Critical Buffer Overflow Vulnerability in tcpdump: CVE-2016-7984
Summary
ALPINE-CVE-2016-7984: The TFTP parser in tcpdump before 4.9.0 has a buffer overflow in print-tftp.c:tftp_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 monitoring. The tool supports various protocols and provides detailed insights into network traffic. However, a critical vulnerability has been identified in tcpdump versions prior to 4.9.0, which exposes users to potential exploitation through a buffer overflow.
Vulnerability Detail
The vulnerability, identified as CVE-2016-7984, originates from a flaw in the TFTP parser within tcpdump, specifically in the function print-tftp.c:tftp_print(). This buffer overflow can be triggered by specially crafted TFTP packets, potentially allowing an attacker to execute arbitrary code, leading to unauthorized access or system compromise. The severity of this vulnerability is underscored by its CVSS score of 9.8, indicating a critical risk to affected systems.
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
As a temporary workaround, users can avoid processing TFTP packets until the tcpdump package is updated. This can be done by filtering out TFTP traffic in network monitoring configurations.
Conclusion
The CVE-2016-7984 vulnerability in tcpdump represents a significant risk due to its potential for exploitation through buffer overflow. Users are strongly advised to update to the patched version 4.9.0 or later to safeguard their systems. Regular monitoring for vulnerabilities using tools like Vulert can further enhance security.
See every vulnerability recorded for tcpdump →
FAQ
CVE-2016-7984 is a critical buffer overflow vulnerability in tcpdump that can be exploited through specially crafted TFTP packets.
You can check your tcpdump version by running 'tcpdump -v' in the terminal. If it is below 4.9.0, it is affected.
Failure to fix this vulnerability may lead to unauthorized access, data breaches, or system compromise due to potential remote code execution.
Yes, you can use Vulert, which monitors and alerts in real-time for open-source vulnerabilities using a manifest file like package-lock.json.
Detailed information about CVE-2016-7984 can be found in the official CVE database and security advisories related to tcpdump.
References
Related vulnerabilities
Recent vulnerabilities recorded for tcpdump.
