CVE-2023-39910

The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explorer 3.0.0 through 3.6.0 is weak, aka the Milk Sad issue

published August 9, 2023

CVSS
—
EPSS
2%
Percentile
78.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.01804 · 78.4th percentile
Published
2023-08-09T00:00Z
EPSS history
Timeline
  • 09 AUG 00:00Z
    The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explorer 3.0.0 through 3.6.0 is weak, aka the Milk Sad issue
    cvelistv5