Description

Improper link resolution before file access ('link following') in Windows Management Services allows an authorized attacker to deny service locally.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.5",
  "pubDate": "2026-08-11T17:19:12.513Z",
  "pubdate": "2026-08-11T17:19:12.513Z",
  "executiveSummary": "A vulnerability classified as improper link resolution before file access, commonly known as link following, has been identified in Windows Management Services. This vulnerability enables an authorized local attacker to induce a denial of service condition on the targeted system. The flaw arises from insecure file handling practices where symbolic links or hard links are improperly resolved, leading to unintended file system interactions.\nThe primary impact of this vulnerability is the disruption of service availability, preventing legitimate users and administrative processes from interacting with affected Windows Management Services components. Exploitation of this security defect requires local system access and authorization, meaning an attacker must already possess valid credentials or execution capabilities on the local machine.\nFrom a risk perspective, while the vulnerability is restricted to local exploitation and does not directly facilitate remote code execution or privilege escalation, it compromises overall system reliability and service availability. Remediation depends on applying vendor-supplied security updates or implementing strict file system access controls to prevent unauthorized link creation in sensitive directories utilized by the management services.",
  "technicalDetails": "The vulnerability stems from improper link resolution before file access within Windows Management Services. This security issue is fundamentally a race condition or logic flaw involving Time-of-Check to Time-of-Use (TOCTOU) during file system operations, specifically concerning how symbolic links, junction points, or hard links are traversed and evaluated prior to opening or modifying files.\nThe vulnerable component is the file handling routine within Windows Management Services, which fails to securely validate target paths when processing file access requests. Because the service processes file input without adequately checking if the target resolves to a restricted system file or an unintended location, an authorized local attacker can manipulate file system references.\nThe exploitation method relies on the creation of crafted symbolic links or directory junctions within a directory monitored or accessed by the service. When Windows Management Services attempts to read, write, or create a file, it follows the attacker-controlled link. This improper link resolution forces the service to interact with unintended file paths, resulting in resource exhaustion, file locking conflicts, or application crashes.\nRegarding attack prerequisites, the attacker must possess local access to the target host and authorization to interact with the system or create links in specific accessible directories. The attack vector is strictly local, requiring no network exposure or remote interaction. Authentication is required to establish the local session, and specific local privileges may be necessary depending on the exact directories targeted for link placement.\nThe payload behavior during a successful exploit manifests as a localized denial of service. By redirecting file operations to critical system resources, device nodes, or causing recursive link loops, the attacker causes the service to hang, fault, or terminate unexpectedly. Post-exploitation impact is limited to service disruption and does not inherently provide data exfiltration or arbitrary code execution capabilities, though subsequent instability can affect system management operations."
}