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CVE-2017-12999 : Exploit Details and Defense Strategies

Learn about CVE-2017-12999, a buffer over-read vulnerability in tcpdump versions prior to 4.9.2. Find out how to mitigate the issue and protect your systems.

In the print-isoclns.c file within tcpdump, a buffer over-read issue exists in the IS-IS parser, specifically in the isis_print() function. This vulnerability affects tcpdump versions prior to 4.9.2.

Understanding CVE-2017-12999

What is CVE-2017-12999?

The IS-IS parser in tcpdump before version 4.9.2 is susceptible to a buffer over-read in print-isoclns.c:isis_print().

The Impact of CVE-2017-12999

This vulnerability could allow an attacker to exploit the buffer over-read issue, potentially leading to information disclosure or denial of service.

Technical Details of CVE-2017-12999

Vulnerability Description

The buffer over-read vulnerability is present in the IS-IS parser within the isis_print() function of tcpdump versions prior to 4.9.2.

Affected Systems and Versions

        Product: N/A
        Vendor: N/A
        Versions Affected: All versions of tcpdump before 4.9.2

Exploitation Mechanism

The vulnerability can be exploited by crafting a malicious IS-IS packet to trigger the buffer over-read in the isis_print() function.

Mitigation and Prevention

Immediate Steps to Take

        Update tcpdump to version 4.9.2 or later to mitigate the vulnerability.
        Monitor vendor advisories and security sources for patches and updates.

Long-Term Security Practices

        Regularly update software and apply security patches promptly.
        Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

        Apply the latest patches and updates from the tcpdump project to address the buffer over-read issue.

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