Description

IBM AIX 7.2, and 7.3 and IBM PowerVM VIOS 4.1 could allow a remote attacker to overwrite arbitrary files due to improper neutralization of special elements in input.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "9.1",
  "pubDate": "2026-08-20T15:17:28.963Z",
  "pubdate": "2026-08-20T15:17:28.963Z",
  "executiveSummary": "A vulnerability exists in IBM AIX 7.2 and 7.3, and IBM PowerVM VIOS 4.1, which allows a remote attacker to overwrite arbitrary files on the underlying file system. The root cause of the vulnerability stems from the improper neutralization of special elements in input, failing to properly sanitize or validate user-supplied data before it is processed by the affected system component. This security flaw introduces severe risk implications, as unauthorized file modification can lead to system instability, denial of service, data corruption, or potential privilege escalation if critical system binaries, configuration files, or startup scripts are systematically manipulated. The attacker capabilities include the ability to execute remote attacks targeting the vulnerable systems, leveraging improperly filtered input streams to direct file write operations to arbitrary destinations. Successful exploitation generally requires specific network exposure to the vulnerable service processing the unsanitized input, while exploitation requirements depend on the specific vector exposed by the affected components. Remediation requires applying the official vendor-supplied patches or interim fixes provided by IBM to properly neutralize special input elements and enforce strict input validation mechanisms across all affected AIX and PowerVM VIOS platforms.",
  "technicalDetails": "The vulnerability identified in IBM AIX 7.2, AIX 7.3, and IBM PowerVM VIOS 4.1 is classified as an arbitrary file overwrite flaw arising from the improper neutralization of special elements in input. This defect occurs within specific components of the operating system or virtualization platform that accept, parse, and process external or internal input strings without adequate validation or sanitization routines. When special characters, path traversal sequences, or control elements are embedded within the input vectors, the underlying application logic fails to restrict the scope of file I/O operations, thereby allowing the input to influence file system paths directly.\nThe root cause is rooted in inadequate input handling where boundary checks and path canonicalization are either missing or bypassed. Attackers can craft specialized input payloads containing directory traversal sequences or reserved characters that manipulate the destination path of write operations. The attack flow commences when a remote adversary sends a crafted payload across the network to the vulnerable service or daemon running on the targeted IBM AIX or PowerVM VIOS instance. Upon reception, the vulnerable component parses the input data insecurely, incorrectly interpreting the special elements embedded within the transmission.\nBecause the input is not properly neutralized, the application uses the tainted data to construct file paths or file descriptors used in subsequent write operations. Consequently, the payload behavior directs data to be written to arbitrary file system locations specified by the attacker, rather than the intended sandbox or temporary directory. Depending on the privileges associated with the execution context of the vulnerable process, the attacker can overwrite critical system files, configuration files, libraries, or administrative scripts.\nThe affected versions encompass IBM AIX 7.2, IBM AIX 7.3, and IBM PowerVM VIOS 4.1. Network exposure is present where the vulnerable service is reachable by the attacker, potentially requiring network access to specific ports or management daemons. Authentication and privilege requirements vary based on the specific entry point exposed by the vulnerable component, but the post-exploitation impact remains critical due to the capability to compromise file integrity, disrupt system operations, corrupt system state, or establish persistence via modification of execution binaries."
}