CVE-2020-26896

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.

Category

8.2
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.20%
Third-Party Advisory github.com Third-Party Advisory linuxfoundation.org Third-Party Advisory linuxfoundation.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://gist.github.com/ariard/6bdeb995565d1cc292753e1ee4ae402d third party advisory
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002857.html mailing list third party advisory patch
https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-October/002855.html third party advisory mailing list

Frequently Asked Questions

What is the severity of CVE-2020-26896?
CVE-2020-26896 has been scored as a high severity vulnerability.
How to fix CVE-2020-26896?
To fix CVE-2020-26896, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-26896 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2020-26896 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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