CVE-2023-27592 (GCVE-0-2023-27592)

Vulnerability from cvelistv5 – Published: 2023-03-17 19:04 – Updated: 2025-02-25 14:53
VLAI?
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`.
Severity ?
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
Impacted products
Vendor Product Version
miniflux v2 Affected: >= 2.0.25, < 2.0.43
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw\", \"name\": \"https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw\", \"tags\": [\"x_refsource_CONFIRM\", \"x_transferred\"]}, {\"url\": \"https://github.com/miniflux/v2/pull/1746\", \"name\": \"https://github.com/miniflux/v2/pull/1746\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76\", \"name\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90\", \"name\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/miniflux/v2/releases/tag/2.0.25\", \"name\": \"https://github.com/miniflux/v2/releases/tag/2.0.25\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://github.com/miniflux/v2/releases/tag/2.0.43\", \"name\": \"https://github.com/miniflux/v2/releases/tag/2.0.43\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}, {\"url\": \"https://miniflux.app/docs/configuration.html#proxy-images\", \"name\": \"https://miniflux.app/docs/configuration.html#proxy-images\", \"tags\": [\"x_refsource_MISC\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T12:16:35.842Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-27592\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-25T14:28:47.043307Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-25T14:28:48.679Z\"}}], \"cna\": {\"title\": \"Stored XSS in Miniflux when opening a broken image due to unescaped ServerError in proxy handler\", \"source\": {\"advisory\": \"GHSA-mqqg-xjhj-wfgw\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 4.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"REQUIRED\", \"attackComplexity\": \"HIGH\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"miniflux\", \"product\": \"v2\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 2.0.25, \u003c 2.0.43\"}]}], \"references\": [{\"url\": \"https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw\", \"name\": \"https://github.com/miniflux/v2/security/advisories/GHSA-mqqg-xjhj-wfgw\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/miniflux/v2/pull/1746\", \"name\": \"https://github.com/miniflux/v2/pull/1746\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76\", \"name\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L76\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90\", \"name\": \"https://github.com/miniflux/v2/blob/b2fd84e0d376a3af6329b9bb2e772ce38a25c31c/ui/proxy.go#L90\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/miniflux/v2/releases/tag/2.0.25\", \"name\": \"https://github.com/miniflux/v2/releases/tag/2.0.25\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/miniflux/v2/releases/tag/2.0.43\", \"name\": \"https://github.com/miniflux/v2/releases/tag/2.0.43\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://miniflux.app/docs/configuration.html#proxy-images\", \"name\": \"https://miniflux.app/docs/configuration.html#proxy-images\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Miniflux is a feed reader. 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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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.