This issue has been addressed in commit `d3b742d61a` which has been included in version 1.4.3. The attacker must be able to upload a file and the server must be running a PHP version prior to 8. A successful exploitation of this vulnerability allows executing arbitrary code and accessing the underlying filesystem. However, PHP wrappers being case insensitive, this patch can be bypassed using `PHAR://` instead of `phar://`. To fix this issue, the string is now passed to the `strpos()` function and if it starts with `phar://`, an exception is raised. This allowed users to trigger a deserialization on arbitrary PHAR files.
In the original vulnerability, a file name with a `phar://` wrapper could be sent to the `fileExists()` function, equivalent to the `file_exists()` PHP function. Version 1.4.2 added a check `if (\strpos($filename, 'phar://') = 0)` in the `prepareOutput` function to resolve this CVE, however if the user is able to control the second parameter of the `generateFromHtml()` function of Snappy, it will then be passed as the `$filename` parameter in the `prepareOutput()` function. # Issue On March 17th the vulnerability CVE-2023-28115 was disclosed, allowing an attacker to gain remote code execution through PHAR deserialization. Knplabs/knp-snappy is a PHP library allowing thumbnail, snapshot or PDF generation from a url or a html page.
This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page, and makes it possible to update the user metas arbitrarily, but the meta value can only be a string. due to insufficient input sanitization and output escaping. The FV Flowplayer Video Player plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the ‘_fv_player_user_video’ parameter saved via the 'save' function hooked via init, and the plugin is also vulnerable to Arbitrary Usermeta Update via the 'save' function in versions up to, and including, 7. The associated identifier of this vulnerability is VDB-238635. The exploit has been disclosed to the public and may be used. It is possible to initiate the attack remotely. This affects the function Validity_check. A vulnerability classified as critical has been found in TOTOLINK N200RE V5 9.3.5u.6437_B20230519.
0 kommentar(er)
