Description

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to manipulate database transactions due to improper authorization in the DDM target dispatcher.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.1",
  "pubDate": "2026-09-04T17:16:56.010Z",
  "pubdate": "2026-09-04T17:16:56.010Z",
  "executiveSummary": "A critical vulnerability exists within the Distributed Data Management (DDM) target dispatcher of IBM i versions 7.3, 7.4, 7.5, and 7.6. The flaw stems from improper authorization controls, which can be leveraged by a remote attacker to manipulate database transactions.\nThis vulnerability constitutes an authorization bypass that undermines the integrity of database operations. An attacker with network access to the DDM service can perform unauthorized transaction modifications without the required credentials or permission levels, effectively bypassing existing security access control lists.\nThe risk implication is significant, as successful exploitation results in a total loss of data integrity within the target IBM i environment. The vulnerability is exploitable remotely, requiring no prior authentication or administrative privileges on the target system. Given the nature of DDM, which is frequently exposed in enterprise networked environments to facilitate inter-system communication, the potential for unauthorized data manipulation is severe. Organizations relying on DDM for transactional integrity must treat this as a high-priority exposure to prevent malicious interference with mission-critical database assets.",
  "technicalDetails": "The vulnerability resides in the DDM target dispatcher component of the IBM i operating system, which is responsible for managing incoming requests from remote systems participating in DDM conversations. The DDM architecture relies on a structured protocol to facilitate record-level access and file management across networked IBM i systems. The root cause is a failure in the authorization verification logic within the dispatcher itself, which fails to correctly validate the requester's permissions against the target database resource before processing transaction commands.\nDuring the standard DDM interaction flow, a remote client initiates a session with the host server. The target dispatcher is tasked with evaluating the validity of the incoming request and ensuring that the associated user profile possesses the necessary authorization to perform the requested CRUD (Create, Read, Update, Delete) operations on the specified database files or members.\nExploitation occurs when an attacker crafts a malicious DDM packet that bypasses the secondary authorization checks traditionally enforced by the system-wide security framework. By manipulating the transaction-level parameters within the DDM stream, an attacker can coerce the dispatcher into executing operations on behalf of the attacker, even if the credentials supplied do not strictly map to the required privileges for the specific database object. The dispatcher essentially trusts the malformed instruction set presented in the DDM session, leading to an unauthorized state where the attacker can modify, delete, or inject data into sensitive database tables.\nThis exposure is exacerbated by the fact that DDM communications typically occur over non-encrypted or insufficiently authenticated channels. Because the dispatcher acts as the gateway for remote requests, it operates with the authority of the intercepted process, allowing for widespread manipulation if the system architecture permits DDM traffic across network boundaries. Once the attacker successfully exploits the dispatcher, they can perform arbitrary transaction manipulations, leading to a direct compromise of data integrity. The lack of robust validation in the DDM target dispatcher allows for a stealthy attack vector where the system perceives the malicious instructions as legitimate, high-privilege transaction requests, thereby bypassing standard security auditing mechanisms that might otherwise trigger alerts for unauthorized file access."
}