PT-2021-5219 · Unknown · Laravel Framework

Published 2021-11-14 · Updated 2021-11-20 · CVE-2021-43617

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Laravel Framework versions through 8.70.2

Description The issue is related to the insufficient blocking of executable PHP content uploads. Specifically, Illuminate/Validation/Concerns/ValidatesAttributes.php lacks a check for .phar files, which are handled as application/x-httpd-php on systems based on Debian. This may be related to file-type validation for image upload, including differences between getClientOriginalExtension and other approaches. The vulnerability could allow a remote attacker to execute arbitrary code.

Recommendations For Laravel Framework versions through 8.70.2, consider disabling the file upload functionality until a proper fix is applied, focusing on enhancing the validation for .phar files and ensuring proper handling of application/x-httpd-php files. Additionally, review and enhance file-type validation for image uploads to prevent potential exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Unrestricted File Upload

Weakness Enumeration

CWE-434

Related Identifiers

BDU:2021-06021

CVE-2021-43617

GHSA-364W-9G92-3GRQ

Affected Products

Laravel Framework

References · 17

• 🔥 https://github.com/kombat1/CVE-2021-43617 · Exploit
• 🔥 https://exploit-db.com/exploits/50525 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-43617 · Vendor Advisory
• https://salsa.debian.org/php-team/php/-/blob/dc253886b5b2e9bc8d9e36db787abb083a667fd8/debian/php-cgi.conf#L5-6 · Patch
• https://security-tracker.debian.org/tracker/CVE-2021-43617 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-364w-9g92-3grq · Vendor Advisory
• https://salsa.debian.org/php-team/php/-/commit/dc253886b5b2e9bc8d9e36db787abb083a667fd8 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-43617 · Security Note
• https://osv.dev/vulnerability/CVE-2021-43617 · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06021 · Security Note
• https://github.com/laravel/framework/blob/2049de73aa099a113a287587df4cc522c90961f5/src/Illuminate/Validation/Concerns/ValidatesAttributes.php#L1331-L1333 · Note
• https://github.com/laravel/framework · Note
• https://github.com/laravel/framework/blob/2049de73aa099a113a287587df4cc522c90961f5/src/Illuminate/Validation/Concerns/ValidatesAttributes.php#L1130-L1132 · Note
• https://t.me/cybersecuritytechnologies/4790 · Telegram Post
• https://t.me/cvenotify/23389 · Telegram Post