CVE-2019-9623

published 2019-03-07

CVE-2019-9623: Feng Office 3.7.0.5 allows remote attackers to execute arbitrary code via "<!--#exec cmd=" in a .shtml file to ck_upload_handler.php.

Priority P2 68 critical 9.8 CVSS 3.0

AV N AC L PR N UI N S U C H I H A H

EXPLOIT

Feng Office 3.7.0.5 allows remote attackers to execute arbitrary code via "<!--#exec cmd=" in a .shtml file to ck_upload_handler.php.

Affected

1 ranges

Vendor	Product	Version range	Fixed in
fengoffice	feng_office	—	—

Detection & IOCs extracted from sources · hover to see the quote

path /ck_upload_handler.php↗

path /tmp/↗

command <!--#exec cmd=↗

filename .shtml↗

• → Monitor for unauthenticated POST requests to /ck_upload_handler.php, especially multipart/form-data uploads containing .shtml files with SSI exec directives. ↗
• → Detect SSI exec injection payload '<!--#exec cmd=' within uploaded file content, particularly in .shtml files uploaded to the /tmp/ directory. ↗
• → Alert on GET requests to /tmp/<random_filename>.shtml followed shortly by a GET request to /<random_filename>.php, indicating the two-stage payload migration and execution pattern used by this exploit. ↗
• → The .htaccess in /tmp blocks php/php2/php3 extensions; watch for .shtml uploads to /tmp/ as a bypass mechanism to relocate PHP payloads to the web root. ↗

• · The exploit targets Feng Office version 3.7.0.5 specifically; other versions may not be vulnerable or may behave differently. ↗
• · The exploit is unauthenticated — no session or credentials are required, meaning perimeter authentication controls alone are insufficient to block exploitation. ↗

CVSS provenance

nvd v3.0 9.8 CRITICAL CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd v2.0 7.5 HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P

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