CVE-2022-29219 Integer Overflow in Lodestar
Malicious slashing events cause consensus splits in Lodestar nodes due to integer overflow, leading to network forks or invalid block proposals.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-29219?
CVE-2022-29219 is a high-severity vulnerability in ChainSafe lodestar, published on 24 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Lodestar is a TypeScript implementation of the Ethereum Consensus specification. Prior to version 0.36.0, there is a possible consensus split given maliciously-crafted `AttesterSlashing` or `ProposerSlashing` being included on-chain. Because the developers represent `uint64` values as native javascript `number`s, there is an issue when those variables with large (greater than 2^53) `uint64` values are included on chain. In those cases, Lodestar may view valid_`AttesterSlashing` or `ProposerSlashing` as invalid, due to rounding errors in large `number` values. This causes a consensus split, where Lodestar nodes are forked away from the main network. Similarly, Lodestar may consider invalid `ProposerSlashing` as valid, thus including in proposed blocks that will be considered invalid by the network. Version 0.36.0 contains a fix for this issue. As a workaround, use `BigInt` to represent `Slot` and `Epoch` values in `AttesterSlashing` and `ProposerSlashing` objects. `BigInt` is too slow to be used in all `Slot` and `Epoch` cases, so one may carefully use `BigInt` just where necessary for consensus.
Weakness: CWE-190
Which versions are affected by CVE-2022-29219?
2 open source packages ship an affected version, including @chainsafe/lodestar. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@chainsafe/lodestar npm | All versions | 0.36.0 |
@chainsafe/lodestar npm | All versions | 0.36.0 |
Products include Chainsafe Lodestar.
How do I fix CVE-2022-29219?
Upgrade @chainsafe/lodestar to 0.36.0 or later.
Is CVE-2022-29219 being exploited?
There is no known exploitation of CVE-2022-29219 in the wild and no public exploit code.
Sources
Also known as GHSA-cvj7-5f3c-9vg9.