Description
xml-crypto is an XML digital signature and encryption library for Node.js. An attacker may be able to exploit a vulnerability in versions prior to 6.0.1, 3.2.1, and 2.1.6 to bypass authentication or authorization mechanisms in systems that rely on xml-crypto for verifying signed XML documents. The vulnerability allows an attacker to modify a valid signed XML message in a way that still passes signature verification checks. For example, it could be used to alter critical identity or access control attributes, enabling an attacker with a valid account to escalate privileges or impersonate another user. Users of versions 6.0.0 and prior should upgrade to version 6.0.1 to receive a fix. Those who are still using v2.x or v3.x should upgrade to patched versions 2.1.6 or 3.2.1, respectively.
EPSS Score:
0%
Comprehensive Technical Analysis of EUVD-2025-7890
1. Vulnerability Assessment and Severity Evaluation
The vulnerability in the xml-crypto library, identified as EUVD-2025-7890 (CVE-2025-29774), is critical. The CVSS (Common Vulnerability Scoring System) base score of 9.3 indicates a high severity level. The vulnerability allows an attacker to bypass authentication or authorization mechanisms by modifying a valid signed XML message in a way that still passes signature verification checks. This can lead to privilege escalation or user impersonation, posing significant risks to systems relying on xml-crypto for verifying signed XML documents.
2. Potential Attack Vectors and Exploitation Methods
- Authentication Bypass: An attacker could modify critical identity attributes in a signed XML message, allowing them to bypass authentication mechanisms.
- Authorization Bypass: By altering access control attributes, an attacker could gain unauthorized access to restricted resources.
- Privilege Escalation: An attacker with a valid account could escalate their privileges by modifying the XML message to include higher-level access rights.
- User Impersonation: An attacker could impersonate another user by modifying the XML message to include the target user's identity attributes.
3. Affected Systems and Software Versions
The vulnerability affects the following versions of the xml-crypto library:
- Versions prior to 2.1.6
- Versions 3.0.0 to 3.2.0
- Versions 4.0.0 to 6.0.0
Systems and applications that rely on these versions of xml-crypto for XML digital signature and encryption are at risk.
4. Recommended Mitigation Strategies
- Upgrade to Patched Versions: Users should upgrade to the patched versions of
xml-crypto:- Version 2.1.6 for users of v2.x
- Version 3.2.1 for users of v3.x
- Version 6.0.1 for users of v6.x
- Implement Additional Verification: Add additional layers of verification for critical identity and access control attributes beyond XML signature verification.
- Monitor and Audit: Regularly monitor and audit XML messages for any signs of tampering or unauthorized modifications.
- Security Awareness: Educate developers and administrators about the risks associated with this vulnerability and the importance of timely updates.
5. Impact on European Cybersecurity Landscape
The vulnerability poses a significant threat to the European cybersecurity landscape, particularly for organizations that rely on XML digital signatures for secure communications and transactions. The potential for authentication and authorization bypass, privilege escalation, and user impersonation could lead to data breaches, unauthorized access, and other security incidents. This underscores the importance of timely patching and robust security practices.
6. Technical Details for Security Professionals
- Vulnerability Type: The vulnerability is related to the improper verification of XML signatures, allowing an attacker to modify signed XML messages without invalidating the signature.
- Exploitation: An attacker can craft a modified XML message that retains the original signature's validity, thereby bypassing security checks.
- Detection: Implementing integrity checks and monitoring for unusual modifications in XML messages can help detect potential exploitation attempts.
- Patch Analysis: The patches in versions 2.1.6, 3.2.1, and 6.0.1 address the vulnerability by enhancing the signature verification process to detect and reject modified messages.
References
- GitHub Security Advisory
- Patch Commit 1
- Patch Commit 2
- Patch Commit 3
- Release v2.1.6
- Release v3.2.1
- Release v6.0.1
Conclusion
The vulnerability in xml-crypto is a critical concern for organizations using this library for XML digital signatures. Immediate action is required to upgrade to the patched versions and implement additional security measures to mitigate the risks associated with this vulnerability. The European cybersecurity community should remain vigilant and proactive in addressing such threats to ensure the integrity and security of digital communications.