CVE-2011-0398 in Piwik
Summary
by MITRE
The Piwik_Common::getIP function in Piwik before 1.1 does not properly determine the client IP address, which allows remote attackers to bypass intended geolocation and logging functionality via (1) use of a private (aka RFC 1918) address behind a proxy server or (2) spoofing of the X-Forwarded-For HTTP header.
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Analysis
by VulDB Data Team • 10/11/2021
The vulnerability identified as CVE-2011-0398 resides within the Piwik web analytics platform version 1.1 and earlier, specifically within the Piwik_Common::getIP function implementation. This flaw represents a critical security oversight that fundamentally undermines the platform's ability to accurately identify client IP addresses, creating significant implications for both geolocation services and logging mechanisms. The vulnerability stems from the function's inadequate handling of IP address determination when requests pass through proxy servers or when malicious actors attempt to manipulate HTTP headers.
The technical flaw manifests in two primary attack vectors that exploit the function's insufficient validation mechanisms. The first vector involves the use of private IP addresses defined by RFC 1918 standards (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 ranges) that are commonly used in internal network environments behind proxy servers. When such addresses reach the Piwik platform, the flawed getIP function fails to properly extract the actual client IP address from the proxy chain, instead accepting the private address as legitimate. The second vector exploits the X-Forwarded-For HTTP header manipulation, where attackers can craft malicious headers to spoof their true IP addresses, bypassing the intended IP validation mechanisms that should prevent such deception.
This vulnerability directly impacts the operational integrity of Piwik's geolocation and logging capabilities, creating substantial security implications for organizations relying on accurate traffic analysis. The bypass of intended geolocation functionality means that analytics data becomes unreliable for geographic reporting, potentially leading to incorrect business decisions based on false traffic patterns. Additionally, the logging functionality becomes compromised as the system cannot accurately track genuine user locations, creating a false sense of security for administrators who depend on accurate IP-based logging for monitoring and threat detection purposes. The vulnerability essentially allows attackers to obfuscate their true locations and potentially evade detection systems that rely on IP address correlation.
The security implications extend beyond simple data integrity concerns, as this vulnerability aligns with several ATT&CK framework techniques including T1071.004 (Application Layer Protocol: DNS) and T1566 (Phishing) where attackers can manipulate network traffic to appear as legitimate users. From a CWE perspective, this vulnerability maps to CWE-284 (Improper Access Control) and CWE-352 (Cross-Site Request Forgery) due to the unauthorized modification of access control mechanisms and the potential for bypassing security controls. Organizations using vulnerable versions of Piwik face significant risks including data manipulation, unauthorized access to geolocation data, and compromised analytics integrity that could affect business intelligence and security monitoring systems.
The recommended mitigation strategy involves immediate upgrade to Piwik version 1.1 or later where this vulnerability has been addressed through proper IP address validation mechanisms. Administrators should also implement additional network-level controls including proper proxy header validation, network segmentation to prevent unauthorized IP spoofing, and enhanced monitoring of HTTP headers for suspicious patterns. Organizations should consider implementing IP address reputation systems and additional validation layers beyond the default Piwik functionality to ensure robust protection against similar vulnerabilities in the future. The fix in the patched version specifically addresses the improper handling of RFC 1918 addresses and implements proper validation of the X-Forwarded-For header to prevent spoofing attempts.