GHSA-2RR5-8Q37-2W7H
Vulnerability from github – Published: 2021-09-27 20:12 – Updated: 2021-09-28 18:46
VLAI
Summary
Improper Restriction of XML External Entity Reference (XXE) in Nokogiri on JRuby
Details
Severity
The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.0) for JRuby users. (This security advisory does not apply to CRuby users.)
Impact
In Nokogiri v1.12.4 and earlier, on JRuby only, the SAX parser resolves external entities by default.
Users of Nokogiri on JRuby who parse untrusted documents using any of these classes are affected:
- Nokogiri::XML::SAX::Parser
- Nokogiri::HTML4::SAX::Parser or its alias Nokogiri::HTML::SAX::Parser
- Nokogiri::XML::SAX::PushParser
- Nokogiri::HTML4::SAX::PushParser or its alias Nokogiri::HTML::SAX::PushParser
Mitigation
JRuby users should upgrade to Nokogiri v1.12.5 or later. There are no workarounds available for v1.12.4 or earlier.
CRuby users are not affected.
Severity
7.5 (High)
{
"affected": [
{
"database_specific": {
"last_known_affected_version_range": "\u003c= 1.12.4"
},
"package": {
"ecosystem": "RubyGems",
"name": "nokogiri"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.12.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-41098"
],
"database_specific": {
"cwe_ids": [
"CWE-611"
],
"github_reviewed": true,
"github_reviewed_at": "2021-09-27T19:20:23Z",
"nvd_published_at": "2021-09-27T20:15:00Z",
"severity": "HIGH"
},
"details": "### Severity\n\nThe Nokogiri maintainers have evaluated this as [**High Severity** 7.5 (CVSS3.0)](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:H/RL:O/RC:C/MAV:N/MAC:L) for JRuby users. (This security advisory does not apply to CRuby users.)\n\n\n### Impact\n\nIn Nokogiri v1.12.4 and earlier, **on JRuby only**, the SAX parser resolves external entities by default.\n\nUsers of Nokogiri on JRuby who parse untrusted documents using any of these classes are affected:\n\n- Nokogiri::XML::SAX::Parser\n- Nokogiri::HTML4::SAX::Parser or its alias Nokogiri::HTML::SAX::Parser\n- Nokogiri::XML::SAX::PushParser\n- Nokogiri::HTML4::SAX::PushParser or its alias Nokogiri::HTML::SAX::PushParser\n\n\n### Mitigation\n\nJRuby users should upgrade to Nokogiri v1.12.5 or later. There are no workarounds available for v1.12.4 or earlier.\n\nCRuby users are not affected.",
"id": "GHSA-2rr5-8q37-2w7h",
"modified": "2021-09-28T18:46:02Z",
"published": "2021-09-27T20:12:47Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-2rr5-8q37-2w7h"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-41098"
},
{
"type": "WEB",
"url": "https://github.com/sparklemotion/nokogiri/commit/5bf729ff3cc84709ee3c3248c981584088bf9f6d"
},
{
"type": "WEB",
"url": "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-41098.yml"
},
{
"type": "PACKAGE",
"url": "https://github.com/sparklemotion/nokogiri"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
],
"summary": "Improper Restriction of XML External Entity Reference (XXE) in Nokogiri on JRuby"
}
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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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