CVE-2023-39910

Description

The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explorer 3.0.0 through 3.6.0 is weak, aka the Milk Sad issue. The use of an mt19937 Mersenne Twister PRNG restricts the internal entropy to 32 bits regardless of settings. This allows remote attackers to recover any wallet private keys generated from "bx seed" entropy output and steal funds. (Affected users need to move funds to a secure new cryptocurrency wallet.) NOTE: the vendor's position is that there was sufficient documentation advising against "bx seed" but others disagree. NOTE: this was exploited in the wild in June and July 2023.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.23%
Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory github.com Third-Party Advisory milksad.info Third-Party Advisory ycombinator.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a3476949d6fd08a589abda7fde3e3/src/commands/seed.cpp#L44 third party advisory
https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a3476949d6fd08a589abda7fde3e3/src/utility.cpp#L78 third party advisory
https://github.com/libbitcoin/libbitcoin-system/blob/a1b777fc51d9c04e0c7a1dec5cc746b82a6afe64/src/crypto/pseudo_random.cpp#L66C12-L78 third party advisory
https://milksad.info/disclosure.html third party advisory
https://news.ycombinator.com/item?id=37054862 third party advisory
https://github.com/libbitcoin/libbitcoin-explorer/wiki/CVE-2023-39910

Frequently Asked Questions

What is the severity of CVE-2023-39910?
CVE-2023-39910 has been scored as a high severity vulnerability.
How to fix CVE-2023-39910?
To fix CVE-2023-39910, 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-2023-39910 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-39910 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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