CVE-2019-9719 : Exploit Details and Defense Strategies
Learn about CVE-2019-9719, a vulnerability in Libav 12.3 allowing attackers to corrupt the stack via a crafted video file in Matroska format. Find mitigation steps and prevention measures here.
An exploit in the subtitle decoder within Libav 12.3 has been discovered, allowing the stack to be manipulated when processing a specially crafted video file in Matroska format. Some parties challenge the classification of this as a vulnerability, arguing that no concrete evidence has been presented.
Understanding CVE-2019-9719
This CVE involves a stack-based buffer overflow in the subtitle decoder in Libav 12.3.
What is CVE-2019-9719?
CVE-2019-9719 is a vulnerability in Libav 12.3 that allows attackers to corrupt the stack via a crafted video file in Matroska format due to a misuse of snprintf in srt_to_ass within libavcodec/srtdec.c.
The Impact of CVE-2019-9719
The vulnerability can be exploited by attackers to manipulate the stack, potentially leading to a compromise of the affected system.
Technical Details of CVE-2019-9719
This section provides more technical insights into the CVE.
Vulnerability Description
A stack-based buffer overflow in the subtitle decoder in Libav 12.3 allows attackers to corrupt the stack via a crafted video file in Matroska format due to the misuse of snprintf in srt_to_ass within libavcodec/srtdec.c.
Affected Systems and Versions
- Product: N/A
- Vendor: N/A
- Version: N/A
Exploitation Mechanism
The vulnerability can be exploited by processing a specially crafted video file in Matroska format, triggering the stack manipulation.
Mitigation and Prevention
Protecting systems from CVE-2019-9719 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply security patches provided by the vendor promptly.
- Avoid opening or processing suspicious video files from untrusted sources.
Long-Term Security Practices
- Regularly update software and firmware to the latest versions.
- Implement network segmentation and access controls to limit the impact of potential attacks.
- Conduct regular security assessments and penetration testing to identify and address vulnerabilities.
Patching and Updates
Ensure that all systems running Libav 12.3 are updated with the latest patches to mitigate the CVE-2019-9719 vulnerability.