Critical Buffer Overflow Vulnerability in tcpdump: CVE-2016-7930
Summary
ALPINE-CVE-2016-7930: The LLC/SNAP parser in tcpdump before 4.9.0 has a buffer overflow in print-llc.c:llc_print(). Affects tcpdump versions < 4.9.0-r0. Fixed in 4.9.0-r0. How to fix ↓
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Background
tcpdump is a widely used command-line packet analyzer tool that allows users to capture and display network packets being transmitted or received over a network. It is essential for network troubleshooting, analysis, and security auditing. The tool supports various protocols and provides detailed insights into network traffic. However, tcpdump versions prior to 4.9.0 are vulnerable to a critical buffer overflow issue that can be exploited by attackers.
Vulnerability Detail
The LLC/SNAP parser in tcpdump before version 4.9.0 contains a buffer overflow vulnerability located in the function print-llc.c:llc_print(). This flaw can be exploited by an attacker to execute arbitrary code, potentially leading to a complete system compromise. The vulnerability arises from improper handling of input data, allowing for excessive data to overflow into adjacent memory, which can corrupt data, crash the application, or allow for remote code execution.
How To Fix
Minimum fixed version
4.9.0-r0
This is the first release that contains the fix.
sudo apk add --upgrade tcpdumpTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If updating tcpdump is not immediately feasible, consider restricting access to the tcpdump tool to trusted users only. Additionally, monitor network traffic closely for any unusual activity that may indicate exploitation attempts.
Conclusion
The buffer overflow vulnerability in tcpdump (CVE-2016-7930) poses a significant risk to systems using outdated versions of the tool. It is essential to update to version 4.9.0 or later to mitigate this risk. Users should also consider monitoring their systems for any signs of exploitation.
See every vulnerability recorded for tcpdump →
FAQ
CVE-2016-7930 is a critical buffer overflow vulnerability in tcpdump that can lead to arbitrary code execution.
You can check your version of tcpdump by running 'tcpdump -v' in the command line. If it is below 4.9.0, it is vulnerable.
Exploitation of this vulnerability can lead to system crashes, data corruption, or unauthorized access to sensitive information.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json.
Detailed information can be found on the official CVE database or by visiting the Vulert website.
References
Related vulnerabilities
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