CVE-2021-30465 (GCVE-0-2021-30465)
Vulnerability from cvelistv5 – Published: 2021-05-27 00:00 – Updated: 2024-08-03 22:32
VLAI
EPSS
VEX
Summary
runc before 1.0.0-rc95 allows a Container Filesystem Breakout via Directory Traversal. To exploit the vulnerability, an attacker must be able to create multiple containers with a fairly specific mount configuration. The problem occurs via a symlink-exchange attack that relies on a race condition.
Severity
8.5 (High)
CWE
- n/a
Assigner
References
10 references
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carrera\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H\",\"baseScore\":8.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":6.0}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:S/C:P/I:P/A:P\",\"baseScore\":6.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"SINGLE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":6.8,\"impactScore\":6.4,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-362\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"0.1.1\",\"matchCriteriaId\":\"D522E8C1-E7F0-4A3D-AF68-6D962944A0E5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"949172CC-EBB5-47F6-B987-207C802EED0F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc10:*:*:*:*:*:*\",\"matchCriteriaId\":\"6E890B4D-9270-428B-8143-9B5124F0F96E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"F6D87B50-2849-4F4D-A0F9-4F7EBA3C2647\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3E580E25-F94C-4DA4-8718-15D5F1C3ADAF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"FD565CE0-D9E9-4FD9-8998-8AC55030FAB7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"093326B1-448C-4E3B-886D-CAC8B6813BFF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"F672C421-789D-4F21-B483-DA3EB251BA1D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"E13C190A-D7CE-4204-8CEF-B7317D3FFBF9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc8:*:*:*:*:*:*\",\"matchCriteriaId\":\"15AEA3E2-A82F-4562-AFE6-B83A767B94E7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc9:*:*:*:*:*:*\",\"matchCriteriaId\":\"EB5109FF-7C41-477E-B817-F63F06D866C3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc90:*:*:*:*:*:*\",\"matchCriteriaId\":\"B6B8085F-4B68-47E4-8B4B-FB8C2742EEF4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc91:*:*:*:*:*:*\",\"matchCriteriaId\":\"978AFEA7-C64F-4B24-B314-4E0E7D5C521A\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc92:*:*:*:*:*:*\",\"matchCriteriaId\":\"A134E568-C11C-4D12-9B61-BFA58A080B96\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc93:*:*:*:*:*:*\",\"matchCriteriaId\":\"6FAC79BA-7A2A-45E3-8806-E2C812991ACC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:linuxfoundation:runc:1.0.0:rc94:*:*:*:*:*:*\",\"matchCriteriaId\":\"151570F5-F04B-4F31-AE6E-F364FC8AC01C\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E460AA51-FCDA-46B9-AE97-E6676AA5E194\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"A930E247-0B43-43CB-98FF-6CE7B8189835\"}]}]}],\"references\":[{\"url\":\"http://www.openwall.com/lists/oss-security/2021/05/19/2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing 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"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-08-11T14:28:37+00:00",
"cve": "CVE-2021-30465",
"id": "CVE-2021-30465",
"initial_release_date": "2021-05-19T10:00:00+00:00",
"product_status:fixed": "1188",
"product_status:known_affected": "2",
"product_status:known_not_affected": "95",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "runc: vulnerable to symlink exchange attack",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-30465.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-15T02:32:07Z",
"cve": "CVE-2021-30465",
"id": "CVE-2021-30465",
"initial_release_date": "2023-02-15T03:42:26Z",
"product_status:known_affected": "311",
"product_status:known_not_affected": "42",
"product_status:recommended": "423",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2021-30465",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-30465.json",
"version": "51"
}
}
}
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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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