CVE-2021-43691 Explained : Impact and Mitigation

tripexpress v1.1 is affected by a path manipulation vulnerability in file system/helpers/dompdf/load_font.php. The variable src is coming from $_SERVER["argv"] then there is a path manipulation vulnerability.

Understanding CVE-2021-43691

tripexpress v1.1 is vulnerable to path manipulation due to input validation issues in a specific PHP file.

What is CVE-2021-43691?

CVE-2021-43691 details a path manipulation vulnerability in tripexpress v1.1 in the file system/helpers/dompdf/load_font.php.

The Impact of CVE-2021-43691

The vulnerability allows an attacker to manipulate file paths, potentially leading to unauthorized access or arbitrary code execution.

Technical Details of CVE-2021-43691

tripexpress v1.1 is susceptible to a specific path manipulation issue.

Vulnerability Description

The vulnerability arises from the usage of user-controlled input ($_SERVER["argv"]) in a file path, enabling attackers to manipulate file operations.

Affected Systems and Versions

Systems running tripexpress v1.1
No specific vendor or product mentioned

Exploitation Mechanism

Attackers can exploit this vulnerability by manipulating the src parameter, leading to unauthorized file operations.

Mitigation and Prevention

Immediate mitigation steps include input validation and securing file operations.

Immediate Steps to Take

Validate and sanitize user inputs to prevent path manipulation.
Restrict file system access rights to limit potential damage.

Long-Term Security Practices

Implement secure coding practices to avoid similar vulnerabilities.
Regularly update and patch the application and its dependencies.

Patching and Updates

Ensure tripexpress v1.1 is updated to a secure version without the path manipulation vulnerability.