CVE-2017-17669 : Exploit Details and Defense Strategies

Exiv2 version 0.26 is vulnerable to a heap-based buffer over-read in the pngchunk_int.cpp file, allowing for a denial of service attack via a specially crafted PNG file.

Understanding CVE-2017-17669

Exiv2 version 0.26 vulnerability leading to a denial of service attack.

What is CVE-2017-17669?

The vulnerability in Exiv2 version 0.26 allows an attacker to trigger a denial of service attack by exploiting a heap-based buffer over-read in the pngchunk_int.cpp file.

The Impact of CVE-2017-17669

This vulnerability can be exploited remotely by providing a malicious PNG file, resulting in a denial of service condition.

Technical Details of CVE-2017-17669

Details of the vulnerability in Exiv2 version 0.26.

Vulnerability Description

The issue lies in the function Exiv2::Internal::PngChunk::keyTXTChunk in the pngchunk_int.cpp file, leading to a heap-based buffer over-read.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions Affected: All versions are impacted.

Exploitation Mechanism

An attacker can exploit this vulnerability by providing a specifically crafted PNG file to trigger the heap-based buffer over-read.

Mitigation and Prevention

Ways to mitigate and prevent the CVE-2017-17669 vulnerability.

Immediate Steps to Take

Apply vendor patches or updates promptly.
Avoid opening untrusted PNG files.
Implement network security measures to prevent remote attacks.

Long-Term Security Practices

Regularly update software and dependencies.
Conduct security assessments and audits.
Educate users on safe browsing habits and file handling.

Patching and Updates

Check for patches from the vendor.
Update Exiv2 to a patched version to mitigate the vulnerability.