CVE-2021-32827: Arbitrary code execution in MockServer
First published: Mon Aug 16 2021(Updated: )
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.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mock-server Mockserver | ||
| Oracle Communications Cloud Native Core Policy | =1.14.0 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-32827?
CVE-2021-32827 is a vulnerability in MockServer software that allows an attacker to execute arbitrary code on the MockServer machine by tricking a victim into visiting a malicious site.
What is the severity of CVE-2021-32827?
CVE-2021-32827 has a severity rating of 9.6 (critical).
What software is affected by CVE-2021-32827?
MockServer and Oracle Communications Cloud Native Core Policy versions up to 1.14.0 are affected by CVE-2021-32827.
How can an attacker exploit CVE-2021-32827?
An attacker can exploit CVE-2021-32827 by tricking a victim into visiting a malicious site while running MockServer locally, allowing them to run arbitrary code on the MockServer machine.
Are there any references for CVE-2021-32827?
Yes, you can find more information about CVE-2021-32827 at the following references: [https://securitylab.github.com/advisories/GHSL-2021-059-mockserver/](https://securitylab.github.com/advisories/GHSL-2021-059-mockserver/) and [https://www.oracle.com/security-alerts/cpujan2022.html](https://www.oracle.com/security-alerts/cpujan2022.html).
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