CVE-2021-32827 Arbitrary code execution in MockServer
An attacker can execute arbitrary code on a developer's machine by tricking them into visiting a malicious site while running MockServer with default settings.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2021-32827?
CVE-2021-32827 is a medium-severity code injection vulnerability in Oracle Communications Cloud Native Core Policy, published on 16 Aug 2021. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Which versions are affected by CVE-2021-32827?
2 open source packages ship an affected version, including org.mock-server:mockserver. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
org.mock-server:mockserver Maven | All versions to 5.11.2 | None |
org.mock-server:mockserver Maven | All versions to 5.11.2 | None |
Products include Mock-Server Mockserver, Oracle Communications Cloud Native Core Policy.
How do I fix CVE-2021-32827?
No fix has been published for CVE-2021-32827 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2021-32827 being exploited?
There is no known exploitation of CVE-2021-32827 in the wild and no public exploit code.
Sources
Also known as GHSA-v3cg-h3f6-2242.