CVE-2025-7824: Jinher OA XXE Vulnerability in XmlHttp.aspx

CVE-2025-7824 Overview

A vulnerability has been identified in Jinher OA version 1.1, specifically affecting the XmlHttp.aspx file. This issue involves improper handling of XML data, leading to an XML External Entity (XXE) reference vulnerability. The flaw allows attackers to manipulate XML input to reference external entities, potentially enabling unauthorized data access, server-side request forgery, or denial of service conditions. The attack can be initiated remotely over the network without requiring authentication, and the exploit has been publicly disclosed.

Critical Impact

Remote attackers can exploit this XXE vulnerability to read sensitive files, perform server-side request forgery (SSRF), or cause denial of service against vulnerable Jinher OA 1.1 installations without authentication.

Affected Products

• Jinher OA 1.1
• Systems running XmlHttp.aspx endpoint in Jinher OA

Discovery Timeline

• 2025-07-19 - CVE-2025-7824 published to NVD
• 2025-08-26 - Last updated in NVD database

Technical Details for CVE-2025-7824

Vulnerability Analysis

This XML External Entity (XXE) vulnerability exists in the XmlHttp.aspx component of Jinher OA 1.1. XXE attacks exploit weaknesses in XML parsers that process XML input containing references to external entities. When the XML parser is configured to resolve external entities, an attacker can craft malicious XML payloads that instruct the parser to fetch external resources, read local files, or make arbitrary network requests from the server's perspective.

The vulnerability is associated with CWE-611 (Improper Restriction of XML External Entity Reference) and CWE-610 (Externally Controlled Reference to a Resource in Another Sphere). These weaknesses indicate that the application fails to properly restrict or disable the processing of external entity references in XML documents submitted to the XmlHttp.aspx endpoint.

The network-accessible nature of this vulnerability combined with no authentication requirements makes it particularly concerning for organizations running exposed Jinher OA instances.

Root Cause

The root cause of this vulnerability lies in the improper configuration of the XML parser used by the XmlHttp.aspx file in Jinher OA 1.1. The parser does not adequately restrict the resolution of external entity references within XML documents. When processing user-supplied XML input, the application allows Document Type Definitions (DTDs) and external entity declarations to be processed, enabling attackers to define malicious external entities that reference internal files, external URLs, or other resources that should not be accessible.

Attack Vector

This vulnerability is exploitable remotely over the network. An attacker can submit specially crafted XML payloads containing external entity declarations to the vulnerable XmlHttp.aspx endpoint. The attack requires no prior authentication or user interaction, making it a direct attack vector against any network-accessible Jinher OA 1.1 installation.

A typical XXE attack against this endpoint would involve:

1. Crafting an XML payload with a malicious DOCTYPE declaration defining an external entity pointing to a sensitive file (e.g., /etc/passwd on Linux or C:\Windows\win.ini on Windows)
2. Submitting the crafted XML to the XmlHttp.aspx endpoint
3. The XML parser processes the external entity reference, retrieving and potentially returning the contents of the referenced resource
4. The attacker receives sensitive information in the response or observes out-of-band interactions

For detailed technical analysis and proof-of-concept information, refer to the GitHub Issue Discussion and VulDB entry #316925.

Detection Methods for CVE-2025-7824

Indicators of Compromise

• Unusual HTTP POST requests to XmlHttp.aspx containing DOCTYPE declarations or ENTITY definitions in the request body
• Server-side requests to unexpected external hosts originating from the Jinher OA application server
• Access attempts to sensitive system files (e.g., /etc/passwd, configuration files) from the web application process
• Error messages or responses containing file system paths or internal configuration data

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block XML payloads containing DOCTYPE declarations, ENTITY definitions, or SYSTEM keywords
• Monitor IIS/web server logs for requests to XmlHttp.aspx with suspicious XML content patterns
• Deploy network monitoring to detect outbound connections from the Jinher OA server to unexpected destinations
• Configure SIEM rules to alert on patterns consistent with XXE exploitation attempts against ASP.NET endpoints

Monitoring Recommendations

• Enable detailed logging on the XmlHttp.aspx endpoint to capture full request bodies for forensic analysis
• Implement file integrity monitoring on sensitive configuration files that could be targeted via XXE
• Monitor DNS queries from the Jinher OA server for unusual domain lookups that could indicate out-of-band XXE exploitation
• Review application logs regularly for XML parsing errors or entity resolution failures

How to Mitigate CVE-2025-7824

Immediate Actions Required

• Restrict network access to the XmlHttp.aspx endpoint using firewall rules or network segmentation
• Implement web application firewall rules to block XML payloads containing external entity references
• If the XmlHttp.aspx functionality is not required, disable or remove the endpoint entirely
• Audit any systems that may have been exposed to identify potential compromise

Patch Information

No official vendor patch information is currently available for CVE-2025-7824. Organizations should contact Jinher directly for security updates or consider implementing the workarounds below. Monitor the VulDB entry and vendor communications for patch availability announcements.

Workarounds

• Configure the .NET XML parser to disable DTD processing and external entity resolution by setting DtdProcessing = DtdProcessing.Prohibit and XmlResolver = null
• Place the Jinher OA application behind a reverse proxy or WAF that strips or rejects XML payloads with DOCTYPE declarations
• Implement input validation to reject XML documents containing entity declarations before they reach the XML parser
• Isolate the Jinher OA server from sensitive internal resources to limit the impact of potential SSRF attacks via XXE

For .NET applications, secure XML parser configuration typically involves disabling DTD processing:

// Secure XML reader configuration for .NET
XmlReaderSettings settings = new XmlReaderSettings();
settings.DtdProcessing = DtdProcessing.Prohibit;
settings.XmlResolver = null;