Buffer Overflow Vulnerability in Kamailio: CVE-2018-8828
Summary
DEBIAN-CVE-2018-8828: A Buffer Overflow issue was discovered in Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2. Affects kamailio versions < 5.1.2-1. Fixed in 5.1.2-1. How to fix ↓
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Background
Kamailio is an open-source SIP server that is widely used for handling VoIP communications. It provides functionalities such as call routing, registration, and presence management. The software is designed to be highly scalable and flexible, making it a popular choice for service providers and enterprises. However, certain versions of Kamailio are vulnerable to a buffer overflow issue, which can lead to serious security risks.
Vulnerability Detail
A Buffer Overflow issue was discovered in Kamailio before version 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2. This vulnerability arises from the handling of specially crafted REGISTER messages that contain malformed branch or From tags. When processed, these messages can trigger an off-by-one heap-based buffer overflow in the tmx_check_pretran function located in the modules/tmx/tmx_pretran.c file. The consequences of this vulnerability may include application crashes or arbitrary code execution, posing significant risks to the integrity and availability of the affected systems.
How To Fix
Minimum fixed version
5.1.2-1
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 may consider filtering or validating incoming REGISTER messages to prevent malformed requests from reaching the Kamailio server. This can be done by implementing additional checks in your SIP message handling logic.
Conclusion
The buffer overflow vulnerability in Kamailio, identified as CVE-2018-8828, poses significant risks to systems using affected versions. It is crucial to update to the patched version 5.1.2-1 or later to mitigate these risks. Implementing workarounds can provide temporary relief, but a permanent fix through updates is recommended.
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FAQ
CVE-2018-8828 is a buffer overflow vulnerability found in specific versions of the Kamailio SIP server, which can lead to application crashes or code execution.
The affected versions include Kamailio before 4.4.7, 5.0.x before 5.0.6, and 5.1.x before 5.1.2.
You can use Vulert, which monitors open-source vulnerabilities in your software by analyzing a manifest file like package-lock.json. Visit Vulert Scanner to check your application without signing up.
If immediate updates are not possible, consider implementing message validation to filter out malformed REGISTER messages as a temporary measure.
Detailed information about CVE-2018-8828 can be found in the Debian CVE database and other security advisory platforms.
References
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