CVE-2023-39910
High PUBLISHEDThe 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...
Not yet in CISA KEV
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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.
- CVE Published
- Aug 09, 2023
- Exploitation Reported
- Aug 09, 2023
- CVSS
- 7.5 High
- EPSS
- —
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| n/a |
n/a
|
n/a |
Affected |
CVE References
- GitHub — libbitcoin/libbitcoin-explorer github.com · CVE Record https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a34...
- GitHub — libbitcoin/libbitcoin-explorer github.com · CVE Record https://github.com/libbitcoin/libbitcoin-explorer/blob/20eba4db9a8a34...
- GitHub — libbitcoin/libbitcoin-system github.com · CVE Record https://github.com/libbitcoin/libbitcoin-system/blob/a1b777fc51d9c04e...
- milksad.info/disclosure.html milksad.info · CVE Record https://milksad.info/disclosure.html
- news.ycombinator.com/item news.ycombinator.com · CVE Record https://news.ycombinator.com/item?id=37054862
Show 1 more reference
- GitHub — libbitcoin/libbitcoin-explorer github.com · CVE Record https://github.com/libbitcoin/libbitcoin-explorer/wiki/CVE-2023-39910
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CVE First | 2023-08-09 00:00 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Exploitation Status
Exploited in the wild
Recorded 2023-08-09 00:00:00 UTC · CVE
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
00:00 UTC almost 3 years ago00:00 UTC · almost 3 years ago
Added to KEVIntel KEV Feed
High-confidence, third-party attested exploitation
-
00:00 UTC almost 3 years ago00:00 UTC · almost 3 years ago
CVE published
Vulnerability disclosed publicly
-
00:00 UTC almost 3 years ago00:00 UTC · almost 3 years ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2023-39910
{
"cve_id": "CVE-2023-39910",
"title": "The cryptocurrency wallet entropy seeding mechanism used in Libbitcoin Explor...",
"affected_vendor": "Libbitcoin",
"affected_product": "Libbitcoin Explorer",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "High",
"cvss_score": 7.5,
"epss_score": null,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}