CVE-2017-18244 : Exploit Details and Defense Strategies

A crafted aac file can cause a denial of service (out-of-bounds read) when processed by the stereo_processing function in Libav version 12.2. This vulnerability is related to the ff_ps_apply function.

Understanding CVE-2017-18244

This CVE identifies a vulnerability in Libav version 12.2 that can be exploited through a specially crafted aac file, leading to a denial of service due to an out-of-bounds read.

What is CVE-2017-18244?

The stereo_processing function in libavcodec/aacps.c in Libav 12.2 allows remote attackers to cause a denial of service (out-of-bounds read) via a crafted aac file, related to ff_ps_apply.

The Impact of CVE-2017-18244

Attackers can exploit this vulnerability to trigger a denial of service condition on systems running the affected version of Libav.

Technical Details of CVE-2017-18244

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability in Libav version 12.2 allows for an out-of-bounds read when processing a specially crafted aac file, potentially leading to a denial of service.

Affected Systems and Versions

Affected Version: Libav 12.2
Systems running Libav 12.2 are vulnerable to exploitation through crafted aac files.

Exploitation Mechanism

The vulnerability can be exploited by processing a maliciously crafted aac file using the stereo_processing function, ultimately leading to an out-of-bounds read.

Mitigation and Prevention

Protecting systems from CVE-2017-18244 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Libav to a non-vulnerable version to mitigate the risk of exploitation.
Avoid opening aac files from untrusted or unknown sources.

Long-Term Security Practices

Regularly update software and libraries to patch known vulnerabilities.
Implement network security measures to prevent malicious files from reaching systems.
Conduct regular security assessments and audits to identify and address potential vulnerabilities.

Patching and Updates

Stay informed about security updates for Libav and apply patches promptly to ensure protection against known vulnerabilities.