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CVE
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CVE-2020-26896Date: (C)2020-10-21   (M)2023-12-22


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 Score and Metrics +CVSS Score and Metrics -

CVSS V3 Severity:CVSS V2 Severity:
CVSS Score : 8.2CVSS Score : 5.8
Exploit Score: 3.9Exploit Score: 8.6
Impact Score: 4.2Impact Score: 4.9
 
CVSS V3 Metrics:CVSS V2 Metrics:
Attack Vector: NETWORKAccess Vector: NETWORK
Attack Complexity: LOWAccess Complexity: MEDIUM
Privileges Required: NONEAuthentication: NONE
User Interaction: NONEConfidentiality: PARTIAL
Scope: UNCHANGEDIntegrity: PARTIAL
Confidentiality: LOWAvailability: NONE
Integrity: HIGH 
Availability: NONE 
  
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

CWE    1
CWE-354

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