Critical Buffer Overflow Vulnerability in tcpdump - CVE-2016-7931
Summary
ALPINE-CVE-2016-7931: The MPLS parser in tcpdump before 4.9.0 has a buffer overflow in print-mpls.c:mpls_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 powerful command-line packet analyzer tool used for network traffic monitoring and analysis. It allows users to capture and display the packets being transmitted or received over a network to troubleshoot issues or analyze traffic patterns. The tool is widely used by network administrators and security professionals for its ability to dissect various network protocols. However, a critical vulnerability has been identified in tcpdump versions prior to 4.9.0, which exposes users to potential buffer overflow attacks.
Vulnerability Detail
The vulnerability, identified as CVE-2016-7931, originates from a buffer overflow in the MPLS parser within tcpdump, specifically in the function print-mpls.c:mpls_print(). This flaw allows an attacker to exploit the buffer overflow, potentially leading to arbitrary code execution, system crashes, or unauthorized access to sensitive data. Given the severity of this vulnerability, it has been assigned a CVSS score of 9.8, indicating a critical risk level that necessitates immediate attention.
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 an immediate update is not feasible, consider restricting access to the tcpdump tool to trusted users only, and avoid running it with elevated privileges. Additionally, monitor network traffic closely for any unusual activity that may indicate exploitation attempts.
Conclusion
The buffer overflow vulnerability in tcpdump (CVE-2016-7931) poses a significant risk to users of the tool. It is crucial to update to the patched version to mitigate potential threats. Users are encouraged to monitor their systems and restrict access as a temporary measure until the update can be applied.
See every vulnerability recorded for tcpdump →
FAQ
CVE-2016-7931 is a critical buffer overflow vulnerability found in tcpdump versions prior to 4.9.0, which can lead to arbitrary code execution.
You can use the Vulert platform to check if your application is affected by this vulnerability by analyzing your manifest file at Vulert Scanner.
Failing to address this vulnerability may expose your system to potential attacks, including unauthorized access and data breaches.
Yes, tcpdump has released a patch in version 4.9.0 and later to fix the buffer overflow vulnerability.
If an immediate update is not possible, restrict access to tcpdump and monitor network traffic for any suspicious activity.
References
Related vulnerabilities
Recent vulnerabilities recorded for tcpdump.
