Vulnerability-Lookup

CVE-2021-39156 (GCVE-0-2021-39156)

Vulnerability from cvelistv5 – Published: 2021-08-24 22:30 – Updated: 2024-08-04 01:58

Title

Fragments in Path May Lead to Authorization Policy Bypass

Summary

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio’s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7613 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/istio/istio/security/advisorie…	x_refsource_CONFIRM
https://istio.io/latest/news/security/istio-secur…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
istio	istio	Affected: < 1.9.8 Affected: >= 1.10.0, < 1.10.4 Affected: >= 1.11.0, < 1.11.1	guessed

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2021-39156

Vulnerability from fkie_nvd - Published: 2021-08-24 23:15 - Updated: 2026-06-17 04:03

Severity

8.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r	Third Party Advisory
security-advisories@github.com	https://istio.io/latest/news/security/istio-security-2021-008	Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108	https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r	Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://istio.io/latest/news/security/istio-security-2021-008	Vendor Advisory

Impacted products

Vendor	Product	Version
istio	istio	*
istio	istio	*
istio	istio	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "istio",
          "vendor": "istio",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.9.8"
            },
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              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.10.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.11.0, \u003c 1.11.1"
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      "source": "security-advisories@github.com"
    }
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      "nodes": [
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              "matchCriteriaId": "2FBF48C6-1E39-4692-A652-27E7DCDC81BC",
              "versionEndExcluding": "1.9.8",
              "vulnerable": true
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    },
    {
      "lang": "es",
      "value": "Istio es una plataforma de c\u00f3digo abierto que proporciona una forma uniforme de integrar microservicios, administrar el flujo de tr\u00e1fico entre microservicios, aplicar pol\u00edticas y agregar datos de telemetr\u00eda. Istio versiones 1.11.0, 1.10.3 y por debajo, y versiones 1.9.7 y por debajo, contienen una vulnerabilidad explotable de forma remota en la que una petici\u00f3n HTTP con el par\u00e1metro \"#fragment\" en la ruta puede omitir las pol\u00edticas de autorizaci\u00f3n basadas en la ruta URI de Istio. Los parches est\u00e1n disponibles en Istio versi\u00f3n 1.11.1, Istio versi\u00f3n 1.10.4 e Istio versi\u00f3n 1.9.8. Como soluci\u00f3n, puede escribirse un filtro Lua para normalizar la ruta."
    }
  ],
  "id": "CVE-2021-39156",
  "lastModified": "2026-06-17T04:03:12.743",
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  },
  "published": "2021-08-24T23:15:10.413",
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      "source": "security-advisories@github.com",
      "tags": [
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      ],
      "url": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r"
    },
    {
      "source": "security-advisories@github.com",
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        "Vendor Advisory"
      ],
      "url": "https://istio.io/latest/news/security/istio-security-2021-008"
    },
    {
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  "vulnStatus": "Modified",
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      "description": [
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          "value": "CWE-863"
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      ],
      "source": "security-advisories@github.com",
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          "lang": "en",
          "value": "CWE-706"
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      ],
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    }
  ]
}

GHSA-HQXW-MM44-GC4R

Vulnerability from github – Published: 2021-08-30 16:16 – Updated: 2022-08-15 20:04

Summary

Istio Fragments in Path May Lead to Authorization Policy Bypass

Details

Impact

Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with #fragment in the path may bypass Istio’s URI path based authorization policies.

Patches

Istio 1.11.1 and above
Istio 1.10.4 and above
Istio 1.9.8 and above

Workarounds

A Lua filter may be written to normalize the path. This is similar to the Path normalization presented in the Security Best Practices guide.

