Description
SOFARPC is a Java RPC framework. SOFARPC defaults to using the SOFA Hessian protocol to deserialize received data, while the SOFA Hessian protocol uses a blacklist mechanism to restrict deserialization of potentially dangerous classes for security protection. But, prior to version 5.12.0, there is a gadget chain that can bypass the SOFA Hessian blacklist protection mechanism, and this gadget chain only relies on JDK and does not rely on any third-party components. Version 5.12.0 fixed this issue by adding a blacklist. SOFARPC also provides a way to add additional blacklists. Users can add a class like `-Drpc_serialize_blacklist_override=org.apache.xpath.` to avoid this issue.
EPSS Score:
2%
Comprehensive Technical Analysis of EUVD-2024-0286
1. Vulnerability Assessment and Severity Evaluation
Vulnerability Description: The vulnerability in SOFARPC, a Java RPC framework, arises from a gadget chain that can bypass the SOFA Hessian blacklist protection mechanism. This gadget chain relies solely on the JDK and does not require any third-party components. The issue was fixed in version 5.12.0 by adding a blacklist.
Severity Evaluation:
The vulnerability has a CVSS Base Score of 9.8, which is classified as critical. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H indicates the following:
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): High (H)
- Integrity (I): High (H)
- Availability (A): High (H)
This high severity score underscores the critical nature of the vulnerability, which can lead to significant impacts on confidentiality, integrity, and availability.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Remote Code Execution (RCE): An attacker can exploit the vulnerability to execute arbitrary code on the target system.
- Deserialization Attacks: The gadget chain can be used to deserialize malicious payloads, leading to code execution or other malicious activities.
Exploitation Methods:
- Crafted Payloads: An attacker can craft a specially designed payload that exploits the gadget chain to bypass the blacklist mechanism.
- Network Attacks: Since the attack vector is network-based, an attacker can exploit the vulnerability over the network without requiring physical access or user interaction.
3. Affected Systems and Software Versions
Affected Systems:
- Systems running SOFARPC versions prior to 5.12.0.
- Any application or service that relies on SOFARPC for RPC communication.
Affected Software Versions:
- SOFARPC versions < 5.12.0
4. Recommended Mitigation Strategies
Immediate Mitigation:
- Upgrade: Upgrade to SOFARPC version 5.12.0 or later, which includes the fix for this vulnerability.
- Blacklist Configuration: Add additional blacklists to restrict deserialization of potentially dangerous classes. For example, users can add a class like
-Drpc_serialize_blacklist_override=org.apache.xpath..
Long-term Mitigation:
- Regular Patching: Ensure that all software components are regularly updated and patched.
- Network Security: Implement robust network security measures, including firewalls and intrusion detection systems.
- Code Review: Conduct thorough code reviews and security audits to identify and mitigate similar vulnerabilities.
5. Impact on European Cybersecurity Landscape
Impact Assessment:
- Widespread Use: SOFARPC is widely used in various applications and services, making the vulnerability a significant risk to many organizations.
- Critical Infrastructure: The vulnerability could impact critical infrastructure, especially if SOFARPC is used in systems that manage sensitive data or operations.
- Compliance: Organizations must ensure compliance with relevant regulations and standards, such as GDPR, to protect user data and maintain trust.
Regulatory and Compliance Considerations:
- GDPR Compliance: Organizations must ensure that they comply with GDPR requirements for data protection and breach notification.
- Incident Response: Develop and implement incident response plans to quickly detect and respond to any exploitation attempts.
6. Technical Details for Security Professionals
Technical Overview:
- Deserialization Mechanism: SOFARPC uses the SOFA Hessian protocol for deserialization, which includes a blacklist mechanism to restrict dangerous classes.
- Gadget Chain: The vulnerability involves a gadget chain that can bypass the blacklist mechanism, allowing for the deserialization of malicious payloads.
- JDK Dependency: The gadget chain relies solely on the JDK, making it a significant risk as it does not require any third-party components.
Mitigation Steps:
- Upgrade SOFARPC: Ensure that all instances of SOFARPC are upgraded to version 5.12.0 or later.
- Configure Blacklist: Add additional blacklists to the SOFARPC configuration to further restrict deserialization.
- Monitor and Log: Implement monitoring and logging to detect any suspicious activities related to deserialization.
- Security Audits: Conduct regular security audits and code reviews to identify and mitigate similar vulnerabilities.
References:
By following these recommendations and staying vigilant, organizations can mitigate the risks associated with this vulnerability and enhance their overall cybersecurity posture.