Heap-Based Buffer Overflow in Kamailio - CVE-2016-2385
Summary
CVE-2016-2385: Heap-based buffer overflow in the encode_msg function in encode_msg.c in the SEAS module in Kamailio (formerly OpenSER and SER) before 4.3.5 allows remote attackers to cause a denial of service (memory corruption and pro... Affects kamailio across 2 version ranges.
< 4.3.4-2
< f50c9c853e7809810099c970780c30b0765b0643
Fixed in 4.3.4-2. How to fix ↓
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Background
Kamailio is an open-source SIP server that enables the handling of VoIP (Voice over Internet Protocol) communications. It is widely used for its scalability and flexibility in managing SIP signaling. The SEAS module within Kamailio is responsible for encoding messages, but it has a critical vulnerability that can be exploited by attackers to disrupt service or execute arbitrary code.
Vulnerability Detail
The vulnerability identified as CVE-2016-2385 is a heap-based buffer overflow in the encode_msg function located in encode_msg.c of the SEAS module in Kamailio versions prior to 4.3.5. This flaw allows remote attackers to send large SIP packets that can lead to memory corruption, causing the Kamailio process to crash or potentially allowing the execution of arbitrary code. The severity of this vulnerability is underscored by its CVSS score of 9.8, indicating a critical risk to systems running affected versions.
How To Fix
Minimum fixed version
4.3.4-2
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
If immediate upgrading is not feasible, consider implementing network-level protections such as firewalls to filter out potentially malicious SIP packets. Additionally, you can limit the size of SIP packets accepted by your server to mitigate the risk until a proper upgrade can be performed.
Conclusion
CVE-2016-2385 represents a significant security risk for users of Kamailio prior to version 4.3.5. It is crucial to upgrade to the latest version to protect against potential exploits that could lead to service disruption or unauthorized access. Regular monitoring and prompt updates are essential for maintaining the security of your systems.
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FAQ
CVE-2016-2385 is a vulnerability in the Kamailio SIP server that allows remote attackers to exploit a buffer overflow, potentially leading to service disruption or arbitrary code execution.
You can check your Kamailio version by running 'kamailio -v' in your terminal. If it is below 4.3.5, it is vulnerable.
Failure to address this vulnerability can result in denial of service attacks, memory corruption, and unauthorized code execution, compromising the security and stability of your SIP communications.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check for vulnerabilities without signup at the Vulert playground.
The CVSS score for CVE-2016-2385 is 9.8, indicating a critical level of severity.
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