CVE-2023-23934 (GCVE-0-2023-23934)

Vulnerability from cvelistv5 – Published: 2023-02-14 19:56 – Updated: 2025-03-10 21:11
VLAI
Title
Wrkzeug's incorrect parsing of nameless cookies leads to __Host- cookies bypass
Summary
Werkzeug is a comprehensive WSGI web application library. Browsers may allow "nameless" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.
Severity
2.6 (Low)
CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
pallets werkzeug Affected: < 2.2.3
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    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q\", \"name\": \"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028\", \"name\": \"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/pallets/werkzeug/releases/tag/2.2.3\", \"name\": \"https://github.com/pallets/werkzeug/releases/tag/2.2.3\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://www.debian.org/security/2023/dsa-5470\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20230818-0003/\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T10:49:07.628Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-23934\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-10T20:57:36.294064Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-10T20:57:37.783Z\"}}], \"cna\": {\"title\": \"Wrkzeug\u0027s incorrect parsing of nameless cookies leads to __Host- cookies bypass\", \"source\": {\"advisory\": \"GHSA-px8h-6qxv-m22q\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 2.6, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"LOW\", \"vectorString\": \"CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"pallets\", \"product\": \"werkzeug\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003c 2.2.3\"}]}], \"references\": [{\"url\": \"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q\", \"name\": \"https://github.com/pallets/werkzeug/security/advisories/GHSA-px8h-6qxv-m22q\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028\", \"name\": \"https://github.com/pallets/werkzeug/commit/cf275f42acad1b5950c50ffe8ef58fe62cdce028\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pallets/werkzeug/releases/tag/2.2.3\", \"name\": \"https://github.com/pallets/werkzeug/releases/tag/2.2.3\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://www.debian.org/security/2023/dsa-5470\"}, {\"url\": \"https://security.netapp.com/advisory/ntap-20230818-0003/\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Werkzeug is a comprehensive WSGI web application library. Browsers may allow \\\"nameless\\\" cookies that look like `=value` instead of `key=value`. A vulnerable browser may allow a compromised application on an adjacent subdomain to exploit this to set a cookie like `=__Host-test=bad` for another subdomain. Werkzeug prior to 2.2.3 will parse the cookie `=__Host-test=bad` as __Host-test=bad`. If a Werkzeug application is running next to a vulnerable or malicious subdomain which sets such a cookie using a vulnerable browser, the Werkzeug application will see the bad cookie value but the valid cookie key. The issue is fixed in Werkzeug 2.2.3.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20: Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2023-08-18T13:06:20.023Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-23934\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-03-10T21:11:36.910Z\", \"dateReserved\": \"2023-01-19T21:12:31.360Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2023-02-14T19:56:22.659Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.