CVE-2021-32827
Arbitrary code execution in MockServer
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.
- Affected
- mock-server · mockserver
- CVSS v3.1 NVD
- 9.6 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H - CVSS v3.1 GITHUB
- 6.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N - CVSS v2.0 NVD
- 6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P - EPSS
- 2.16% chance of exploitation in the next 30 days, 82nd percentile
- Published
- 2021-08-16
- Updated
- 2024-08-03
Proof-of-concept exploits (1)
Security advisories
- https://securitylab.github.com/advisories/GHSL-2021-059-mockserver
- https://www.oracle.com/security-alerts/cpujan2022.html
- advisories/GHSA-v3cg-h3f6-2242