Description
An issue in openCRX v.5.2.2 allows a remote attacker to read internal files and execute server side request forgery attack via insecure DocumentBuilderFactory.
EPSS Score:
1%
Comprehensive Technical Analysis of EUVD-2023-2792
1. Vulnerability Assessment and Severity Evaluation
The vulnerability identified in openCRX v.5.2.2 allows a remote attacker to read internal files and execute Server Side Request Forgery (SSRF) attacks via an insecure DocumentBuilderFactory. The CVSS v3.1 base score of 9.8 indicates a critical severity level. The scoring vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H breaks down as follows:
- Attack Vector (AV): Network (N) - The vulnerability can be exploited remotely over the network.
- Attack Complexity (AC): Low (L) - The attack requires minimal skill or resources.
- Privileges Required (PR): None (N) - No special privileges are needed to exploit the vulnerability.
- User Interaction (UI): None (N) - No user interaction is required.
- Scope (S): Unchanged (U) - The vulnerability does not affect other security scopes.
- Confidentiality (C): High (H) - There is a high impact on the confidentiality of the data.
- Integrity (I): High (H) - There is a high impact on the integrity of the data.
- Availability (A): High (H) - There is a high impact on the availability of the system.
2. Potential Attack Vectors and Exploitation Methods
- Remote File Reading: An attacker can exploit the vulnerability to read internal files on the server, potentially exposing sensitive information.
- Server Side Request Forgery (SSRF): The attacker can manipulate the server to make unauthorized requests to internal or external services, leading to data exfiltration, service disruption, or further exploitation.
- XML External Entity (XXE) Injection: Given the insecure
DocumentBuilderFactory, the attacker might inject malicious XML entities to read files, perform SSRF attacks, or execute other malicious actions.
3. Affected Systems and Software Versions
The vulnerability specifically affects openCRX version 5.2.2. Other versions of openCRX may also be affected if they share the same codebase or have not been patched for this issue.
4. Recommended Mitigation Strategies
- Patching: Upgrade to a patched version of openCRX that addresses this vulnerability.
- Configuration: Ensure that the
DocumentBuilderFactoryis configured securely to prevent XXE and SSRF attacks. - Input Validation: Implement strict input validation and sanitization for all XML inputs.
- Network Segmentation: Segment the network to limit the attack surface and reduce the impact of potential SSRF attacks.
- Monitoring: Implement monitoring and logging to detect and respond to suspicious activities.
5. Impact on European Cybersecurity Landscape
The high severity of this vulnerability poses a significant risk to organizations using openCRX, particularly those in critical sectors such as finance, healthcare, and government. The potential for data breaches, service disruptions, and further exploitation underscores the need for robust cybersecurity measures and timely patching.
6. Technical Details for Security Professionals
- Vulnerability Details: The vulnerability stems from an insecure configuration of
DocumentBuilderFactory, which allows for XXE and SSRF attacks. - Exploitation: An attacker can craft malicious XML inputs to read internal files or perform unauthorized requests.
- Detection: Monitor for unusual network traffic, especially outbound requests from the server to internal or external services.
- Mitigation: Ensure that
DocumentBuilderFactoryis configured to disable external entity resolution and DTDs. Example configuration:DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); dbf.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); dbf.setFeature("http://xml.org/sax/features/external-general-entities", false); dbf.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
Conclusion
EUVD-2023-2792 represents a critical vulnerability in openCRX v.5.2.2 that requires immediate attention. Organizations should prioritize patching and implementing the recommended mitigation strategies to protect against potential exploitation. The European cybersecurity landscape must remain vigilant against such vulnerabilities to ensure the integrity and security of critical systems.