A vulnerability was found in Kaltura mwEmbed up to 2.96.rc1 and classified as problematic. This issue affects an unknown function of the file includes/DefaultSettings.php. The manipulation of the argument HTTP_X_FORWARDED_HOST with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity.

The weakness was disclosed 01/04/2023 as 4266. It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2022-4876. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

By approaching the search of inurl:includes/DefaultSettings.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 2.96.rc2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 13b8812ebc8c9fa034eed91ab35ba8423a528c0b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. The advisory contains the following remark:

ignore non valid hostname in HTTP_X_FORWARDED_HOST header (same regex as [the server](https://github.com/kaltura/server/blob/Rigel-18.6.0/infra/storage/file_transfer_managers/asperaMgr.class.php#L81))

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Vendor

• Kaltura

Name

• mwEmbed

Version

• 2.96.rc1

License

• open-source

CPE 2.3info

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• 🔍

CPE 2.2info

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