CVE-2021-32827 Security Details

CVE ID

CVE-2021-32827

CWE

CWE-74

CWE-79

CVE Description

MockServer is open source software which enables easy mocking of any system you integrate with via HTTP or HTTPS. An attacker that can trick a victim into visiting a malicious site while running MockServer locally, will be able to run arbitrary code on the MockServer machine. With an overly broad default CORS configuration MockServer allows any site to send cross-site requests. Additionally, MockServer allows you to create dynamic expectations using Javascript or Velocity templates. Both engines may allow an attacker to execute arbitrary code on-behalf of MockServer. By combining these two issues (Overly broad CORS configuration + Script injection), an attacker could serve a malicious page so that if a developer running MockServer visits it, they will get compromised. For more details including a PoC see the referenced GHSL-2021-059.

Published

Jul 22, 2021

CVSS Score & Severity

9.6Critical

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS Score

0.757%

Malware

malware

KEV Status

Not in KEV Catalog: No known exploits

Vulnerable Methods

org/mockserver/cors/CORSHeaders.addCORSHeaders(Lorg/mockserver/model/HttpRequest;Lorg/mockserver/model/HttpResponse;)V

JVM

org/mockserver/mockserver/MockServerHandler.addCORSHeaders(Lorg/mockserver/model/HttpResponse;)V

JVM

org/mockserver/server/MockServerServlet.addCORSHeaders(Ljavax/servlet/http/HttpServletResponse;)V

JVM

Affected Ecosystems

affected

Source

National Vulnerability Database

References

GitHub · Issue #1062PROJECT

github.comTHIRD_PARTY