CVE-2020-26255
Kirby Panel users could upload PHP Phar archives as content files before v2.5.14 and v3.4.5
Description
### Impact An editor with full access to the Kirby Panel can upload a PHP `.phar` file and execute it on the server. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can gain access to the server with such a Phar file. Visitors without Panel access *cannot* use this attack vector. ### Patches The problem has been patched in [Kirby 2.5.14](https://github.com/getkirby-v2/panel/releases/tag/2.5.14) and [Kirby 3.4.5](https://github.com/getkirby/kirby/releases/tag/3.4.5). Please update to one of these or a [later version](https://github.com/getkirby/kirby/releases/) to fix the vulnerability. **Note:** Kirby 2 reaches end of life on December 31, 2020. We therefore recommend to upgrade your Kirby 2 sites to Kirby 3. If you cannot upgrade, we still recommend to update to Kirby 2.5.14. ### Workarounds Kirby 2 sites on older releases can also be patched by applying the [changes from this commit](https://github.com/getkirby-v2/panel/commit/5a569d4e3ddaea2b6628d7ec1472a3e8bc410881). ### Credits Thanks to Thore Imhof of Accenture for reporting the problem.
How to fix CVE-2020-26255
To remediate CVE-2020-26255, upgrade the affected package to a fixed version below.
- —upgrade to 3.4.5 or later
- —upgrade to 2.5.14 or later
Is CVE-2020-26255 being exploited?
Low — EPSS is 1.1%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 3.0.0, < 3.4.5
- from 0, < 2.5.14