CVE Catalog

CVE-2023-39910

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Elevated risk
1.31%

67th percentile - higher than 67% of all known CVEs

Summary

The entropy seeding mechanism used in the cryptocurrency wallet Libbitcoin Explorer versions 3.0.0 to 3.6.0 is weak, allowing remote attackers to recover wallet private keys and steal funds. This issue is known as the Milk Sad.

Risk Assessment

Organizations using affected versions are at risk of fund theft, which can lead to significant financial losses.

Recommendation

It is recommended to move funds to a secure new cryptocurrency wallet and to avoid using 'bx seed' for entropy generation.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS