CVE-2023-28115 Information

Description

Snappy is a PHP library allowing thumbnail snapshot or PDF generation from a url or a html page. Prior to version 1.4.2 Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_exists() function. If an attacker can upload files of any type to the server he can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution especially when snappy is used with frameworks with documented POP chains like Laravel/Symfony vulnerable developer code. If a user can control the output file from the generateFromHtml() function it will invoke deserialization. This vulnerability is capable of remote code execution if Snappy is used with frameworks or developer code with vulnerable POP chains. It has been fixed in version 1.4.2.

Reference

https://github.com/KnpLabs/snappy/releases/tag/v1.4.2 https://github.com/KnpLabs/snappy/security/advisories/GHSA-gq6w-q6wh-jggc https://github.com/KnpLabs/snappy/commit/b66f79334421c26d9c244427963fa2d92980b5d3 https://github.com/KnpLabs/snappy/commit/1ee6360cbdbea5d09705909a150df7963a88efd6 https://github.com/KnpLabs/snappy/blob/5126fb5b335ec929a226314d40cd8dad497c3d67/src/Knp/Snappy/AbstractGenerator.php#L670 https://github.com/KnpLabs/snappy/pull/469 Snappy is a PHP library allowing thumbnail snapshot or PDF generation from a url or a html page. Prior to version 1.4.2 Snappy is vulnerable to PHAR deserialization due to a lack of checking on the protocol before passing it into the file_exists() function. If an attacker can upload files of any type to the server he can pass in the phar:// protocol to unserialize the uploaded file and instantiate arbitrary PHP objects. This can lead to remote code execution especially when snappy is used with frameworks with documented POP chains like Laravel/Symfony vulnerable developer code. If a user can control the output file from the generateFromHtml() function it will invoke deserialization. This vulnerability is capable of remote code execution if Snappy is used with frameworks or developer code with vulnerable POP chains. It has been fixed in version 1.4.2.