CVE-2019-17263 : Security Advisory and Response

This CVE-2019-17263 article provides insights into a heap-based buffer over-read vulnerability in the libyal libfwsi library before October 6, 2019.

Understanding CVE-2019-17263

This section delves into the details of the vulnerability and its impact.

What is CVE-2019-17263?

CVE-2019-17263 is a heap-based buffer over-read issue in the libyal libfwsi library, specifically in the libfwsi_extension_block_copy_from_byte_stream function.

The Impact of CVE-2019-17263

The vulnerability allowed reading beyond the buffer's limits when encountering unsupported sizes, potentially leading to information disclosure or denial of service.

Technical Details of CVE-2019-17263

Explore the technical aspects of the vulnerability.

Vulnerability Description

The libfwsi_extension_block_copy_from_byte_stream function in libfwsi_extension_block.c permitted reading beyond buffer limits for unsupported sizes, with values 6 and 7 being unsupported.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions: Not applicable

Exploitation Mechanism

The issue arose due to the function only rejecting values less than 6, leaving values 6 and 7 vulnerable to heap-based buffer over-read.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2019-17263 vulnerability.

Immediate Steps to Take

Monitor vendor updates and patches
Implement network segmentation to limit exposure
Consider alternative libraries if patches are unavailable

Long-Term Security Practices

Regularly update software and libraries
Conduct security assessments and code reviews
Stay informed about security advisories

Patching and Updates

Apply patches and updates provided by the vendor to address the vulnerability.