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Apache Tomcat Remote Command Execution

ID: CVE-2020-9484

Severity: high

Author: dwisiswant0

Tags: cve2020,cve,rce,packetstorm,apache,tomcat

Description

Section titled “Description”

When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 ifa) an attacker is able to control the contents and name of a file on the server; andb) the server is configured to use the PersistenceManager with a FileStore; andc) the PersistenceManager is configured with sessionAttributeValueClassNameFilter=“null” (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; andd) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control.Note that all of conditions a) to d) must be true for the attack to succeed.

YAML Source

Section titled “YAML Source”
id: CVE-2020-9484


info:
  name: Apache Tomcat Remote Command Execution
  author: dwisiswant0
  severity: high
  description: |
    When using Apache Tomcat versions 10.0.0-M1 to 10.0.0-M4, 9.0.0.M1 to 9.0.34, 8.5.0 to 8.5.54 and 7.0.0 to 7.0.103 if
    a) an attacker is able to control the contents and name of a file on the server; and
    b) the server is configured to use the PersistenceManager with a FileStore; and
    c) the PersistenceManager is configured with sessionAttributeValueClassNameFilter="null" (the default unless a SecurityManager is used) or a sufficiently lax filter to allow the attacker provided object to be deserialized; and
    d) the attacker knows the relative file path from the storage location used by FileStore to the file the attacker has control over; then, using a specifically crafted request, the attacker will be able to trigger remote code execution via deserialization of the file under their control.
    Note that all of conditions a) to d) must be true for the attack to succeed.
  impact: |
    Successful exploitation of this vulnerability can lead to remote code execution, allowing attackers to execute arbitrary commands on the affected system.
  remediation: |
    Apply the latest security patches provided by Apache to mitigate this vulnerability.
  reference:
    - http://packetstormsecurity.com/files/157924/Apache-Tomcat-CVE-2020-9484-Proof-Of-Concept.html
    - https://nvd.nist.gov/vuln/detail/CVE-2020-9484
    - https://lists.apache.org/thread.html/r77eae567ed829da9012cadb29af17f2df8fa23bf66faf88229857bb1%40%3Cannounce.tomcat.apache.org%3E
    - https://lists.apache.org/thread.html/rf70f53af27e04869bdac18b1fc14a3ee529e59eb12292c8791a77926@%3Cusers.tomcat.apache.org%3E
    - http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00057.html
  classification:
    cvss-metrics: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 7
    cve-id: CVE-2020-9484
    cwe-id: CWE-502
    epss-score: 0.92247
    epss-percentile: 0.98942
    cpe: cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: apache
    product: tomcat
    shodan-query:
      - title:"Apache Tomcat"
      - http.title:"apache tomcat"
      - http.html:"apache tomcat"
      - cpe:"cpe:2.3:a:apache:tomcat"
    fofa-query:
      - body="apache tomcat"
      - title="apache tomcat"
    google-query: intitle:"apache tomcat"
  tags: cve2020,cve,rce,packetstorm,apache,tomcat


http:
  - method: GET
    path:
      - "{{BaseURL}}/index.jsp"


    headers:
      Cookie: "JSESSIONID=../../../../../usr/local/tomcat/groovy"


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "Exception"
          - "ObjectInputStream"
          - "PersistentManagerBase"
        condition: and


      - type: status
        status:
          - 500
# digest: 490a0046304402206db44f3fcecee52f194100b66410c07b4ccb58e1ab2360933c667fb6edfb3ccc022075bf1a6e52cc4c471987710c13e179b199a972e37d022c3c1a5776aa7eb3498e:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2020/CVE-2020-9484.yaml"

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