CVE-2003-0636 in iChain
Summary
by MITRE
Novell iChain 2.2 before Support Pack 1 does not properly verify that URL redirects match the DNS name of an accelerator, which allows attackers to redirect URLs to malicious web sites.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 06/15/2018
The vulnerability identified as CVE-2003-0636 affects Novell iChain 2.2 before Support Pack 1, representing a critical security flaw in the web application firewall and accelerator platform. This issue stems from inadequate validation mechanisms within the URL redirect functionality, specifically failing to verify that redirect destinations align with the expected DNS names of accelerators. The vulnerability exists in the core URL handling logic where the system accepts redirects without proper domain validation, creating a pathway for malicious actors to exploit the configuration.
This technical flaw operates at the application layer and represents a variant of improper input validation, specifically categorized under CWE-20 as "Improper Input Validation." The vulnerability allows attackers to craft malicious URLs that appear legitimate but redirect users to unauthorized destinations. The implementation fails to perform proper hostname verification during redirect processing, enabling attackers to substitute their own domains for legitimate accelerator hostnames in redirect operations. This creates a man-in-the-middle scenario where users are unknowingly directed to malicious sites while maintaining the appearance of legitimate communication with the original domain.
The operational impact of this vulnerability extends beyond simple redirection attacks, as it can facilitate sophisticated phishing campaigns and credential theft operations. Attackers can leverage this flaw to create convincing redirect chains that bypass user suspicion, particularly when targeting enterprise environments where iChain appliances serve as security gateways. The vulnerability affects the integrity of the security infrastructure by allowing malicious redirects to bypass the platform's intended protection mechanisms. Organizations relying on iChain for web access control and security enforcement face significant risk as this flaw undermines the trust model that the platform is designed to maintain, potentially allowing attackers to circumvent security policies and gain unauthorized access to sensitive resources.
Mitigation strategies for CVE-2003-0636 require immediate implementation of the available support pack updates from Novell, which address the core validation logic. Organizations should also implement additional network-level controls including firewall rules that restrict outbound redirect traffic and DNS monitoring to detect unauthorized domain usage. The vulnerability aligns with ATT&CK technique T1189 "Drive-by Compromise" and T1566 "Phishing" as it enables attackers to redirect users to malicious sites through seemingly legitimate URLs. Network administrators should deploy URL filtering solutions that can detect and block suspicious redirect patterns, while also implementing proper logging and monitoring of redirect operations to identify potential exploitation attempts. The fundamental fix involves strengthening the hostname verification process within the iChain platform to ensure all redirect destinations match expected DNS patterns before execution, thereby preventing the arbitrary redirection that enables this class of attack.