Critical Buffer Overflow Vulnerability in tcpdump: CVE-2016-7923
Summary
ALPINE-CVE-2016-7923: The ARP parser in tcpdump before 4.9.0 has a buffer overflow in print-arp.c:arp_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, software and communications protocol development, and education. However, tcpdump versions prior to 4.9.0 are vulnerable to a buffer overflow in the ARP parser, which can lead to severe security risks.
Vulnerability Detail
The vulnerability identified as CVE-2016-7923 arises from a buffer overflow in the ARP parser within tcpdump versions before 4.9.0. This flaw can be exploited by an attacker to execute arbitrary code, potentially leading to unauthorized access or control over the affected system. The vulnerability is particularly critical due to its high CVSS score of 9.8, indicating that it poses a significant risk to the confidentiality, integrity, and availability of the system.
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 tcpdump for ARP packet analysis until they can update to the patched version. Additionally, restricting access to the tcpdump tool can mitigate the risk of exploitation.
Conclusion
The buffer overflow vulnerability in tcpdump (CVE-2016-7923) poses a significant risk to users of the tool. It is crucial to update to the patched version (4.9.0 or later) to mitigate potential security threats. Users are encouraged to monitor their applications for vulnerabilities using tools like Vulert.
See every vulnerability recorded for tcpdump →
FAQ
CVE-2016-7923 is a vulnerability in tcpdump that allows for a buffer overflow, potentially enabling attackers to execute arbitrary code.
You can check your version of tcpdump by running 'tcpdump -v' in the command line. If your version is below 4.9.0, it is vulnerable.
Exploitation of this vulnerability can lead to unauthorized access, data breaches, and system control by attackers.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by vulnerabilities without requiring signup.
References
Related vulnerabilities
Recent vulnerabilities recorded for tcpdump.
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