CVE-2011-3694 in Enterprise Messenger Server
Summary
by MITRE
The Server Administration Console in NetSaro Enterprise Messenger Server 2.0 allows remote attackers to read application source code by appending a %00 character to a URL.
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Analysis
by VulDB Data Team • 11/20/2021
The vulnerability described in CVE-2011-3694 represents a classic case of improper input validation and insecure direct object reference in web applications. This flaw exists within the Server Administration Console component of NetSaro Enterprise Messenger Server version 2.0, specifically exposing a path traversal vulnerability that allows remote attackers to access sensitive application source code. The vulnerability manifests when a malicious actor appends a null byte character %00 to a URL, which exploits a weakness in how the application processes file paths and handles input validation.
The technical exploitation of this vulnerability stems from a lack of proper sanitization of user-supplied input within the web application's URL handling mechanism. When the application receives a request containing the null byte terminator, it fails to properly validate or sanitize the input before processing it as part of a file path lookup operation. This allows an attacker to manipulate the application's file access behavior and potentially retrieve source code files that should remain protected within the application's directory structure. The null byte injection technique leverages the way certain web servers and applications interpret null terminators in file paths, effectively bypassing normal access controls and directory traversal restrictions.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with access to application source code that may contain sensitive implementation details, database connection strings, cryptographic keys, or other confidential information. This exposure can significantly aid attackers in planning more sophisticated attacks against the system, including potential exploitation of other vulnerabilities present in the application's codebase. The remote nature of the attack means that an attacker does not require physical access or local system credentials to exploit this vulnerability, making it particularly dangerous in enterprise environments where such applications may be exposed to untrusted networks.
From a cybersecurity perspective, this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, and also relates to CWE-77, which covers improper neutralization of special elements used in a command. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under T1068, which covers 'Exploitation for Privilege Escalation', and T1566, which covers 'Phishing with Malicious Attachments'. Organizations should consider implementing comprehensive input validation controls, proper access controls, and regular security assessments to prevent such vulnerabilities from being exploited in production environments. The recommended mitigation strategies include implementing strict input validation to reject null byte characters in URL parameters, applying proper access controls to administrative interfaces, and ensuring that source code files are not accessible through web directories.