Checkmarx AI Remediation - CVE-2020-1757#11
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Checkmarx One – Remediation
CVE-2020-1757 ·
High
Triage context:
Reachable · 
Exploitable
Fix CVE-2020-1757 path normalization vulnerability in undertow-core
What is the issue?
CVE-2020-1757 is a HIGH severity vulnerability in undertow-core versions prior to 2.0.30.SP1 and 2.1.0.Final that incorrectly normalizes servlet paths by truncating after semicolons. This path normalization flaw allows attackers to bypass security constraints and access unauthorized resources through malformed URL paths containing semicolons, exploiting improper input validation (CWE-20).
Why should it be fixed?
This vulnerability poses a significant security risk with a network attack vector and low attack complexity, making it easily exploitable remotely. Successful exploitation could lead to unauthorized access to sensitive data and protected application endpoints. The application actively uses undertow's AJP protocol classes, directly exposing it to path manipulation attacks.
How should it be fixed?
Upgrading undertow-core from version 2.0.9.Final to 2.2.39.Final in pom.xml. This version includes security patches that fix the path normalization logic to properly handle semicolons in servlet paths. Running mvn dependency:resolve to ensure Maven's dependency resolution is updated and the new version is properly locked. No application code changes are required as the upgrade maintains backward compatibility with existing undertow class usage.
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