CVE-2017-11684 : Exploit Details and Defense Strategies

A remote denial of service vulnerability exists in Libav 12.1 due to illegal address access in the build_table function of libavcodec/bitstream.c.

Understanding CVE-2017-11684

This CVE involves a flaw that can lead to a denial of service attack through specially crafted input.

What is CVE-2017-11684?

The vulnerability in Libav 12.1 allows for illegal address access in the build_table function, potentially resulting in a remote denial of service.

The Impact of CVE-2017-11684

The vulnerability can be exploited by an attacker to cause a denial of service condition on systems running the affected version of Libav.

Technical Details of CVE-2017-11684

This section provides more technical insights into the vulnerability.

Vulnerability Description

The build_table function in libavcodec/bitstream.c of Libav 12.1 allows for illegal address access, leading to a remote denial of service when processing malicious input.

Affected Systems and Versions

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Exploitation Mechanism

The vulnerability can be exploited by crafting specific input that triggers the illegal address access in the build_table function.

Mitigation and Prevention

Protecting systems from CVE-2017-11684 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches or updates provided by the vendor to address the vulnerability.
Implement network-level controls to filter out potentially malicious traffic.
Monitor system logs for any unusual activities that could indicate an exploitation attempt.

Long-Term Security Practices

Regularly update software and libraries to ensure known vulnerabilities are patched.
Conduct security assessments and penetration testing to identify and remediate weaknesses in the system.

Patching and Updates

Ensure that the latest patches or updates from Libav are applied to mitigate the CVE-2017-11684 vulnerability.