Memory Allocation Vulnerability in tcpdump: CVE-2020-8037
Summary
ALPINE-CVE-2020-8037: The ppp decapsulator in tcpdump 4.9.3 can be convinced to allocate a large amount of memory. Affects tcpdump versions < 4.9.3-r1. Fixed in 4.9.3-r1. 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. The tool is widely utilized by network administrators and security professionals for troubleshooting and monitoring network performance. However, tcpdump versions prior to 4.9.3-r1 are susceptible to a vulnerability that can lead to excessive memory allocation, potentially causing denial of service.
Vulnerability Detail
The vulnerability identified as CVE-2020-8037 affects the ppp decapsulator in tcpdump version 4.9.3. It can be exploited to allocate a significant amount of memory, which may lead to resource exhaustion and denial of service. This issue arises from improper handling of certain inputs, allowing attackers to manipulate the memory allocation process. The CVSS score for this vulnerability is 7.5, indicating a high severity level that necessitates prompt attention.
How To Fix
Minimum fixed version
4.9.3-r1
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 measure, if updating is not immediately feasible, consider limiting access to the tcpdump tool or monitoring its usage closely to prevent potential exploitation. Additionally, ensure that your network is secured against unauthorized access.
Conclusion
CVE-2020-8037 is a significant vulnerability in tcpdump that can lead to memory exhaustion and denial of service. It is crucial for users to update to the patched version 4.9.3-r1 to ensure their systems remain secure. Regular monitoring and usage of tools like Vulert can help maintain awareness of vulnerabilities in open-source software.
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FAQ
CVE-2020-8037 is a vulnerability in tcpdump that allows for excessive memory allocation, potentially leading to denial of service.
All versions of tcpdump prior to 4.9.3-r1 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If immediate updates are not possible, consider limiting access to tcpdump and monitoring its usage to reduce the risk of exploitation.
The CVSS score for CVE-2020-8037 is 7.5, indicating a high level of severity.
References
Related vulnerabilities
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