Description
Milvus Proxy has a Critical Authentication Bypass Vulnerability
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-50814
1. Vulnerability Assessment and Severity Evaluation
The vulnerability described in EUVD-2025-50814 affects Milvus, an open-source vector database designed for generative AI applications. The issue allows an unauthenticated attacker to bypass all authentication mechanisms in the Milvus Proxy component, thereby gaining full administrative access to the Milvus cluster. This vulnerability is severe because it grants the attacker the ability to read, modify, or delete data, and perform privileged administrative operations such as database or collection management.
Severity Evaluation:
- CVSS Base Score: 9.3
- CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
The high CVSS score indicates a critical vulnerability due to the following factors:
- Attack Vector (AV:N): Network-based attack.
- Attack Complexity (AC:L): Low complexity required to exploit.
- Privileges Required (PR:N): No privileges required.
- User Interaction (UI:N): No user interaction required.
- Confidentiality (VC:H), Integrity (VI:H), Availability (VA:H): High impact on all three.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Network-based Attack: An attacker can exploit this vulnerability over the network without needing to be on the same local network as the Milvus cluster.
- Unauthenticated Access: The attacker does not need any prior authentication or privileges to exploit this vulnerability.
Exploitation Methods:
- Authentication Bypass: The attacker can send specially crafted requests to the Milvus Proxy component, bypassing the authentication mechanisms.
- Data Manipulation: Once authenticated, the attacker can read, modify, or delete data within the Milvus cluster.
- Administrative Operations: The attacker can perform privileged administrative operations, such as managing databases or collections.
3. Affected Systems and Software Versions
Affected Versions:
- Milvus versions prior to 2.4.24
- Milvus versions 2.5.0 to 2.5.20
- Milvus versions 2.6.0 to 2.6.4
Fixed Versions:
- Milvus 2.4.24
- Milvus 2.5.21
- Milvus 2.6.5
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Remove SourceID Header: Temporarily mitigate the issue by removing the
sourceIDheader from all incoming requests at the gateway, API gateway, or load balancer level before they reach the Milvus Proxy.
Long-term Mitigation:
- Upgrade Milvus: Upgrade to the patched versions (2.4.24, 2.5.21, or 2.6.5) as soon as possible to eliminate the vulnerability.
- Network Segmentation: Implement network segmentation to limit access to the Milvus cluster.
- Monitoring and Logging: Enhance monitoring and logging to detect any suspicious activities or unauthorized access attempts.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant risk to organizations using Milvus for generative AI applications, particularly those in sectors such as healthcare, finance, and government, where data integrity and confidentiality are critical. The potential for unauthorized access and data manipulation could lead to severe consequences, including data breaches, financial loss, and reputational damage.
6. Technical Details for Security Professionals
Vulnerability Details:
- Component Affected: Milvus Proxy
- Exploitation Mechanism: The vulnerability is triggered by sending requests with a specific
sourceIDheader, which bypasses the authentication checks. - Impact: Full administrative access to the Milvus cluster, allowing the attacker to perform any operation on the data and administrative functions.
References:
Additional Recommendations:
- Regular Audits: Conduct regular security audits and vulnerability assessments.
- Patch Management: Implement a robust patch management process to ensure timely updates and patches.
- Security Training: Provide security training for developers and administrators to recognize and mitigate such vulnerabilities.
By addressing this vulnerability promptly and implementing the recommended mitigations, organizations can significantly reduce the risk of unauthorized access and data breaches, thereby enhancing their overall cybersecurity posture.