Description

Use of uninitialized resource in Windows Event Logging Service allows an authorized attacker to disclose information locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.5",
  "pubDate": "2026-08-11T17:18:08.360Z",
  "pubdate": "2026-08-11T17:18:08.360Z",
  "executiveSummary": "The identified vulnerability involves the use of an uninitialized resource within the Windows Event Logging Service, classified as an information disclosure flaw.\nThis security defect allows an authorized local attacker to read sensitive system information that should otherwise be restricted.\nThe affected product is the Windows operating system, specifically targeting the core event logging infrastructure responsible for capturing and storing administrative, security, and application logs.\nThe risk implications include the potential exposure of sensitive memory contents or operational data, which could facilitate subsequent privilege escalation or reconnaissance phases by malicious actors.\nAttacker capabilities are constrained by prerequisites, requiring the adversary to possess local access and authorization to interact with the vulnerable logging service.\nExploitation requirements mandate that the attacker is already authenticated to the local system environment, enabling them to leverage the uninitialized resource flaw during routine or specially crafted application programming interface interactions with the service.",
  "technicalDetails": "The root cause of the vulnerability stems from improper initialization management within the Windows Event Logging Service codebase.\nSpecifically, when the service allocates or references internal resources, it fails to ensure that the underlying memory structures or operational handles are properly initialized before data is processed and returned to the caller.\nThe vulnerable component is the internal state handling mechanism of the Windows Event Logging Service, which processes local client requests.\nAuthentication requirements dictate that the attacker must be authenticated to the local operating system.\nPrivilege requirements are limited to an authorized user state, meaning standard local user privileges may be sufficient to interact with the exposed service interfaces.\nNetwork exposure is strictly local, as the attack vector does not involve remote network interfaces or protocols.\nThe exploitation method relies on the attacker invoking specific service routines that attempt to read from or interact with the uninitialized resource.\nBecause the resource contains residual data from previous memory operations, the lack of sanitization or zero-initialization allows the contents of the uninitialized memory block to be mirrored back to the caller.\nThe step-by-step attack flow involves the following phases: first, the authenticated attacker establishes communication with the Windows Event Logging Service via local inter-process communication channels or documented application programming interfaces.\nSecond, the attacker crafts a sequence of requests designed to target the code path handling the uninitialized resource.\nThird, the service executes the vulnerable routine, allocating or referencing the uninitialized memory block without overwriting stale data.\nFourth, the service inadvertently returns the residual memory contents containing sensitive information back to the attacker.\nThe post-exploitation impact centers entirely on local information disclosure, where the retrieved data may expose memory layouts, internal state structures, or sensitive operational artifacts useful for advanced threat actors performing local system reconnaissance."
}