CVE-2017-17521 Explained : Impact and Mitigation

FontForge program, specifically the uiutil.c file, before version 20170731, is vulnerable to remote code execution via manipulated URLs.

Understanding CVE-2017-17521

This CVE identifies a security vulnerability in FontForge that could allow remote attackers to execute argument-injection attacks through a crafted URL.

What is CVE-2017-17521?

FontForge's uiutil.c file lacks proper string validation before launching programs specified by the BROWSER environment variable, enabling remote attackers to exploit the flaw.

The Impact of CVE-2017-17521

The vulnerability could lead to remote code execution by malicious actors through manipulated URLs.

Technical Details of CVE-2017-17521

FontForge's vulnerability is detailed below:

Vulnerability Description

FontForge's uiutil.c file lacks string validation before executing programs specified by the BROWSER environment variable.

Affected Systems and Versions

Product: FontForge
Vendor: N/A
Versions affected: Before version 20170731

Exploitation Mechanism

Remote attackers can exploit this vulnerability by injecting malicious arguments via manipulated URLs.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2017-17521:

Immediate Steps to Take

Update FontForge to version 20170731 or later to mitigate the vulnerability.
Avoid clicking on suspicious or untrusted URLs to prevent exploitation.

Long-Term Security Practices

Regularly update software and applications to patch known vulnerabilities.
Implement network security measures to detect and block malicious URL injections.
Educate users on safe browsing practices to minimize the risk of remote code execution.

Patching and Updates

Stay informed about security updates for FontForge and apply patches promptly to protect against known vulnerabilities.