CVE-2024-11622: HPE Insight Remote Support XXE Vulnerability

CVE-2024-11622 Overview

CVE-2024-11622 is an XML External Entity (XXE) injection vulnerability affecting HPE Insight Remote Support. The flaw allows remote unauthenticated attackers to disclose sensitive information by submitting crafted XML payloads to the application. The vulnerability is tracked under CWE-91 (XML Injection) and CWE-611 (Improper Restriction of XML External Entity Reference). HPE published security bulletin hpesbgn04731en_us describing the issue and remediation guidance.

Critical Impact

Remote attackers can read arbitrary files and disclose internal information from systems running vulnerable versions of HPE Insight Remote Support without authentication.

Affected Products

• HPE Insight Remote Support (versions prior to the vendor-supplied patch)
• Deployments exposing the Insight Remote Support web interface to untrusted networks
• Enterprise environments using Insight Remote Support for HPE server telemetry and case management

Discovery Timeline

• 2024-11-26 - CVE-2024-11622 published to the National Vulnerability Database
• 2024-12-12 - Last updated in NVD database

Technical Details for CVE-2024-11622

Vulnerability Analysis

The vulnerability stems from improper restriction of XML external entity references in the XML parsing logic of HPE Insight Remote Support. The application processes XML input from remote clients without disabling Document Type Definition (DTD) processing or external entity resolution. An attacker can submit an XML document containing an external entity reference that the parser dereferences during processing.

The attack requires no authentication and no user interaction. Because Insight Remote Support typically runs with privileges sufficient to access local configuration data, the impact extends to disclosure of files readable by the service account. The vulnerability does not modify data or directly impact availability, consistent with the confidentiality-only impact profile.

Root Cause

The root cause is an XML parser configuration that permits resolution of external entities and DTDs in untrusted input. When the parser encounters a SYSTEM or PUBLIC external entity declaration, it fetches the referenced resource and substitutes its contents into the resulting document, which the application then echoes or processes in a way observable to the attacker.

Attack Vector

The attack vector is network-based. An attacker sends a crafted XML payload to an exposed Insight Remote Support endpoint that accepts XML. The payload declares an external entity referencing a local file using a file:// URI or an out-of-band URL hosted by the attacker. When the server parses the document, it resolves the entity and may return its contents in the response or leak it through a side channel such as DNS or HTTP callbacks. No verified proof-of-concept code has been published for this issue at the time of writing.

Detection Methods for CVE-2024-11622

Indicators of Compromise

• Inbound HTTP requests to Insight Remote Support endpoints containing <!DOCTYPE, <!ENTITY, or SYSTEM keywords in XML bodies
• Outbound network connections from the Insight Remote Support host to unexpected external domains shortly after XML request processing
• DNS lookups for attacker-controlled domains originating from the application server
• Application or web server logs showing XML payloads referencing file://, http://, or ftp:// URIs in entity declarations

Detection Strategies

• Inspect HTTP request bodies destined for the Insight Remote Support service for DOCTYPE and ENTITY declarations using web application firewall (WAF) signatures
• Correlate XML POST requests with subsequent outbound connections from the application host to identify out-of-band XXE exfiltration
• Review application error logs for XML parsing exceptions referencing unresolved entities or restricted file paths

Monitoring Recommendations

• Enable verbose logging on the Insight Remote Support web tier and forward logs to a centralized analytics platform
• Monitor egress traffic from management servers and alert on connections to non-HPE destinations
• Establish a baseline of normal XML request patterns and alert on deviations such as unusually large payloads or DOCTYPE declarations

How to Mitigate CVE-2024-11622

Immediate Actions Required

• Apply the patch referenced in HPE Security Bulletin hpesbgn04731en_us as soon as it is available for your version
• Restrict network access to the Insight Remote Support management interface to trusted administrative subnets only
• Audit recent application logs for XML payloads containing entity declarations to identify possible exploitation attempts

Patch Information

HPE has published security bulletin hpesbgn04731en_us containing the fixed versions and upgrade instructions. Administrators should consult the HPE Security Bulletin for the specific build numbers that address CVE-2024-11622 and follow the vendor-supplied upgrade procedure.

Workarounds

• Place the Insight Remote Support server behind a reverse proxy or WAF that strips or blocks XML payloads containing DOCTYPE or ENTITY declarations
• Apply network segmentation so the management host cannot initiate outbound connections to arbitrary internet destinations, preventing out-of-band XXE exfiltration
• Limit accounts and file permissions on the Insight Remote Support host to reduce the scope of data readable through file-disclosure attacks