CVE-2011-1902 in Protection Server
Summary
by MITRE
Directory traversal vulnerability in the web interface in Proofpoint Messaging Security Gateway 6.2.0.263:6.2.0.237 and earlier in Proofpoint Protection Server 5.5.3, 5.5.4, 5.5.5, 6.0.2, 6.1.1, and 6.2.0 allows remote attackers to read arbitrary files via unspecified vectors.
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Analysis
by VulDB Data Team • 08/05/2024
The CVE-2011-1902 vulnerability represents a critical directory traversal flaw affecting Proofpoint Messaging Security Gateway and Proofpoint Protection Server products. This vulnerability exists within the web interface component of these security appliances, creating a pathway for remote attackers to access arbitrary files on the underlying system. The affected versions span across multiple releases including Proofpoint Messaging Security Gateway 6.2.0.263:6.2.0.237 and earlier, alongside Proofpoint Protection Server versions 5.5.3, 5.5.4, 5.5.5, 6.0.2, 6.1.1, and 6.2.0, indicating a widespread issue affecting the product lineage. The vulnerability stems from insufficient input validation and improper handling of file path references within the web interface, allowing attackers to manipulate directory traversal sequences to access files outside the intended directory structure.
This directory traversal vulnerability operates through unspecified vectors that typically involve manipulation of file path parameters to navigate beyond the intended directory boundaries. Attackers can exploit this weakness by crafting malicious requests that include directory traversal sequences such as ../ or ..\, which when processed by the vulnerable web interface, can cause the system to access files in parent directories or even system-level locations. The technical implementation likely involves the web application failing to properly sanitize user-supplied input before using it in file operations, creating a direct path for unauthorized file access. This flaw aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
The operational impact of CVE-2011-1902 extends beyond simple unauthorized file access, potentially exposing sensitive system information, configuration files, and credentials that could facilitate further exploitation. An attacker exploiting this vulnerability could access critical system files, application configuration data, and potentially sensitive user information stored within the messaging security appliance. The implications are particularly severe given that these are security appliances designed to protect against malicious email traffic and network threats, making them prime targets for adversaries seeking to compromise the security infrastructure. The vulnerability essentially undermines the security posture of organizations relying on these appliances, as it allows attackers to bypass the intended security controls and access internal system resources.
Organizations affected by this vulnerability should implement immediate mitigations including applying the latest security patches provided by Proofpoint, which would address the directory traversal flaw in the web interface. Network segmentation and firewall rules should be implemented to restrict access to the vulnerable web interface from untrusted networks, limiting potential attack vectors. Additionally, implementing web application firewalls and input validation controls can help detect and prevent directory traversal attempts. The vulnerability demonstrates the importance of proper input validation and secure coding practices, particularly in web interfaces handling file operations, and aligns with ATT&CK technique T1566.001 for initial access through spearphishing attachments and T1078 for valid accounts usage. Regular security assessments and penetration testing should be conducted to identify similar vulnerabilities in other components of the security infrastructure, ensuring comprehensive protection against such directory traversal attacks.