CVE-2023-39910

HIGH EXPLOITED IN THE WILD

Libbitcoin Explorer <3.6.0 - Info Disclosure

Title source: llm

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.

Exploits (5)

nomisec WORKING POC 6 stars
by z1ph1us · poc
https://github.com/z1ph1us/MilkSad-Mnemonic-Generator
gitlab WORKING POC 1 stars
by z1ph1us · poc
https://gitlab.com/z1ph1us/MilkSad-Mnemonic-Generator
nomisec WRITEUP 1 stars
by demining · poc
https://github.com/demining/RAMnesia-Attack
nomisec SUSPICIOUS
by Hitplus · poc
https://github.com/Hitplus/RingSide-Replay-Attack
nomisec SUSPICIOUS
by Hitplus · poc
https://github.com/Hitplus/hitplus.github.io

Scores

CVSS v3 7.5
EPSS 0.0043
EPSS Percentile 62.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

VulnCheck KEV 2023-08-08
InTheWild.io 2023-08-09
CWE
CWE-338
Status published
Products (1)
libbitcoin/libbitcoin_explorer 3.0.0 - 3.6.0
Published Aug 09, 2023
Tracked Since Feb 18, 2026