CVE-2009-1088 in Cascade
Summary
by MITRE
Hannon Hill Cascade Server 5.7 and other versions allows remote authenticated users to execute arbitrary programs or Java code via a crafted XSLT stylesheet with "extension elements and extension functions" that trigger code execution by Xalan-Java, as demonstrated using xalan://java.lang.Runtime.
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Analysis
by VulDB Data Team • 11/25/2024
The vulnerability identified as CVE-2009-1088 represents a critical code execution flaw within Hannon Hill Cascade Server version 5.7 and related releases. This security weakness stems from insufficient input validation and sanitization mechanisms within the server's processing of XSLT (Extensible Stylesheet Language Transformations) documents. The vulnerability specifically targets the Xalan-Java XSLT processor, which is responsible for transforming XML data using XSLT stylesheets. When authenticated users submit maliciously crafted XSLT documents containing extension elements and functions, the server processes these inputs without adequate security controls, creating an environment where arbitrary code execution becomes possible.
The technical exploitation of this vulnerability leverages the inherent capabilities of the Xalan-Java processor to execute extension functions that can interact with the underlying Java runtime environment. Attackers can craft XSLT stylesheets that utilize the xalan:// protocol to access Java runtime classes, particularly the java.lang.Runtime class, which provides methods for executing operating system commands. This allows remote authenticated attackers to execute arbitrary programs or Java code on the affected server with the privileges of the web application user. The vulnerability is classified as a code injection issue that operates at the transformation layer of XML processing, making it particularly dangerous as it can be triggered through legitimate XML processing workflows.
The operational impact of this vulnerability is severe and multifaceted, as it enables attackers to gain unauthorized access to the server environment and potentially escalate privileges. Successful exploitation can lead to complete system compromise, data theft, service disruption, and lateral movement within the network. The vulnerability affects organizations using Hannon Hill Cascade Server in web publishing environments where XSLT transformations are commonly used for content processing and presentation. Given that the attack requires only authenticated access, the threat surface is expanded to include both external attackers who can obtain legitimate credentials and internal malicious actors with authorized access. This makes the vulnerability particularly concerning for organizations with insufficient privilege controls or monitoring of authenticated user activities.
Organizations should implement multiple layers of defense to mitigate this vulnerability effectively. Immediate remediation involves applying vendor patches and upgrading to versions that address the XSLT processing flaws in the Xalan-Java component. Access controls should be strengthened through mandatory authentication requirements for XSLT uploads and comprehensive monitoring of XML processing activities. Input validation mechanisms must be enhanced to sanitize all XSLT content and reject potentially dangerous extension elements or functions. Network segmentation and principle of least privilege should be enforced to limit the potential damage from successful exploitation. Security monitoring should include detection of unusual XSLT processing patterns and attempts to access Java runtime classes through extension functions. This vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and relates to ATT&CK technique T1059, "Command and Scripting Interpreter," highlighting the execution of malicious code through legitimate system interfaces. Organizations should also consider implementing Web Application Firewalls and XML parsing security controls to prevent unauthorized XSLT content execution and reduce the attack surface for similar vulnerabilities.