CVE-2023-43656 Sandbox escape for instances that have enabled transformation functions in matrix-hookshot
Attackers can escape the vm2 sandbox to execute arbitrary code if JavaScript transformation functions are enabled for untrusted users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-43656?
CVE-2023-43656 is a medium-severity code injection vulnerability in matrix-org matrix-hookshot, published on 27 Sep 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
matrix-hookshot is a Matrix bot for connecting to external services like GitHub, GitLab, JIRA, and more. Instances that have enabled transformation functions (those that have `generic.allowJsTransformationFunctions` in their config), may be vulnerable to an attack where it is possible to break out of the `vm2` sandbox and as a result Hookshot will be vulnerable to this. This problem is only likely to affect users who have allowed untrusted users to apply their own transformation functions. If you have only enabled a limited set of trusted users, this threat is reduced (though not eliminated). Version 4.5.0 and above of hookshot include a new sandbox library which should better protect users. Users are advised to upgrade. Users unable to upgrade should disable `generic.allowJsTransformationFunctions` in the config.
Weakness: CWE-74
Which versions are affected by CVE-2023-43656?
It affects 1 product.
Products include Matrix Hookshot.
How do I fix CVE-2023-43656?
No fix has been published for CVE-2023-43656 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2023-43656 being exploited?
There is no known exploitation of CVE-2023-43656 in the wild and no public exploit code.
Sources
Also known as GHSA-fr97-pv6w-4cj6.