Description

Integer overflow or wraparound in Microsoft Azure Attestation service and Device Health Attestation Service allows an unauthorized attacker to execute code over a network.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.1",
  "pubDate": "2026-08-11T17:19:13.353Z",
  "pubdate": "2026-08-11T17:19:13.353Z",
  "executiveSummary": "An integer overflow or wraparound vulnerability exists within the Microsoft Azure Attestation service and the Device Health Attestation Service. This memory safety flaw allows an unauthorized, remote attacker to execute arbitrary code over a network without requiring prior authentication or user interaction. The vulnerability poses severe risk implications, as the affected services handle critical trust and validation operations within cloud and device infrastructures. Successful exploitation compromises the integrity and confidentiality of the targeted attestation endpoints, potentially granting the adversary unauthorized code execution capabilities within the service execution context. The exploitation requirements rely on network accessibility to the vulnerable Microsoft Azure Attestation service or Device Health Attestation Service endpoints, enabling remote attackers to leverage crafted network packets to trigger the arithmetic overflow condition during input processing or buffer size calculations.",
  "technicalDetails": "The root cause of the vulnerability stems from an integer overflow or wraparound condition in the memory allocation or size calculation routines of the Microsoft Azure Attestation service and the Device Health Attestation Service. When the service parses specially crafted network inputs containing maliciously manipulated length or size parameters, the mathematical operation exceeds the maximum storable value for the designated integer type. This arithmetic overflow results in a wraparound, causing the allocation routine to reserve a significantly smaller memory buffer than required by the incoming data structure. Consequently, when the service attempts to copy or write the full payload into the undersized heap- or stack-allocated buffer, a classic buffer overflow condition occurs. The attack flow initiates when an unauthenticated, remote attacker transmits a specially formatted network request targeting the vulnerable components of the Microsoft Azure Attestation service or Device Health Attestation Service. Because the service exposes network interfaces to handle remote attestation requests, the attack surface is accessible over the network. Upon receiving the malicious payload, the vulnerable component processes the manipulated size fields, triggers the integer wraparound, and subsequently overwrites adjacent memory regions during the copy operation. This memory corruption can manipulate function pointers, return addresses, or critical application data structures. The post-exploitation impact includes arbitrary code execution within the security context of the affected service process, potentially allowing the adversary to pivot within the cloud infrastructure, escalate privileges, or subvert the cryptographic validation and device health verification guarantees provided by the services. Authentication and privilege requirements are absent, as the attack can be executed by an unauthorized network adversary."
}