CVE-2022-39389: Witness Block Parsing DoS Vulnerability in lnd
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.
Affected Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2022-39389?
CVE-2022-39389 has been classified as a medium severity vulnerability.
How do I fix CVE-2022-39389?
To fix CVE-2022-39389, users should upgrade to Lightning Network Daemon version v0.15.4 or later.
What is the impact of CVE-2022-39389?
The impact of CVE-2022-39389 is that affected nodes may enter a degraded state and experience disruptions.
Which software versions are affected by CVE-2022-39389?
CVE-2022-39389 affects all versions of the Lightning Network Daemon prior to v0.15.4 and btcd versions before 0.23.3.
How can I tell if my node is vulnerable to CVE-2022-39389?
You can determine if your node is vulnerable to CVE-2022-39389 by checking if you are using Lightning Network Daemon versions older than v0.15.4.