CVE-2023-27592

See a problem?
Source
https://nvd.nist.gov/vuln/detail/CVE-2023-27592
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-27592.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2023-27592
Aliases
  • GHSA-mqqg-xjhj-wfgw
Published
2023-03-17T20:15:13Z
Modified
2024-06-06T14:19:38.039523Z
Severity
  • 5.4 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

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

Affected packages

Git / github.com/miniflux/v2

Affected ranges

Type
GIT
Repo
https://github.com/miniflux/v2
Events

Affected versions

2.*

2.0.25
2.0.26
2.0.27
2.0.28
2.0.29
2.0.30
2.0.31
2.0.32
2.0.33
2.0.34
2.0.35
2.0.36
2.0.37
2.0.38
2.0.39
2.0.40
2.0.41
2.0.42