Buffer Over-read Vulnerability in tcpdump: CVE-2018-16227
Summary
ALPINE-CVE-2018-16227: The IEEE 802.11 parser in tcpdump before 4.9.3 has a buffer over-read in print-802_11.c for the Mesh Flags subfield. Affects tcpdump versions < 4.9.3-r0. Fixed in 4.9.3-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 the 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 4.9.3 are vulnerable to a buffer over-read issue, which can lead to potential information leaks.
Vulnerability Detail
The vulnerability identified as CVE-2018-16227 arises from a buffer over-read in the IEEE 802.11 parser within tcpdump. This issue occurs in the print-802_11.c file, specifically when handling the Mesh Flags subfield. An attacker could exploit this vulnerability to read sensitive information from memory, potentially leading to unauthorized access to network data. The CVSS score for this vulnerability is 7.5, indicating a high severity level, particularly concerning confidentiality and integrity.
How To Fix
Minimum fixed version
4.9.3-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 to analyze IEEE 802.11 packets until the package is updated to a secure version. Additionally, restricting access to tcpdump for untrusted users can mitigate potential exploitation.
Conclusion
In summary, CVE-2018-16227 is a significant vulnerability in tcpdump that can lead to buffer over-reads, exposing sensitive information. Users are strongly advised to update to version 4.9.3 or later to mitigate this risk. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2018-16227 is a vulnerability in tcpdump that allows for a buffer over-read, potentially exposing sensitive information.
You can check your tcpdump version by running 'tcpdump -V' in the command line. If it is below 4.9.3, it is affected.
The risks include unauthorized access to sensitive data transmitted over the network, which could lead to data breaches.
Yes, you can use Vulert, which monitors and alerts for open-source vulnerabilities in real-time using a manifest file like package-lock.json.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
References
Related vulnerabilities
Recent vulnerabilities recorded for tcpdump.
