CVE-2022-39389 Witness Block Parsing DoS Vulnerability in lnd
Attackers can cause lnd nodes to enter a degraded state, preventing channel openings and on-chain detection, potentially leading to fund loss.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2022-39389?
CVE-2022-39389 is a high-severity denial of service vulnerability in lightningnetwork lnd, published on 17 Nov 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Lightning Network Daemon (lnd) is an implementation of a lightning bitcoin overlay network node. All lnd nodes before version `v0.15.4` are vulnerable to a block parsing bug that can cause a node to enter a degraded state once encountered. In this degraded state, nodes can continue to make payments and forward HTLCs, and close out channels. Opening channels is prohibited, and also on chain transaction events will be undetected. This can cause loss of funds if a CSV expiry is researched during a breach attempt or a CLTV delta expires forgetting the funds in the HTLC. A patch is available in `lnd` version 0.15.4. Users are advised to upgrade. Users unable to upgrade may use the `lncli updatechanpolicy` RPC call to increase their CLTV value to a very high amount or increase their fee policies. This will prevent nodes from routing through your node, meaning that no pending HTLCs can be present.
Weakness: CWE-20
Which versions are affected by CVE-2022-39389?
2 open source packages ship an affected version, including github.com/lightningnetwork/lnd. It affects 2 products.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lightningnetwork/lnd Go | All versions | 0.15.4-beta |
github.com/lightningnetwork/lnd Go | All versions | 0.15.4-beta |
Products include Btcd Project Btcd, Lightning Network Daemon Project Lightning Network Daemon.
How do I fix CVE-2022-39389?
Upgrade github.com/lightningnetwork/lnd to 0.15.4-beta 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 CVE-2022-39389 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2022-39389 exists.
Other vulnerabilities in lightningnetwork lnd
Sources
Also known as GHSA-hc82-w9v8-83pr.