CVE-2022-46604

published 2023-02-02

CVE-2022-46604: An issue in Tecrail Responsive FileManager v9.9.5 and below allows attackers to bypass the file extension check mechanism and upload a crafted PHP file…

Priority P1 78 high 8.8 CVSS 3.1

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

ITW EXPLOIT VulnCheck KEV Initial access

An issue in Tecrail Responsive FileManager v9.9.5 and below allows attackers to bypass the file extension check mechanism and upload a crafted PHP file, leading to arbitrary code execution.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
apache	activemq	>= 0 < 5.16.1-1ubuntu0.1	5.16.1-1ubuntu0.1
tecrail	responsive_filemanager	<= 9.9.5	—

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

url http://{host}/filemanager/execute.php?action=create_file↗

url http://{host}/filemanager/dialog.php↗

url http://{host}/source/shell.php↗

path /source/shell.php↗

filename shell.php↗

filename shell.txt↗

path ../thumbs/shell.php↗

cookie PHPSESSID↗

command ?cmd={command_to_run}↗

other File successfully saved.↗

• → Detect POST requests to /filemanager/execute.php with the query parameter action=create_file, which is the exploit's file creation endpoint used to plant a PHP webshell disguised as a .txt file. ↗
• → Alert on POST body parameters containing path=shell.php combined with name=shell.txt — this is the extension bypass technique: the file is named .txt but written to a .php path. ↗
• → Monitor for path_thumb values containing directory traversal sequences (e.g., ../thumbs/) in POST requests to the filemanager endpoint. ↗
• → Detect GET requests to /source/shell.php with a ?cmd= query parameter, indicating webshell interaction post-exploitation. ↗
• → Flag creation of any .php file under the /source/ or /thumbs/ directories of the Responsive FileManager installation, as these are not expected upload destinations for PHP files. ↗
• → The server response string 'File successfully saved.' on a create_file action targeting a .php path is a strong indicator of successful webshell implantation. ↗

• · The exploit targets Responsive FileManager version 9.9.5 and below. Installations running versions above 9.9.5 are not affected by this specific bypass. ↗
• · The webshell filename (shell.php) and path (/source/shell.php) used in the public PoC are defaults and may be trivially changed by an attacker; detection should not rely solely on this specific filename. ↗

CVSS provenance

nvd v3.1 8.8 HIGH CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

osv 8.8 HIGH

vulncheck 8.8 HIGH

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