CVE-2018-11736

published 2018-06-05

CVE-2018-11736: An issue was discovered in Pluck before 4.7.7-dev2. /data/inc/images.php allows remote attackers to upload and execute arbitrary PHP code by using the…

Priority P2 70 critical 9.8 CVSS 3.0

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

EXPLOIT

An issue was discovered in Pluck before 4.7.7-dev2. /data/inc/images.php allows remote attackers to upload and execute arbitrary PHP code by using the image/jpeg content type for a .htaccess file.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
pluck-cms	pluck	<= 4.7.7	—
pluck-cms	pluck	—	—

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

url http://pluck1/admin.php?action=images↗

path /data/inc/images.php↗

filename .htaccess↗

command AddType application/x-httpd-php .jpg↗

• → Detect multipart file upload requests to /data/inc/images.php where the filename is '.htaccess' but the declared Content-Type is 'image/jpeg' — this is the core bypass technique. ↗
• → Alert on HTTP requests to admin.php?action=images that result in a .htaccess file being written to the images directory, followed by subsequent requests to .jpg files in that directory (PHP execution via Apache handler override). ↗
• → Monitor web server logs for POST requests to admin.php?action=images uploading a file with Content-Type: image/jpeg but a filename of .htaccess. ↗
• → Detect the string 'AddType application/x-httpd-php' appearing in uploaded files within the Pluck images directory, indicating an Apache handler override for PHP execution via non-.php extensions. ↗

• · The exploit requires authentication to the Pluck admin panel before the malicious upload can be performed; unauthenticated exploitation is not possible. ↗
• · The .htaccess-based PHP execution technique only works on Apache web servers where AllowOverride is enabled for the images directory; other web servers (e.g., nginx) are not affected by this specific bypass. ↗

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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