GHSA-mcmr-49x3-4jqm ckb type_id script resume may randomly fail
Incorrect handling of cycle limits in CKB type_id scripts causes random verification failures, potentially disrupting blockchain operations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-mcmr-49x3-4jqm?
GHSA-mcmr-49x3-4jqm is a denial of service vulnerability in ckb, published on 2 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Impact
https://github.com/nervosnetwork/ckb/blob/v0.101.2/script/src/verify.rs#L871-L879
TypeIdSystemScript resume handle is not correct when max_cycles is not enough, ScriptError::ExceededMaximumCycles will be raised directly ranther than suspend as expect, and also because script_group execution order is random, so this will happen randomly.
Which versions are affected by GHSA-mcmr-49x3-4jqm?
2 open source packages ship an affected version, including ckb.
| Package | Affected | Fixed in |
|---|---|---|
ckb crates.io | From 0.100.0 | 0.102.0 |
ckb crates.io | From 0.100.0 | 0.102.0 |
How do I fix GHSA-mcmr-49x3-4jqm?
Upgrade ckb to 0.102.0 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is GHSA-mcmr-49x3-4jqm being exploited?
There is no known exploitation of GHSA-mcmr-49x3-4jqm in the wild and no public exploit code.