CVE-2024-21027: Oracle CMRO Authentication Bypass Vulnerability

CVE-2024-21027 Overview

CVE-2024-21027 affects the List of Values (LOV) component in Oracle Complex Maintenance, Repair, and Overhaul, part of Oracle E-Business Suite. An unauthenticated attacker with network access via HTTP can exploit the flaw if a legitimate user is tricked into interacting with attacker-supplied content. Successful exploitation permits unauthorized read, insert, update, or delete access to a subset of application data. The scope changes during exploitation, meaning impact can extend to additional Oracle products beyond the vulnerable component. Oracle addressed the issue in the April 2024 Critical Patch Update.

Critical Impact
Remote attackers can achieve limited data read and modification across Oracle Complex Maintenance, Repair, and Overhaul and related products following user interaction, without authentication.

Affected Products

Oracle Complex Maintenance, Repair, and Overhaul 12.2.3 through 12.2.13
Oracle E-Business Suite (LOV component)
Deployments exposing the CMRO web tier over HTTP

Discovery Timeline

2024-04-16 - CVE-2024-21027 published to NVD following Oracle's April 2024 Critical Patch Update
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-21027

Vulnerability Analysis

The vulnerability resides in the LOV (List of Values) component used by Oracle Complex Maintenance, Repair, and Overhaul within Oracle E-Business Suite. LOV widgets render dynamic selection lists tied to backend queries and often reflect user-supplied parameters into HTTP responses.

Oracle classifies the flaw with Confidentiality and Integrity impacts but no direct availability impact. The scope-change property indicates the vulnerable component can influence data outside its own security authority, extending consequences to other Oracle E-Business Suite modules that share the LOV surface.

The attack requires human interaction from a user other than the attacker. This aligns with a reflected client-side injection pattern where a victim must load an attacker-crafted URL or resource against the CMRO web tier. The MITRE CWE mapping is listed as NVD-CWE-noinfo, and Oracle does not publish component-level root cause information.

Root Cause

Oracle has not disclosed detailed root cause information for CVE-2024-21027. The Oracle Critical Patch Update advisory identifies the LOV component as the affected surface. The combination of network attack vector, no privileges required, user interaction required, and scope change is consistent with input handling weaknesses in the LOV rendering or parameter processing logic that permit cross-context injection or unauthorized data operations initiated on behalf of the interacting user.

Attack Vector

An unauthenticated attacker delivers a crafted HTTP request or URL targeting the CMRO LOV endpoint. A legitimate user must interact with the attacker-controlled content, for example by clicking a link or visiting an attacker-influenced page while authenticated to E-Business Suite. Upon interaction, the vulnerable LOV logic executes actions in the context of the victim, allowing limited read access and limited data modification across CMRO and adjacent Oracle products.

No verified proof-of-concept code is publicly available. See the Oracle Critical Patch Update April 2024 advisory for vendor guidance.

Detection Methods for CVE-2024-21027

Indicators of Compromise

HTTP requests to Oracle E-Business Suite LOV endpoints (paths containing OA.jsp, lov, or RF.jsp) that include unexpected parameter values or external referers
Authenticated user sessions performing insert, update, or delete operations on CMRO tables shortly after clicking external links
Unusual outbound HTTP requests from user browsers to the CMRO application immediately following email or chat-based interactions

Detection Strategies

Review Oracle E-Business Suite access logs for LOV requests with anomalous query strings, encoded payloads, or referer headers pointing to untrusted origins
Correlate web-tier logs with database audit records for CMRO schemas to identify unauthorized DML activity tied to short-lived user sessions
Baseline typical LOV request patterns and flag deviations in parameter length, character set, or invocation frequency per user

Monitoring Recommendations

Enable Oracle E-Business Suite application-tier auditing and forward logs to a centralized SIEM for retention and correlation
Monitor CMRO transaction tables for insert, update, and delete events performed outside standard business workflows
Alert on authenticated E-Business Suite sessions that follow immediately after users load external URLs referencing CMRO endpoints

How to Mitigate CVE-2024-21027

Immediate Actions Required

Apply the fixes delivered in the Oracle Critical Patch Update April 2024 to all affected Oracle E-Business Suite 12.2.3 through 12.2.13 environments
Inventory internet-exposed E-Business Suite instances and restrict access to the CMRO module to authenticated internal networks where feasible
Notify E-Business Suite users to avoid clicking unsolicited links referencing internal Oracle application URLs during the remediation window

Patch Information

Oracle released remediation for CVE-2024-21027 in the April 2024 Critical Patch Update. Administrators should follow the patch matrix published in the advisory and apply the corresponding CMRO and E-Business Suite technology stack updates for versions 12.2.3 through 12.2.13. Refer to the Oracle Critical Patch Update April 2024 advisory for patch identifiers and prerequisites.

Workarounds

Place the E-Business Suite web tier behind a reverse proxy or WAF that inspects and filters LOV request parameters for suspicious payloads
Restrict CMRO module access to a limited set of authenticated users and network segments until patches are validated in production
Enforce browser-side controls such as strict Content-Security-Policy headers and same-site cookie attributes on the E-Business Suite application tier

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# Configuration example - not applicable; apply the Oracle April 2024 CPU patches per vendor guidance