Vulnerability Details : CVE-2020-26896
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.
Products affected by CVE-2020-26896
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:*:*:*:*:*:*:*:*
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:0.11.0:-:*:*:*:*:*:*
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:0.11.0:beta_rc1:*:*:*:*:*:*
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:0.11.0:beta_rc2:*:*:*:*:*:*
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:0.11.0:beta_rc3:*:*:*:*:*:*
- cpe:2.3:a:lightning_network_daemon_project:lightning_network_daemon:0.11.0:beta_rc4:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-26896
0.11%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 46 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-26896
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:N |
8.6
|
4.9
|
NIST | |
|
8.2
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N |
3.9
|
4.2
|
NIST |
CWE ids for CVE-2020-26896
-
The product does not validate or incorrectly validates the integrity check values or "checksums" of a message. This may prevent it from detecting if the data has been modified or corrupted in transmission.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-26896
-
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002855.html
[Lightning-dev] Full Disclosure: CVE-2020-26896 LND "The (un)covert channel"Mailing List;Third Party Advisory
-
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html
[Lightning-dev] CVE-2020-26896: LND Invoice Preimage ExtractionMailing List;Patch;Third Party Advisory
-
https://gist.github.com/ariard/6bdeb995565d1cc292753e1ee4ae402d
public-report-HTLC-collision.txt ยท GitHubThird Party Advisory
Jump to