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GHSA-c3h4-9gc2-f7h4
No affected components available
Impact
What kind of vulnerability is it? Who is impacted?
Low permission users using the "Set .dme Path" privilege could potentially set malicious .dme files existing on the host machine to be compiled and executed.
These .dme files could be uploaded via tgstation-server (requiring a separate, isolated privilege) or some other means.
A server configured to execute in BYOND's trusted security level (requiring a third separate, isolated privilege OR being set by another user) could lead to this escalating into remote code execution via BYOND's shell() proc.
The ability to execute this kind of attack is a known side effect of having privileged TGS users, but normally requires multiple privileges with known weaknesses. This vector is not intentional as it does not require control over the where deployment code is sourced from and may not require remote write access to an instance's Configuration directory.
Patches
Has the problem been patched? What versions should users upgrade to?
This problem is patched by pull request #1835 and fixed in versions 6.8.0 and above.
Workarounds
Is there a way for users to fix or remediate the vulnerability without upgrading?
Do not give un-trusted users the Deployment permission to set a .dme path on instances.
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a low impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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