Critical Buffer Overflow Vulnerability in tcpdump: CVE-2016-7929
Summary
ALPINE-CVE-2016-7929: The Juniper PPPoE ATM parser in tcpdump before 4.9.0 has a buffer overflow in print-juniper.c:juniper_parse_header(). 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 packets being transmitted or received over a network. The tool is widely utilized by network administrators and security professionals for troubleshooting and monitoring network performance. 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-2016-7929, originates from a flaw in the Juniper PPPoE ATM parser within tcpdump. Specifically, the issue lies in the function 'juniper_parse_header()' located in print-juniper.c. This buffer overflow can be exploited by an attacker to execute arbitrary code, leading to severe consequences such as unauthorized access to sensitive data, system crashes, or complete control over the affected system. The CVSS score for this vulnerability is 9.8, indicating its critical nature and the high risk it poses to systems running vulnerable versions of tcpdump.
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 using the affected features of tcpdump that rely on the Juniper PPPoE ATM parser until the package is updated. However, this does not eliminate the risk entirely and is not a substitute for applying the patch.
Conclusion
In summary, the CVE-2016-7929 vulnerability in tcpdump poses a significant risk due to its potential for exploitation through a buffer overflow. Users are strongly advised to update to version 4.9.0-r0 or later to mitigate this risk. Additionally, utilizing tools like Vulert can help in monitoring and managing open-source vulnerabilities effectively.
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FAQ
CVE-2016-7929 is a critical buffer overflow vulnerability found in tcpdump that can allow attackers to execute arbitrary code.
You can check your version of tcpdump by running 'tcpdump -v' in the terminal. If it is below 4.9.0, it is vulnerable.
Exploitation of this vulnerability can lead to unauthorized access, data breaches, system crashes, or full system compromise.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time using just a manifest file like package-lock.json.
You can update tcpdump by running the command 'apk add tcpdump@4.9.0-r0' in your terminal.
References
Related vulnerabilities
Recent vulnerabilities recorded for tcpdump.
