CVE-2007-3779 in GPG Plugin
Summary
by MITRE
PHP local file inclusion vulnerability in gpg_pop_init.php in the G/PGP (GPG) Plugin before 20070707 for Squirrelmail allows remote attackers to include and execute arbitrary local files, related to the MOD parameter.
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Analysis
by VulDB Data Team • 10/25/2017
The vulnerability identified as CVE-2007-3779 represents a critical local file inclusion flaw in the G/PGP plugin for Squirrelmail email client software. This security weakness exists in the gpg_pop_init.php script and affects all versions prior to 20070707, creating a significant attack surface for malicious actors seeking to compromise email systems. The vulnerability specifically targets the MOD parameter handling within the plugin's initialization process, allowing attackers to manipulate file inclusion operations and execute arbitrary code on the target system.
This flaw operates as a classic local file inclusion vulnerability where the application fails to properly validate user input before using it in file operations. The MOD parameter, which is intended to specify the module or function to be executed, becomes a vector for attackers to inject malicious file paths. When the application processes this parameter without adequate sanitization or validation, it can be coerced into including local files from unexpected locations, potentially leading to arbitrary code execution. The vulnerability falls under CWE-98, which specifically addresses Improper Input Validation leading to Local File Inclusion attacks, and aligns with ATT&CK technique T1190 for Exploit Public-Facing Application.
The operational impact of this vulnerability extends beyond simple code execution, as attackers can leverage it to gain unauthorized access to sensitive system resources and potentially escalate privileges. An attacker who successfully exploits this vulnerability could access private keys, read system files, modify email configurations, or even establish persistent backdoors within the email infrastructure. The attack surface is particularly concerning given that Squirrelmail is a widely deployed web-based email client used by numerous organizations, making this vulnerability a prime target for automated exploitation campaigns. The vulnerability's exploitation requires minimal privileges and can be executed through standard web browser interactions, making it particularly dangerous in environments where email systems are accessible to external users.
Mitigation strategies for CVE-2007-3779 should focus on immediate patching of the affected G/PGP plugin to version 20070707 or later, which contains the necessary input validation fixes. Organizations should also implement network-level restrictions to limit access to the Squirrelmail interface, particularly disabling unnecessary plugin functionality. Input validation should be enhanced through proper parameter sanitization, ensuring that the MOD parameter only accepts predefined, safe values. Additionally, implementing web application firewalls and security monitoring solutions can help detect and prevent exploitation attempts. The vulnerability highlights the importance of secure coding practices and proper input validation, particularly when handling user-supplied data in file operations. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other components of the email infrastructure, as this vulnerability demonstrates how seemingly minor input handling flaws can result in significant security breaches.