CVE-2019-1547 (GCVE-0-2019-1547)
Vulnerability from cvelistv5 – Published: 2019-09-10 16:58 – Updated: 2024-09-16 16:33
VLAI
EPSS
VEX
Title
ECDSA remote timing attack
Summary
Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s).
Severity
No CVSS data available.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-07-19 19:04 UTC
CWE
- Timing side channel
Assigner
References
35 references
Impacted products
Date Public
2019-09-10 00:00
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"sourceIdentifier": "openssl-security@openssl.org",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "NVD-CWE-noinfo"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"microsoft_vex": {
"current_release_date": "2026-04-30T01:54:38.000Z",
"cve": "CVE-2019-1547",
"id": "msrc_CVE-2019-1547",
"initial_release_date": "2019-09-02T00:00:00.000Z",
"product_status:known_affected": "5",
"product_status:known_not_affected": "6",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "ECDSA remote timing attack",
"url": "https://msrc.microsoft.com/csaf/vex/2019/msrc_cve-2019-1547.json",
"version": "5"
},
"nvd": {
"cve": {
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "0DAC8B94-3674-4E4B-9BB0-A16CA0197885",
"versionEndIncluding": "1.0.2s",
"versionStartIncluding": "1.0.2",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "65728FC6-4B4F-4D43-872B-BE1133BB2281",
"versionEndIncluding": "1.1.0k",
"versionStartIncluding": "1.1.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
"matchCriteriaId": "A2ACA227-3992-478E-85C3-023D8AF88A08",
"versionEndIncluding": "1.1.1c",
"versionStartIncluding": "1.1.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Normally in OpenSSL EC groups always have a co-factor present and this is used in side channel resistant code paths. However, in some cases, it is possible to construct a group using explicit parameters (instead of using a named curve). In those cases it is possible that such a group does not have the cofactor present. This can occur even where all the parameters match a known named curve. If such a curve is used then OpenSSL falls back to non-side channel resistant code paths which may result in full key recovery during an ECDSA signature operation. In order to be vulnerable an attacker would have to have the ability to time the creation of a large number of signatures where explicit parameters with no co-factor present are in use by an application using libcrypto. For the avoidance of doubt libssl is not vulnerable because explicit parameters are never used. Fixed in OpenSSL 1.1.1d (Affected 1.1.1-1.1.1c). Fixed in OpenSSL 1.1.0l (Affected 1.1.0-1.1.0k). Fixed in OpenSSL 1.0.2t (Affected 1.0.2-1.0.2s)."
},
{
"lang": "es",
"value": "Normalmente en los grupos EC de OpenSSL siempre tienen un cofactor presente y este es usado en rutas de c\u00f3digo resistentes a canales laterales. Sin embargo, en ciertos casos, es posible construir un grupo usando par\u00e1metros expl\u00edcitos (en lugar de usar una curva nombrada). En esos casos, es posible que dicho grupo no tenga el cofactor presente. Esto puede ocurrir incluso cuando todos los par\u00e1metros coinciden con una curva de nombre conocido. Si es utilizada dicha curva, entonces OpenSSL recurre a rutas de c\u00f3digo resistentes a canales no laterales lo que puede resultar en una recuperaci\u00f3n de clave completa durante una operaci\u00f3n de firma ECDSA. Para que sea vulnerable, un atacante tendr\u00eda que tener la capacidad de cronometrar la creaci\u00f3n de un gran n\u00famero de firmas donde par\u00e1metros expl\u00edcitos sin cofactor presente est\u00e1n en uso mediante una aplicaci\u00f3n que utiliza libcrypto. Para evitar dudas, libssl no es vulnerable porque nunca se utilizan par\u00e1metros expl\u00edcitos. Corregido en OpenSSL versi\u00f3n 1.1.1d (afectada la versi\u00f3n 1.1.1-1.1.1c). Corregido en OpenSSL versi\u00f3n 1.1.0l (afectada la versi\u00f3n 1.1.0-1.1.0k). Corregida en OpenSSL versi\u00f3n 1.0.2t (afectada la versi\u00f3n 1.0.2-1.0.2s)."
}
],
"id": "CVE-2019-1547",
"lastModified": "2024-11-21T04:36:48.160",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "LOW",
"cvssData": {
"accessComplexity": "MEDIUM",
"accessVector": "LOCAL",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 1.9,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:L/AC:M/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 3.4,
"impactScore": 2.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
"userInteractionRequired": false
}
],
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "HIGH",
"attackVector": "LOCAL",
"availabilityImpact": "NONE",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"version": "3.1"
},
"exploitabilityScore": 1.0,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2019-09-10T17:15:11.750",
"references": [
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"source": "openssl-security@openssl.org",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00054.html"
},
{
"source": "openssl-security@openssl.org",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00072.html"
},
{
"source": "openssl-security@openssl.org",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00012.html"
},
{
"source": "openssl-security@openssl.org",
"url": "http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00016.html"
},
{
"source": "openssl-security@openssl.org",
"url": "http://packetstormsecurity.com/files/154467/Slackware-Security-Advisory-openssl-Updates.html"
},
{
"source": "openssl-security@openssl.org",
"tags": [
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],
"url": "https://arxiv.org/abs/1909.01785"
},
{
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"url": "https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=21c856b75d81eff61aa63b4f036bb64a85bf6d46"
},
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},
"cveMetadata": {
"assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"assignerShortName": "openssl",
"cveId": "CVE-2019-1547",
"datePublished": "2019-09-10T16:58:35.307Z",
"dateReserved": "2018-11-28T00:00:00.000Z",
"dateUpdated": "2024-09-16T16:33:05.874Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.