CVE-2023-24189 in urule
Summary
by MITRE • 02/25/2023
An XML External Entity (XXE) vulnerability in urule v2.1.7 allows attackers to execute arbitrary code via uploading a crafted XML file to /urule/common/saveFile.
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Analysis
by VulDB Data Team • 10/20/2025
The CVE-2023-24189 vulnerability represents a critical XML External Entity processing flaw in the urule v2.1.7 software component that poses significant security risks to affected systems. This vulnerability exists within the file upload functionality of the application, specifically at the /urule/common/saveFile endpoint where the system fails to properly validate and sanitize XML content submitted by users. The flaw enables attackers to manipulate the application's XML parser behavior through crafted malicious XML files that reference external resources or entities, creating a pathway for unauthorized code execution and potential system compromise.
The technical implementation of this vulnerability stems from improper input validation and sanitization within the application's XML processing pipeline. When the urule application receives a crafted XML file through the saveFile endpoint, it processes the XML content without adequate protection against external entity references or malicious resource inclusion. This weakness aligns with CWE-611, which categorizes improper restriction of XML external entity references as a critical security flaw. The vulnerability exploits the inherent capabilities of XML parsers to resolve external entities, allowing attackers to leverage this functionality for malicious purposes including data exfiltration, internal network scanning, and arbitrary code execution on the target system.
The operational impact of CVE-2023-24189 extends beyond simple data theft to encompass full system compromise capabilities for attackers who successfully exploit this vulnerability. An attacker who gains the ability to upload malicious XML files can potentially execute arbitrary commands on the affected system, leading to complete system takeover. This vulnerability creates opportunities for lateral movement within networks as attackers can use the compromised system as a foothold to access other connected systems. The attack vector is particularly concerning because it leverages legitimate file upload functionality that is typically expected to be secure, making detection more difficult. According to ATT&CK framework category T1566, this vulnerability represents a technique for Initial Access through the exploitation of vulnerable file upload mechanisms, while the command execution aspect maps to T1059 for execution of malicious code.
Mitigation strategies for CVE-2023-24189 must address both immediate defensive measures and long-term architectural improvements to prevent similar vulnerabilities. Organizations should implement strict input validation and sanitization for all XML content, particularly when processing user-supplied data through file upload mechanisms. The most effective immediate fix involves disabling external entity resolution in XML parsers and implementing proper XML schema validation to prevent malicious content from being processed. Additionally, organizations should restrict file upload capabilities to only accept known safe formats and implement content-type checking alongside file extension validation. Network-level protections such as web application firewalls should be configured to monitor and block suspicious XML content patterns. The remediation process should also include comprehensive code review to ensure that XML processing components properly handle external entity references and that appropriate security controls are in place to prevent XXE attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other application components that might be susceptible to the same class of vulnerabilities.