Buffer Overflow Vulnerability in tcpdump: CVE-2016-7993
Summary
ALPINE-CVE-2016-7993: A bug in util-print.c:relts_print() in tcpdump before 4.9.0 could cause a buffer overflow in multiple protocol parsers (DNS, DVMRP, HSRP, IGMP, lightweight resolver protocol, PIM). 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 network diagnostics. However, prior to version 4.9.0, tcpdump contained a critical vulnerability that could lead to severe security risks.
Vulnerability Detail
A bug in util-print.c:relts_print() in tcpdump versions before 4.9.0 could cause a buffer overflow in multiple protocol parsers, including DNS, DVMRP, HSRP, IGMP, lightweight resolver protocol, and PIM. This vulnerability arises from improper handling of input data, which could allow an attacker to exploit the flaw and execute arbitrary code, potentially leading to unauthorized access or denial of service. The CVSS score for this vulnerability is 9.8, indicating a high severity level.
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 limit the exposure of tcpdump by restricting its execution to trusted networks and users until the package can be updated. Additionally, consider using alternative tools for packet analysis that do not exhibit this vulnerability.
Conclusion
The tcpdump vulnerability CVE-2016-7993 poses significant risks due to a buffer overflow issue in its protocol parsers. Users are strongly advised to update to the latest patched version to mitigate these risks. For those unable to update immediately, implementing workarounds can help reduce exposure until a proper fix is applied.
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FAQ
CVE-2016-7993 is a vulnerability in tcpdump that can lead to a buffer overflow, affecting multiple protocol parsers.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without any signup.
The risks include potential unauthorized access, execution of arbitrary code, and denial of service due to the buffer overflow.
Yes, the vulnerability is patched in tcpdump version 4.9.0-r0 and later.
If immediate updates are not possible, restrict the use of tcpdump to trusted environments and consider using alternative packet analysis tools.
References
Related vulnerabilities
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