vulnerability can lead to a denial of service, causing Kamailio to crash and potentially allowing for arbitrary code execution.
You can check your Kamailio version using the command 'kamailio -v' in your terminal. If your version is below 5.0.7 or between 5.1.0 and 5.1.3, you are affected.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
If an immediate update is not possible, consider implementing input validation checks as a temporary workaround to mitigate the risk.
Detailed information can be found in the CVE database or the Debian security advisories related to Kamailio.
References
Related vulnerabilities
Recent vulnerabilities recorded for kamailio.
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