CVE-2024-39598 Overview
CVE-2024-39598 is a Server-Side Request Forgery (SSRF) vulnerability in the SAP Customer Relationship Management (CRM) WebClient UI Framework. An authenticated attacker can craft specific HTTP requests that force the application to enumerate accessible HTTP endpoints on the internal network. Successful exploitation results in information disclosure about internal infrastructure, though the flaw does not affect integrity or availability. The vulnerability is classified under [CWE-918] (Server-Side Request Forgery) and affects multiple releases of SAP CRM S4FND and WebClient UI components.
Critical Impact
Authenticated attackers can leverage the SAP CRM WebClient UI as a proxy to probe internal HTTP services, revealing network topology and potentially exposing sensitive internal endpoints not intended for external reach.
Affected Products
- SAP Customer Relationship Management S4FND versions 102, 103, 104, 105, 106, 107, 108
- SAP Customer Relationship Management WebClient UI versions 701, 731, 746, 747, 748
- SAP Customer Relationship Management WebClient UI versions 800, 801
Discovery Timeline
- 2024-07-09 - CVE-2024-39598 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-39598
Vulnerability Analysis
The SAP CRM WebClient UI Framework processes user-supplied HTTP request parameters that influence outbound HTTP calls made by the server. When an authenticated attacker manipulates these inputs, the framework issues requests to attacker-controlled URLs from the perspective of the SAP application server. This creates an SSRF primitive that lets adversaries pivot from a low-privileged CRM session into the internal network. Response differentials (status codes, timing, and content length) reveal whether specific internal HTTP endpoints exist and respond. The vulnerability yields high confidentiality impact and a scope change because the vulnerable component (WebClient UI) can reach resources beyond its own security authority.
Root Cause
The root cause is missing validation of destination URLs and hostnames within HTTP request-handling code paths of the WebClient UI Framework. The application does not enforce an allowlist of legitimate downstream endpoints, nor does it restrict requests to internal address ranges or metadata services. Any authenticated CRM user with access to the vulnerable request flow can substitute arbitrary target URLs.
Attack Vector
The attack is executed over the network by an authenticated user with low privileges and requires no user interaction. The attacker submits crafted HTTP requests through legitimate SAP CRM WebClient UI entry points. Each request specifies an internal URL, and the SAP server issues that request on the attacker's behalf. By iterating through IP ranges and common ports, an attacker enumerates reachable HTTP services, internal admin panels, and potentially cloud metadata endpoints if the SAP instance runs in a cloud environment.
Because no verified proof-of-concept code exists in public repositories, technical exploitation details are described in prose only. See the SAP Note #3467377 for vendor-specific technical details.
Detection Methods for CVE-2024-39598
Indicators of Compromise
- Outbound HTTP requests originating from the SAP CRM application server to unexpected internal IP ranges or non-standard ports.
- High volume of requests from a single authenticated CRM session containing URL-like parameters or fully qualified hostnames.
- Application logs showing repeated HTTP requests with varying destination hosts within short time windows, indicating enumeration behavior.
- Access attempts from the SAP server to cloud metadata endpoints such as 169.254.169.254 when running in IaaS environments.
Detection Strategies
- Correlate SAP application logs with network flow data to identify server-initiated HTTP traffic to internal targets that fall outside documented integration patterns.
- Baseline legitimate outbound HTTP destinations for the CRM server and alert on deviations, especially connections to RFC1918 addresses not previously seen.
- Inspect HTTP request parameters submitted to WebClient UI endpoints for URL-encoded internal addresses, IP literals, or hostname patterns.
Monitoring Recommendations
- Enable verbose logging on SAP Web Dispatcher and ICM (Internet Communication Manager) to capture outbound request URLs and source user context.
- Forward SAP audit logs and network telemetry to a centralized analytics platform for correlation and long-term retention.
- Monitor authenticated user sessions for anomalous request rates against WebClient UI endpoints and flag accounts issuing enumeration-like patterns.
How to Mitigate CVE-2024-39598
Immediate Actions Required
- Apply the SAP security patch referenced in SAP Note #3467377 to all affected CRM S4FND and WebClient UI installations.
- Review authentication logs and CRM user activity for signs of enumeration prior to patch deployment.
- Restrict outbound network egress from the SAP CRM application server to only required downstream services using network-layer allowlisting.
Patch Information
SAP addressed CVE-2024-39598 as part of the July 2024 SAP Security Patch Day. Administrators should consult SAP Security Patch Day for the full patch bundle and review SAP Note #3467377 for component-specific instructions covering S4FND versions 102 through 108 and WebClient UI versions 701 through 801.
Workarounds
- Enforce strict egress firewall rules on the SAP application server, denying arbitrary outbound HTTP traffic to internal subnets.
- Restrict authenticated CRM access to trusted users and reduce role assignments granting access to affected WebClient UI request handlers.
- Deploy a forward proxy with URL allowlisting between the SAP server and any downstream HTTP dependencies to constrain reachable destinations.
- Monitor and rate-limit HTTP requests submitted to WebClient UI endpoints to reduce the feasibility of large-scale enumeration.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
