WAF bypass of the ModSecurity v3 release line
Vulnerability Description
ModSecurity / libModSecurity 3.0.0 to 3.0.11 is affected by a WAF bypass for path-based payloads submitted via specially crafted request URLs. ModSecurity v3 decodes percent-encoded characters present in request URLs before it separates the URL path component from the optional query string component. This results in an impedance mismatch versus RFC compliant back-end applications. The vulnerability hides an attack payload in the path component of the URL from WAF rules inspecting it. A back-end may be vulnerable if it uses the path component of request URLs to construct queries. Integrators and users are advised to upgrade to 3.0.12. The ModSecurity v2 release line is not affected by this vulnerability.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Andrea Menin @AndreaTheMiddle <https://github.com/theMiddleBlue>
- Matteo Pace @M4tteoP <https://github.com/M4tteoP>
- Max Leske <https://github.com/theseion>
- Ervin Hegedüs @airween <https://github.com/airween>
References
- https://owasp.org/www-project-modsecurity/tab_cves#cve-2024-1019-2024-01-30
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/34KDQNZE2RS3CWFG5654LNHKXXDPIW5I/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K6ZGABPJK2JPVH2JDFHZ5LQLWGONUH7V/
Affected Vendor
OWASP ModSecurity
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