CVE-2023-27592 (GCVE-0-2023-27592)
Vulnerability from cvelistv5
Published
2023-03-17 19:04
Modified
2025-02-25 14:53
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
Miniflux is a feed reader. Since v2.0.25, Miniflux will automatically proxy images served over HTTP to prevent mixed content errors. When an outbound request made by the Go HTTP client fails, the `html.ServerError` is returned unescaped without the expected Content Security Policy header added to valid responses. By creating an RSS feed item with the inline description containing an `<img>` tag with a `srcset` attribute pointing to an invalid URL like `http:a<script>alert(1)</script>`, we can coerce the proxy handler into an error condition where the invalid URL is returned unescaped and in full. This results in JavaScript execution on the Miniflux instance as soon as the user is convinced (e.g. by a message in the alt text) to open the broken image. An attacker can execute arbitrary JavaScript in the context of a victim Miniflux user when they open a broken image in a crafted RSS feed. This can be used to perform actions on the Miniflux instance as that user and gain administrative access to the Miniflux instance if it is reachable and the victim is an administrator. A patch is available in version 2.0.43. As a workaround sisable image proxy; default value is `http-only`.
References
security-advisories@github.com https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76 Product
security-advisories@github.com https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90 Product
security-advisories@github.com https://github.com/miniflux/v2/pull/1746 Issue Tracking, Patch
security-advisories@github.com https://github.com/miniflux/v2/releases/tag/2.0.25 Release Notes
security-advisories@github.com https://github.com/miniflux/v2/releases/tag/2.0.43 Release Notes
security-advisories@github.com https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw Patch, Vendor Advisory
security-advisories@github.com https://miniflux.app/docs/configuration.html#proxy-images Product
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76 Product
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90 Product
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/pull/1746 Issue Tracking, Patch
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/releases/tag/2.0.25 Release Notes
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/releases/tag/2.0.43 Release Notes
af854a3a-2127-422b-91ae-364da2661108 https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 https://miniflux.app/docs/configuration.html#proxy-images Product
Impacted products
Vendor Product Version
miniflux v2 Version: >= 2.0.25, < 2.0.43
Create a notification for this product.
Show details on NVD website


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Since v2.0.25, Miniflux will automatically proxy images served over HTTP to prevent mixed content errors. \\n\\nWhen an outbound request made by the Go HTTP client fails, the `html.ServerError` is returned unescaped without the expected Content Security Policy header added to valid responses.\\n\\nBy creating an RSS feed item with the inline description containing an `\u003cimg\u003e` tag with a `srcset` attribute pointing to an invalid URL like `http:a\u003cscript\u003ealert(1)\u003c/script\u003e`, we can coerce the proxy handler into an error condition where the invalid URL is returned unescaped and in full.\\n\\nThis results in JavaScript execution on the Miniflux instance as soon as the user is convinced (e.g. by a message in the alt text) to open the broken image.\\n\\nAn attacker can execute arbitrary JavaScript in the context of a victim Miniflux user when they open a broken image in a crafted RSS feed. This can be used to perform actions on the Miniflux instance as that user and gain administrative access to the Miniflux instance if it is reachable and the victim is an administrator.\\n\\nA patch is available in version 2.0.43. As a workaround sisable image proxy; default value is `http-only`.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-79\", \"description\": \"CWE-79: Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2023-03-17T19:04:00.630Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-27592\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-02-25T14:53:55.753Z\", \"dateReserved\": \"2023-03-04T01:03:53.635Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2023-03-17T19:04:00.630Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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