CVE-2020-26896 Business logic in n/a
A malicious peer can steal intercepted HTLC funds and compromise receiver privacy by exploiting a preimage release logic flaw in LND.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2020-26896?
CVE-2020-26896 is a high-severity vulnerability in n/a, published on 21 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Prior to 0.11.0-beta, LND (Lightning Network Daemon) had a vulnerability in its invoice database. While claiming on-chain a received HTLC output, it didn't verify that the corresponding outgoing off-chain HTLC was already settled before releasing the preimage. In the case of a hash-and-amount collision with an invoice, the preimage for an expected payment was instead released. A malicious peer could have deliberately intercepted an HTLC intended for the victim node, probed the preimage through a colluding relayed HTLC, and stolen the intercepted HTLC. The impact is a loss of funds in certain situations, and a weakening of the victim's receiver privacy.
Weakness: CWE-354
Which versions are affected by CVE-2020-26896?
It affects 1 product.
Products include Lightning Network Daemon Project Lightning Network Daemon.
How do I fix CVE-2020-26896?
No fix has been published for CVE-2020-26896 yet. Limit exposure of the affected software until one is available.
Is CVE-2020-26896 being exploited?
There is no known exploitation of CVE-2020-26896 in the wild and no public exploit code.