CVE-2020-26896 Information

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

Reference

https://gist.github.com/ariard/6bdeb995565d1cc292753e1ee4ae402d https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002855.html https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

HIGH

Base Score

NONE

Base Severity

8.2