CVE-2021-29460— Kirby 跨站脚本漏洞
一分钟漏洞结论
影响对象
getkirby kirby
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 存在跨站脚本漏洞，该漏洞源允许写访问权限的编辑器可以上传包含有害内容(如“script”标签)的SVG文件。
公开利用映射 1
ExploitDB · 1
EDB-49808 [webapps]
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一、 漏洞 CVE-2021-29460 基础信息
漏洞信息
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Vulnerability Title
Cross-site scripting (XSS) from unsanitized uploaded SVG files
来源: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open source CMS. An editor with write access to the Kirby Panel can upload an SVG file that contains harmful content like `<script>` tags. The direct link to that file can be sent to other users or visitors of the site. If the victim opens that link in a browser where they are logged in to Kirby, the script will run and can for example trigger requests to Kirby's API with the permissions of the victim. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can escalate their privileges if they get access to the Panel session of an admin user. Depending on your site, other JavaScript-powered attacks are possible. Visitors without Panel access can only use this attack vector if your site allows SVG file uploads in frontend forms and you don't already sanitize uploaded SVG files. The problem has been patched in Kirby 3.5.4. Please update to this or a later version to fix the vulnerability. Frontend upload forms need to be patched separately depending on how they store the uploaded file(s). If you use `File::create()`, you are protected by updating to 3.5.4+. As a work around you can disable the upload of SVG files in your file blueprints.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
来源: 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)
来源: CVE Program / CVE List V5
Vulnerability Title
Kirby 跨站脚本漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 存在跨站脚本漏洞，该漏洞源允许写访问权限的编辑器可以上传包含有害内容(如“script”标签)的SVG文件。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2021-29460 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-29460 厂商安全公告 (1)
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https://github.com/getkirby/kirby/security/advisories/GHSA-qgp4-5qx6-548g x_refsource_CONFIRM
CVE-2021-29460 公开利用代码 (1)
CVE-2021-29460 其他参考 (1)
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https://github.com/getkirby/kirby/releases/tag/3.5.4 x_refsource_MISC
IV. Related Vulnerabilities
V. Comments for CVE-2021-29460
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