PT-2023-5500 · Unknown · Libbitcoin Explorer

Lrvick

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Published

2023-08-08

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Updated

2026-01-26

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CVE-2023-39910

CVSS v2.0
7.8
VectorAV:N/AC:L/Au:N/C:C/I:N/A:N
Name of the Vulnerable Software and Affected Versions Libbitcoin Explorer versions 3.0.0 through 3.6.0
Description The issue is related to the use of a weak cryptocurrency wallet entropy seeding mechanism in Libbitcoin Explorer, also known as the Milk Sad issue. This weakness allows remote attackers to recover wallet private keys generated from "bx seed" entropy output and steal funds. The use of an mt19937 Mersenne Twister PRNG restricts the internal entropy to 32 bits regardless of settings. It has been reported that this issue was exploited in the wild in June and July 2023.
Recommendations For versions 3.0.0 through 3.6.0, affected users need to move funds to a secure new cryptocurrency wallet. As a temporary workaround, consider avoiding the use of the 
bx seed
command until a patch is available. Restrict access to the vulnerable 
seed
command to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Weakness Enumeration

CWE-338

Related Identifiers

BDU:2023-06146
CVE-2023-39910

Affected Products

Libbitcoin Explorer