PYSEC-2020-42
Vulnerability from pysec - Published: 2020-06-02 21:15 - Updated: 2020-06-03 13:47
VLAI
Details
An issue was discovered in fastecdsa before 2.1.2. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.
Impacted products
| Name | purl | fastecdsa | pkg:pypi/fastecdsa |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "fastecdsa",
"purl": "pkg:pypi/fastecdsa"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4a16daeaf139be20654ef58a9fe4c79dc030458c"
},
{
"fixed": "7b64e3efaa806b4daaf73bb5172af3581812f8de"
},
{
"fixed": "e592f106edd5acf6dacedfab2ad16fe6c735c9d1"
}
],
"repo": "https://github.com/AntonKueltz/fastecdsa",
"type": "GIT"
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.0.0b1",
"1.0.1b1",
"1.0.1b2",
"1.0.1b3",
"1.0.1",
"1.0.2",
"1.0.3",
"1.1.0",
"1.1.1",
"1.1.2",
"1.1.3",
"1.2.1",
"1.3.1",
"1.3.2",
"1.4.1",
"1.4.2",
"1.4.3",
"1.5.1",
"1.5.2",
"1.6.1",
"1.6.2",
"1.6.3",
"1.6.4",
"1.6.5",
"1.7.0",
"1.7.1",
"1.7.2",
"1.7.3",
"1.7.4",
"1.7.5",
"2.0.0",
"2.1.0",
"2.1.1"
]
}
],
"aliases": [
"CVE-2020-12607",
"GHSA-56wv-2wr9-3h9r"
],
"details": "An issue was discovered in fastecdsa before 2.1.2. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. This behavior is not solely a usability problem. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.",
"id": "PYSEC-2020-42",
"modified": "2020-06-03T13:47:00Z",
"published": "2020-06-02T21:15:00Z",
"references": [
{
"type": "FIX",
"url": "https://github.com/AntonKueltz/fastecdsa/commit/4a16daeaf139be20654ef58a9fe4c79dc030458c"
},
{
"type": "FIX",
"url": "https://github.com/AntonKueltz/fastecdsa/commit/7b64e3efaa806b4daaf73bb5172af3581812f8de"
},
{
"type": "REPORT",
"url": "https://github.com/AntonKueltz/fastecdsa/issues/52"
},
{
"type": "FIX",
"url": "https://github.com/AntonKueltz/fastecdsa/commit/e592f106edd5acf6dacedfab2ad16fe6c735c9d1"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-56wv-2wr9-3h9r"
}
]
}
Loading…
Loading…
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.
Loading…
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.
Loading…
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.
Loading…