PYSEC-2021-108
Vulnerability from pysec - Published: 2021-06-29 11:15 - Updated: 2021-07-02 18:56
VLAI
Details
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
Impacted products
| Name | purl | urllib3 | pkg:pypi/urllib3 |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "urllib3",
"purl": "pkg:pypi/urllib3"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2d4a3fee6de2fa45eb82169361918f759269b4ec"
}
],
"repo": "https://github.com/urllib3/urllib3",
"type": "GIT"
},
{
"events": [
{
"introduced": "1.25.4"
},
{
"fixed": "1.26.5"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.25.4",
"1.25.5",
"1.25.6",
"1.25.7",
"1.25.8",
"1.25.9",
"1.25.10",
"1.25.11",
"1.26.0",
"1.26.1",
"1.26.2",
"1.26.3",
"1.26.4"
]
}
],
"aliases": [
"CVE-2021-33503",
"GHSA-q2q7-5pp4-w6pg"
],
"details": "An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
"id": "PYSEC-2021-108",
"modified": "2021-07-02T18:56:20.858344Z",
"published": "2021-06-29T11:15:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-q2q7-5pp4-w6pg"
},
{
"type": "FIX",
"url": "https://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec"
}
]
}
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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.
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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.
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