Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-38491— Kirby vulnerable to Cross-site scripting (XSS) from MIME type auto-detection of uploaded files

Quick assessment

Affected
getkirby kirby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 3.5.8.2版本及之前版本、3.6.0到3.6.6.2版本 、3.7.0到3.7.5.1版本、3.8.0到3.8.4版本、3.9.0到3.9.5版本存在跨站脚本漏洞，该漏洞源于具有 Kirby 面板写入权限的编辑者可以上传具有未知文件扩展名的文件。

CVSS 5.7 · Medium EPSS 0.62% · P48
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-38491

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Kirby vulnerable to Cross-site scripting (XSS) from MIME type auto-detection of uploaded files
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is a content management system. A vulnerability in versions prior to 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6 affects all Kirby sites that might have potential attackers in the group of authenticated Panel users or that allow external visitors to upload an arbitrary file to the content folder. Kirby sites are not affected if they don't allow file uploads for untrusted users or visitors or if the file extensions of uploaded files are limited to a fixed safe list. The attack requires user interaction by another user or visitor and cannot be automated. An editor with write access to the Kirby Panel could upload a file with an unknown file extension like `.xyz` that contains HTML code including harmful content like `<script>` tags. The direct link to that file could be sent to other users or visitors of the site. If the victim opened that link in a browser where they are logged in to Kirby and the file had not been opened by anyone since the upload, Kirby would not be able to send the correct MIME content type, instead falling back to `text/html`. The browser would then run the script, which could for example trigger requests to Kirby's API with the permissions of the victim. The issue was caused by the underlying `Kirby\Http\Response::file()` method, which didn't have an explicit fallback if the MIME type could not be determined from the file extension. If you use this method in site or plugin code, these uses may be affected by the same vulnerability. The problem has been patched in Kirby 3.5.8.3, 3.6.6.3, 3.7.5.2, 3.8.4.1, and 3.9.6. In all of the mentioned releases, the maintainers have fixed the affected method to use a fallback MIME type of `text/plain` and set the `X-Content-Type-Options: nosniff` header if the MIME type of the file is unknown.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Kirby 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 3.5.8.2版本及之前版本、3.6.0到3.6.6.2版本 、3.7.0到3.7.5.1版本、3.8.0到3.8.4版本、3.9.0到3.9.5版本存在跨站脚本漏洞，该漏洞源于具有 Kirby 面板写入权限的编辑者可以上传具有未知文件扩展名的文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkirby kirby < 3.5.8.3 -

II. Public POCs for CVE-2023-38491

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2023-38491

请登录查看更多情报信息。

Patches & Fixes for CVE-2023-38491 (1)

Vendor Advisories for CVE-2023-38491 (1)

Other References for CVE-2023-38491 (5)

Same Patch Batch · getkirby · 2023-07-27 · 5 CVEs total

CVE-2023-38489 7.3 HIGH Kirby vulnerable to Insufficient Session Expiration after a password change
CVE-2023-38488 7.1 HIGH Kirby vulnerable to field injection in the KirbyData text storage handler
CVE-2023-38490 6.8 MEDIUM Kirby XML External Entity (XXE) vulnerability in the XML data handler
CVE-2023-38492 5.3 MEDIUM Kirby vulnerable to denial of service from unlimited password lengths

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-79

V. Comments for CVE-2023-38491

No comments yet

Leave a comment