CVE-2001-1455 in SiteMinder
Summary
by MITRE
Netegrity SiteMinder 3.6 through 4.5.1 allows remote attackers to bypass filtering via URLs containing Unicode characters.
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Analysis
by VulDB Data Team • 11/17/2024
The vulnerability identified as CVE-2001-1455 affects Netegrity SiteMinder versions 3.6 through 4.5.1, representing a significant security flaw in web application security enforcement mechanisms. This issue stems from improper handling of Unicode characters within URL processing, creating a pathway for malicious actors to circumvent established access controls and security policies. The vulnerability specifically targets the authentication and authorization systems that rely on URL-based filtering to protect sensitive resources and administrative functions within web applications.
The technical root cause of this vulnerability lies in the inadequate validation and sanitization of Unicode sequences within URL parsing routines. When SiteMinder processes incoming requests containing Unicode characters, the system fails to properly normalize or validate these sequences, allowing attackers to craft malicious URLs that bypass intended security restrictions. This occurs because the application's input validation mechanisms do not account for the various ways Unicode characters can be represented or encoded, particularly when these characters are embedded within URL paths or query parameters. The flaw operates at the protocol level where Unicode normalization is insufficient, enabling attackers to exploit encoding variations to manipulate access control decisions.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security model of applications protected by SiteMinder. Attackers can leverage this weakness to access restricted resources, bypass authentication mechanisms, and potentially gain unauthorized administrative access to protected systems. The remote nature of the attack vector means that adversaries do not require physical access or local system privileges to exploit this vulnerability, making it particularly dangerous in networked environments where applications are exposed to untrusted users. This vulnerability directly violates the principle of least privilege and can result in data breaches, unauthorized system access, and complete compromise of protected applications.
Security professionals should consider this vulnerability in the context of CWE-180, which addresses flawed input validation that fails to properly handle special characters including Unicode sequences. The attack pattern aligns with ATT&CK technique T1078.004, which covers valid accounts with privileges that are used to bypass access controls, particularly when the bypass occurs through manipulation of URL parameters. Organizations should implement immediate mitigations including patching to the latest available versions of SiteMinder, implementing additional input validation layers, and deploying web application firewalls that can detect and block suspicious Unicode sequences in URLs. The vulnerability also underscores the importance of proper Unicode handling in security-critical applications and highlights the need for comprehensive testing of international character support in security enforcement mechanisms.