Full Report
Microsoft has released patches to address two Critical-rated security flaws impacting Azure AI Face Service and Microsoft Account that could allow a malicious actor to escalate their privileges under certain conditions. The flaws are listed below - CVE-2025-21396 (CVSS score: 7.5) - Microsoft Account Elevation of Privilege Vulnerability CVE-2025-21415 (CVSS score: 9.9) - Azure AI Face Service
Analysis Summary
# Vulnerability: Critical Azure AI Face Service Authentication Bypass & Microsoft Account Privilege Escalation
## CVE Details
- CVE ID: CVE-2025-21415 (Azure AI Face Service) and CVE-2025-21396 (Microsoft Account)
- CVSS Score: 9.9 (Critical) for CVE-2025-21415; 7.5 (High) for CVE-2025-21396
- CWE: Not explicitly stated, but implied to be related to Authentication Bypass and Missing Authorization flaws.
## Affected Systems
- **Products:** Microsoft Azure AI Face Service and Microsoft Account.
- **Versions:** Not explicitly specified, but mitigated via updates.
- **Configurations:** N/A (Cloud service flaws).
## Vulnerability Description
The advisory details two distinct vulnerabilities:
1. **CVE-2025-21415 (CVSS 9.9):** An authentication bypass by spoofing vulnerability exists in the Azure AI Face Service. This flaw could allow an authorized attacker to escalate privileges over a network.
2. **CVE-2025-21396 (CVSS 7.5):** A missing authorization flaw in the Microsoft Account component could allow an unauthorized attacker to escalate privileges over a network.
## Exploitation
- **Status:** Microsoft indicates awareness of a **Proof-of-Concept (PoC) exploit code** for **CVE-2025-21415**. Both vulnerabilities are noted as fully mitigated.
- **Complexity:** Given the high CVSS score and PoC availability for the primary flaw, exploitation complexity is likely low to medium if unpatched.
- **Attack Vector:** Network
## Impact
The primary impact for both is **Elevation of Privilege (EoP)**.
- **Confidentiality:** Likely High (Successful EoP could lead to unauthorized data access).
- **Integrity:** Likely High (Successful EoP could lead to unauthorized modifications).
- **Availability:** Potentially High (Depending on the scope of escalated privileges achieved).
## Remediation
### Patches
Microsoft has released patches addressing both vulnerabilities. The advisory implies that these fixes have been deployed or are available and should be considered fully mitigated by Microsoft. Specific patch versions are not detailed in this summary source.
### Workarounds
No specific workarounds are listed, as Microsoft stated the flaws have been "fully mitigated."
## Detection
- **Indicators of Compromise:** Not specified in the source material. Potential IOCs would involve monitoring authentication logs and API calls related to the Azure AI Face Service for anomalous behavior or unexpected privilege escalation attempts.
- **Detection Methods and Tools:** Standard cloud security monitoring tools should be utilized to track access patterns against Azure services.
## References
- Microsoft Advisory for CVE-2025-21415: `https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21415`
- Microsoft Advisory for CVE-2025-21396: `https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21396`
- Microsoft Cloud Transparency Blog (Historical context): `https://msrc.microsoft.com/blog/2024/06/toward-greater-transparency-unveiling-cloud-service-cves/`