CVE-2001-0126 in Oracle
Summary
by MITRE
Oracle XSQL servlet 1.0.3.0 and earlier allows remote attackers to execute arbitrary Java code by redirecting the XSQL server to another source via the xml-stylesheet parameter in the xslt stylesheet.
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Analysis
by VulDB Data Team • 10/08/2025
The vulnerability identified as CVE-2001-0126 resides within Oracle XSQL servlet version 1.0.3.0 and earlier implementations, representing a critical security flaw that enables remote code execution through improper input validation. This vulnerability specifically targets the xml-stylesheet parameter within XSLT stylesheets, creating an avenue for malicious actors to manipulate the XSQL server's behavior and redirect its processing to arbitrary sources. The flaw fundamentally stems from insufficient sanitization of user-supplied input, allowing attackers to inject malicious XSLT transformations that can execute arbitrary Java code on the vulnerable server. This represents a classic server-side request forgery vulnerability combined with code execution capabilities, making it particularly dangerous for web applications relying on Oracle XSQL servlet functionality.
The technical exploitation of this vulnerability occurs through the manipulation of the xml-stylesheet parameter which is designed to reference external XSLT stylesheet files. When an attacker crafts a malicious request containing a specially formatted xml-stylesheet attribute pointing to a controlled external resource, the XSQL servlet processes this reference without adequate validation. The servlet then retrieves and executes the referenced XSLT transformation, which can contain malicious code that executes within the Java runtime environment of the server. This process bypasses normal access controls and privilege boundaries, allowing attackers to execute arbitrary commands with the privileges of the web server process. The vulnerability aligns with CWE-94, which describes "Improper Control of Generation of Code ('Code Injection')" and specifically manifests as a code injection flaw in the XSLT processing pipeline.
The operational impact of CVE-2001-0126 extends beyond simple remote code execution, as it provides attackers with complete control over the affected Oracle XSQL servlet environment. Once exploited, adversaries can access sensitive data, modify application behavior, install backdoors, or use the compromised server as a pivot point for further attacks within the network. The vulnerability affects any system running Oracle XSQL servlet 1.0.3.0 or earlier versions, making it particularly concerning for enterprise environments where legacy systems may not be regularly updated. This vulnerability also aligns with ATT&CK technique T1059.007, "Command and Scripting Interpreter: XSL Scripting," which describes the use of XSL transformations for executing malicious code. The attack surface is particularly broad since XSLT processing is commonly used in web applications for document transformation, making this vulnerability exploitable across various Oracle XSQL implementations.
Mitigation strategies for CVE-2001-0126 primarily involve immediate patching of affected Oracle XSQL servlet installations to versions that properly validate and sanitize the xml-stylesheet parameter input. Organizations should implement strict input validation controls that prevent external references from being processed without explicit authorization and proper validation. Network-level controls including firewalls and web application firewalls can help limit access to XSQL servlet endpoints and monitor for suspicious xml-stylesheet parameter usage. Additionally, implementing proper access controls and privilege separation ensures that even if exploitation occurs, the impact is limited. Security monitoring should focus on detecting unusual XSLT processing patterns and external resource references. The vulnerability demonstrates the importance of validating all user-supplied input in server-side processing components and highlights the risks associated with allowing external resource references in transformation processes. Organizations should also consider implementing principle of least privilege access controls for XSQL servlet configurations and regularly review XSLT processing logic to prevent similar injection vulnerabilities.