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GHSA-wgq8-vr6r-mqxm
No affected components available
Impact
It was not clear that it is not possible to change min_signers (i.e. the threshold) with the refresh share functionality (frost_core::keys::refresh module). Using a smaller value would not decrease the threshold, and attempts to sign using a smaller threshold would fail. Additionally, after refreshing the shares with a smaller threshold, it would still be possible to sign with the original threshold; however, this could cause a security loss to the participant's shares. We have not determined the exact security implications of doing so and judged simpler to just validate min_signers.
If for some reason you have done a refresh share procedure with a smaller min_signers we strongly recommend migrating to a new key.
Patches
Updating to 2.2.0 will ensure that the min_signers parameter will be validated. However it won't restore the security of groups refreshed with a smaller min_signers parameters.
Workarounds
You don't need to update if you don't use the refresh share functionality, or if you didn't try to change the min_signers parameter using the refresh share functionality.
References
Thank you BlockSec for reporting the finding
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
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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