CVE-2020-1959 : Exploit Details and Defense Strategies
Learn about CVE-2020-1959 affecting Apache Syncope. Understand the impact, exploitation mechanism, and mitigation steps for this Remote Code Execution vulnerability.
Apache Syncope prior to 2.1.6 is affected by a Server-Side Template Injection vulnerability, allowing attackers to execute Remote Code.
Understanding CVE-2020-1959
What is CVE-2020-1959?
A Server-Side Template Injection in Apache Syncope prior to 2.1.6 allows injection of Java EL expressions, leading to unauthenticated Remote Code Execution (RCE).
The Impact of CVE-2020-1959
- Attackers can inject arbitrary Java code via custom constraint violation error messages.
- Vulnerability enables unauthenticated RCE, posing a severe security risk.
Technical Details of CVE-2020-1959
Vulnerability Description
The issue arises from Apache Syncope using Java Bean Validation custom constraint validators, permitting Java EL expression interpolation.
Affected Systems and Versions
- Product: Apache Syncope
- Versions: Apache Syncope 2.1.X releases before 2.1.6
Exploitation Mechanism
- Attackers inject malicious Java EL expressions leading to unauthenticated RCE.
Mitigation and Prevention
Immediate Steps to Take
- Update Apache Syncope to version 2.1.6 or later.
- Implement input validation to sanitize user-controlled data.
Long-Term Security Practices
- Regularly monitor security advisories for Apache Syncope.
- Perform security assessments and penetration testing.
Patching and Updates
- Apply vendor-provided patches promptly to address vulnerabilities.