{
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"cveMetadata": {
"cveId": "CVE-2024-1544",
"assignerOrgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
"state": "PUBLISHED",
"assignerShortName": "wolfSSL",
"dateReserved": "2024-02-15T17:38:16.603Z",
"datePublished": "2024-08-27T18:44:52.770Z",
"dateUpdated": "2024-08-27T19:14:35.190Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unknown",
"product": "wolfSSL",
"programFiles": [
"wolfcrypt/src/ecc.c"
],
"vendor": "wolfSSL",
"versions": [
{
"lessThanOrEqual": "5.6.4",
"status": "affected",
"version": "0",
"versionType": "Release"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"user": "00000000-0000-4000-9000-000000000000",
"value": "Florian Sieck, Luca Wilke and Thomas Eisenbarth from Universität zu Lübeck"
}
],
"datePublic": "2024-07-08T17:30:00.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Generating the ECDSA nonce k samples a random number r and then
truncates this randomness with a modular reduction mod n where n is the
order of the elliptic curve. Meaning k = r mod n. The division used
during the reduction estimates a factor q_e by dividing the upper two
digits (a digit having e.g. a size of 8 byte) of r by the upper digit of
n and then decrements q_e in a loop until it has the correct size.
Observing the number of times q_e is decremented through a control-flow
revealing side-channel reveals a bias in the most significant bits of
k. Depending on the curve this is either a negligible bias or a
significant bias large enough to reconstruct k with lattice reduction
methods. For SECP160R1, e.g., we find a bias of 15 bits."
}
],
"value": "Generating the ECDSA nonce k samples a random number r and then \ntruncates this randomness with a modular reduction mod n where n is the \norder of the elliptic curve. Meaning k = r mod n. The division used \nduring the reduction estimates a factor q_e by dividing the upper two \ndigits (a digit having e.g. a size of 8 byte) of r by the upper digit of \nn and then decrements q_e in a loop until it has the correct size. \nObserving the number of times q_e is decremented through a control-flow \nrevealing side-channel reveals a bias in the most significant bits of \nk. Depending on the curve this is either a negligible bias or a \nsignificant bias large enough to reconstruct k with lattice reduction \nmethods. For SECP160R1, e.g., we find a bias of 15 bits."
}
],
"impacts": [
{
"descriptions": [
{
"lang": "en",
"value": "Information Disclosure"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 4.1,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-203",
"description": "CWE-203 Observable Discrepancy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"orgId": "50d2cd11-d01a-48ed-9441-5bfce9d63b27",
"shortName": "wolfSSL",
"dateUpdated": "2024-08-27T18:44:52.770Z"
},
"references": [
{
"url": "https://github.com/wolfSSL/wolfssl/releases/tag/v5.7.2-stable"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "ECDSA nonce bias caused by truncation",
"x_generator": {
"engine": "Vulnogram 0.1.0-dev"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2024-08-27T19:14:00.889289Z",
"id": "CVE-2024-1544",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2024-08-27T19:14:35.190Z"
}
}
]
}
}