EUVD-2025-19719

Comprehensive Technical Analysis of EUVD-2025-19719

1. Vulnerability Assessment and Severity Evaluation

The vulnerability described in EUVD-2025-19719 is an unauthenticated remote command execution flaw in the Hikvision Integrated Security Management Platform (HikCentral). This vulnerability arises from the use of a vulnerable version of the Fastjson library within the applyCT component. The severity of this vulnerability is rated with a CVSS base score of 10.0, indicating a critical risk. The CVSS vector CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H highlights that the vulnerability can be exploited over the network without any authentication or user interaction, leading to high confidentiality, integrity, and availability impacts.

2. Potential Attack Vectors and Exploitation Methods

The primary attack vector involves sending specially crafted JSON payloads to the /bic/ssoService/v1/applyCT endpoint. The Fastjson library's auto-type feature, which is enabled by default, allows for the deserialization of untrusted user input. An attacker can exploit this by referencing a malicious Java class via an LDAP URL, leading to remote code execution (RCE).

Exploitation Steps:

1. Identify the Vulnerable Endpoint: The attacker identifies the /bic/ssoService/v1/applyCT endpoint as the target.
2. Craft Malicious Payload: The attacker crafts a JSON payload that includes a reference to a malicious Java class via an LDAP URL.
3. Send Payload: The attacker sends the payload to the vulnerable endpoint.
4. Achieve RCE: The Fastjson library deserializes the payload, triggering the auto-type feature and loading the malicious class, resulting in remote code execution.

3. Affected Systems and Software Versions

The vulnerability affects the Hikvision Integrated Security Management Platform, specifically the HikCentral product. The exact version affected is not specified in the entry, but it is implied that all versions using the vulnerable Fastjson library are at risk. Organizations using HikCentral should assume they are vulnerable until they can confirm the version of the Fastjson library in use.

4. Recommended Mitigation Strategies

Immediate Mitigation:

1. Disable Auto-Type Feature: Immediately disable the auto-type feature in the Fastjson library to prevent deserialization of untrusted input.
2. Network Segmentation: Isolate the HikCentral platform from public networks to limit exposure.
3. Firewall Rules: Implement strict firewall rules to restrict access to the /bic/ssoService/v1/applyCT endpoint.

Long-Term Mitigation:

1. Update Fastjson Library: Upgrade to a patched version of the Fastjson library that addresses the vulnerability.
2. Patch Management: Implement a robust patch management program to ensure all software components are regularly updated.
3. Input Validation: Enhance input validation mechanisms to sanitize and validate all user inputs.
4. Security Audits: Conduct regular security audits and vulnerability assessments to identify and mitigate similar issues.

5. Impact on European Cybersecurity Landscape

The vulnerability poses a significant risk to European organizations using Hikvision's HikCentral platform, particularly those in critical infrastructure sectors such as government, healthcare, and finance. Successful exploitation could lead to data breaches, service disruptions, and potential loss of sensitive information. The high severity of this vulnerability underscores the need for vigilant cybersecurity practices and timely patch management across the EU.

6. Technical Details for Security Professionals

Vulnerability Details:

• Endpoint: /bic/ssoService/v1/applyCT
• Library: Fastjson
• Feature: Auto-type
• Exploitation Method: Deserialization of untrusted input leading to RCE

Detection and Monitoring:

1. Log Analysis: Monitor logs for unusual activity related to the /bic/ssoService/v1/applyCT endpoint.
2. Intrusion Detection Systems (IDS): Deploy IDS to detect and alert on suspicious network traffic targeting the vulnerable endpoint.
3. Behavioral Analysis: Implement behavioral analysis tools to identify anomalous behavior indicative of RCE attempts.

Response and Recovery:

1. Incident Response Plan: Develop and implement an incident response plan tailored to this vulnerability.
2. Forensic Analysis: Conduct forensic analysis to determine the extent of the compromise and identify any malicious activities.
3. Recovery Procedures: Follow established recovery procedures to restore affected systems and ensure business continuity.

References:

• GitHub PeiQi-WIKI-Book
• S4E Tools
• VulnCheck Advisories

By addressing this vulnerability promptly and comprehensively, organizations can significantly reduce the risk of exploitation and protect their critical assets.