References

More details can be found in the Istio Security Bulletin

For more information

If you have any questions or comments about this advisory, please email us at istio-security-vulnerability-reports@googlegroups.com

Severity

8.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "istio.io/istio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "istio.io/istio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.10.0"
            },
            {
              "fixed": "1.10.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "istio.io/istio"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.11.0"
            },
            {
              "fixed": "1.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.11.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-39156"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-706",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-08-25T22:28:17Z",
    "nvd_published_at": "2021-08-24T23:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nIstio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio\u2019s URI path based authorization policies. \n\n### Patches\n* Istio 1.11.1 and above\n* Istio 1.10.4 and above\n* Istio 1.9.8 and above\n\n### Workarounds\nA Lua filter may be written to normalize the path.  This is similar to the Path normalization presented in the [Security Best Practices](https://istio.io/latest/docs/ops/best-practices/security/#case-normalization) guide.\n\n### References\nMore details can be found in the [Istio Security Bulletin](https://istio.io/latest/news/security/istio-security-2021-008)\n\n### For more information\nIf you have any questions or comments about this advisory, please email us at istio-security-vulnerability-reports@googlegroups.com\n",
  "id": "GHSA-hqxw-mm44-gc4r",
  "modified": "2022-08-15T20:04:30Z",
  "published": "2021-08-30T16:16:14Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-39156"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/istio/istio"
    },
    {
      "type": "WEB",
      "url": "https://istio.io/latest/news/security/istio-security-2021-008"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Istio Fragments in Path May Lead to Authorization Policy Bypass"
}

GSD-2021-39156

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

Aliases

CVE-2021-39156

Aliases

CVE-2021-39156

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-39156",
    "description": "Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with `#fragment` in the path may bypass Istio\u2019s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.",
    "id": "GSD-2021-39156",
    "references": [
      "https://access.redhat.com/errata/RHSA-2021:3273",
      "https://access.redhat.com/errata/RHSA-2021:3272",
      "https://security.archlinux.org/CVE-2021-39156"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
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      "id": "GSD-2021-39156",
      "modified": "2023-12-13T01:23:16.024710Z",
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          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-706"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://istio.io/latest/news/security/istio-security-2021-008",
              "refsource": "MISC",
              "tags": [
                "Vendor Advisory"
              ],
              "url": "https://istio.io/latest/news/security/istio-security-2021-008"
            },
            {
              "name": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.0,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 10.0,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2022-08-12T18:01Z",
      "publishedDate": "2021-08-24T23:15Z"
    }
  }
}

RHSA-2021:3272

Vulnerability from csaf_redhat - Published: 2021-08-25 09:37 - Updated: 2026-03-18 02:07

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.7.1 security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2021-39156.

CVE-2021-39156

An authorization bypass vulnerability was found in istio/istio. An HTTP request is incorrectly evaluated when a URI #fragment is specified. This flaw allows an attacker to bypass an Istio URI-based authorization rule. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Fixed: 19 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2021:3272

Open the full advisory

RHSA-2021:3273

Vulnerability from csaf_redhat - Published: 2021-08-25 09:37 - Updated: 2026-03-18 02:07

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1.17.1 security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2021-39156.

CVE-2021-39156

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Fixed: 28 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2021:3273

Open the full advisory

RHSA-2021_3272

Vulnerability from csaf_redhat - Published: 2021-08-25 09:37 - Updated: 2024-11-22 17:24

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 2.0.7.1 security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2021-39156.

CVE-2021-39156

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Fixed: 19 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2021:3272

Open the full advisory

RHSA-2021_3273

Vulnerability from csaf_redhat - Published: 2021-08-25 09:37 - Updated: 2024-11-22 17:24

Summary

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.1.17.1 security update

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2021-39156.

CVE-2021-39156

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Fixed: 28 products Known not affected: 4 products

https://access.redhat.com/errata/RHSA-2021:3273

Open the full advisory

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

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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.

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.

Action not permitted

CVE-2021-39156 (GCVE-0-2021-39156)

FKIE_CVE-2021-39156

GHSA-HQXW-MM44-GC4R

Impact

Patches

Workarounds

References

For more information

GSD-2021-39156

RHSA-2021:3272

RHSA-2021:3273

RHSA-2021_3272

RHSA-2021_3273

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour