CVE-2023-39910 : The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explorer 3.0.0 through 3.6.0 is weak, aka the Mil

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.

Published 2023-08-09 03:15:45

Updated 2023-09-07 07:15:09

Source MITRE

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2023-39910

EPSS FAQ

0.18%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 56 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2023-39910

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: None Availability: None

CWE ids for CVE-2023-39910

CWE-338 Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)

The product uses a Pseudo-Random Number Generator (PRNG) in a security context, but the PRNG's algorithm is not cryptographically strong.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-39910

https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a3476949d6fd08a589abda7fde3e3/src/utility.cpp#L78

libbitcoin-explorer/src/utility.cpp at 20eba4db9a8a3476949d6fd08a589abda7fde3e3 · libbitcoin/libbitcoin-explorer · GitHub
Third Party Advisory
https://github.com/libbitcoin/libbitcoin-explorer/wiki/CVE-2023-39910

CVE 2023 39910 · libbitcoin/libbitcoin-explorer Wiki · GitHub
https://milksad.info/disclosure.html

Milk Sad: /full write-up
Third Party Advisory
https://github.com/libbitcoin/libbitcoin-system/blob/a1b777fc51d9c04e0c7a1dec5cc746b82a6afe64/src/crypto/pseudo_random.cpp#L66C12-L78

libbitcoin-system/src/crypto/pseudo_random.cpp at a1b777fc51d9c04e0c7a1dec5cc746b82a6afe64 · libbitcoin/libbitcoin-system · GitHub
Third Party Advisory
https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a3476949d6fd08a589abda7fde3e3/src/commands/seed.cpp#L44

libbitcoin-explorer/src/commands/seed.cpp at 20eba4db9a8a3476949d6fd08a589abda7fde3e3 · libbitcoin/libbitcoin-explorer · GitHub
Third Party Advisory
https://news.ycombinator.com/item?id=37054862

Milk Sad Disclosure | Hacker News
Third Party Advisory

Products affected by CVE-2023-39910

Libbitcoin » Libbitcoin Explorer
Versions from including (>=) 3.0.0 and up to, including, (<=) 3.6.0
cpe:2.3:a:libbitcoin:libbitcoin_explorer:*:*:*:*:*:*:*:*
Matching versions

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Vulnerability Details : CVE-2023-39910

Exploit prediction scoring system (EPSS) score for CVE-2023-39910

CVSS scores for CVE-2023-39910

CWE ids for CVE-2023-39910

References for CVE-2023-39910

Products affected by CVE-2023-39910