CVE-2020-14209

published 2020-09-02

CVE-2020-14209: Dolibarr before 11.0.5 allows low-privilege users to upload files of dangerous types, leading to arbitrary code execution. This occurs because .pht and .phar…

Priority P2 73 high 8.8 CVSS 3.1

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

EXPLOIT

Dolibarr before 11.0.5 allows low-privilege users to upload files of dangerous types, leading to arbitrary code execution. This occurs because .pht and .phar files can be uploaded. Also, a .htaccess file can be uploaded to reconfigure access control (e.g., to let .noexe files be executed as PHP code to defeat the .noexe protection mechanism).

Affected

2 ranges

Vendor	Product	Version range	Fixed in
dolibarr	dolibarr	< 11.0.5	11.0.5
dolibarr	dolibarr	>= 0 < 11.0.5	11.0.5

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

path user/document.php↗

path documents/users/{id}/↗

filename .htaccess↗

filename .pht↗

filename .phar↗

filename .noexe↗

command AddType application/x-httpd-php .noexe AddHandler application/x-httpd-php .noexe Order deny,allow Allow from all↗

url http://127.0.0.1/htdocs/index.php↗

url http://127.0.0.1/htdocs/user/document.php↗

• → Monitor POST requests to user/document.php containing multipart file uploads with dangerous extensions: .pht, .phar, .phpt, .phtml, .php3, .php4, .php5, .php6, .php7, .shtml ↗
• → Alert on POST to user/document.php with action=renamefile where renamefileto ends in .php or other executable extension — indicates file-renaming bypass technique ↗
• → Detect upload of a .htaccess file to the Dolibarr documents/users/ directory, especially containing 'AddType application/x-httpd-php' or 'AddHandler application/x-httpd-php' directives targeting .noexe files ↗
• → Detect GET requests to documents/users/{id}/*.pht, *.phar, *.noexe, *.shtml with a query parameter 'cmd=' — indicates RCE payload execution attempt ↗
• → Monitor POST to user/document.php with action=confirm_deletefile targeting '.htaccess', immediately followed by a rename of an uploaded file to '.htaccess' — classic htaccess swap attack pattern ↗
• → Detect SSI-based exploitation: upload of .shtml files to user document area with Accept header containing OS commands ↗

• · The exploit targets Dolibarr versions prior to 11.0.5; the vulnerability is fixed in 11.0.5 and later. The exploit requires authenticated access (low-privilege user credentials). ↗
• · The .noexe protection mechanism in Dolibarr is bypassable via .htaccess upload; detection rules should not rely solely on .noexe extension blocking as a security control. ↗
• · Three distinct exploitation methods exist (extension-bypass, file-renaming, htaccess); detection coverage must address all three independently. ↗

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

nvd v2.0 6.5 MEDIUM AV:N/AC:L/Au:S/C:P/I:P/A:P

osv 8.8 HIGH

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