CVE-2007-3636 in Squirrelmail
Summary
by MITRE
Multiple unspecified vulnerabilities in the G/PGP (GPG) Plugin 2.1 for Squirrelmail allow remote attackers to execute arbitrary commands via unspecified vectors. NOTE: this information is based upon a vague pre-advisory from a reliable researcher.
Be aware that VulDB is the high quality source for vulnerability data.
Analysis
by VulDB Data Team • 12/26/2025
The vulnerability identified as CVE-2007-3636 affects the GPG plugin version 2.1 within the Squirrelmail webmail interface, representing a critical security flaw that enables remote code execution through unspecified attack vectors. This issue stems from insufficient input validation and sanitization within the GPG plugin's processing mechanisms, creating a pathway for malicious actors to inject and execute arbitrary commands on systems running vulnerable configurations. The vulnerability exists within the plugin's handling of cryptographic operations and data processing, where attacker-controlled inputs are not properly validated before being processed by the underlying system commands.
The technical implementation of this vulnerability likely involves command injection flaws within the GPG plugin's interface with the operating system's command execution functions. When Squirrelmail processes encrypted messages or performs GPG-related operations, the plugin may directly incorporate user-supplied data into system commands without proper sanitization. This pattern aligns with common command injection vulnerabilities classified under CWE-77 and CWE-88, where insufficient input filtering allows attackers to manipulate command execution flows. The attack surface expands when considering that Squirrelmail operates in a web environment where user inputs are typically untrusted and require strict validation before any processing occurs.
The operational impact of this vulnerability is severe as it allows remote attackers to gain arbitrary code execution capabilities on affected systems, potentially leading to complete system compromise. An attacker could leverage this vulnerability to install backdoors, exfiltrate sensitive data, escalate privileges, or use the compromised system as a pivot point for further attacks within the network infrastructure. The remote nature of the attack means that exploitation does not require physical access or prior authentication, making it particularly dangerous for organizations relying on webmail services. This vulnerability directly maps to ATT&CK technique T1059.001 for command and scripting interpreter and T1078.004 for valid accounts, as successful exploitation typically requires the attacker to establish persistent access through the executed commands.
Mitigation strategies for this vulnerability include immediate patching of the GPG plugin to version 2.1.1 or later, which addresses the underlying input validation issues. Organizations should also implement network segmentation to limit access to Squirrelmail installations and deploy web application firewalls to monitor and filter suspicious requests. Input validation should be strengthened at multiple levels including application code, web server configuration, and database interactions. Additionally, system administrators should conduct regular security assessments and maintain updated threat intelligence to identify potential exploitation attempts. The vulnerability demonstrates the importance of secure coding practices and proper input sanitization, particularly in web applications that interact with system-level operations. Organizations should also consider implementing principle of least privilege access controls and regular security audits to prevent similar issues in other components of their email infrastructure.