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CVE-2021-41178— File Traversal affecting SVG files on Nextcloud Server

Quick assessment

Affected
nextcloud security-advisories
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.

Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud存在跨站脚本漏洞，该漏洞是源于网络系统或产品中缺少身份验证、访问控制、权限管理等安全措施。

CVSS 8.8 · High EPSS 1.78% · P78

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery
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I. Basic Information for CVE-2021-41178

Vulnerability Information
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Vulnerability Title
File Traversal affecting SVG files on Nextcloud Server
Source: CVE Program / CVE List V5
Vulnerability Description
Nextcloud is an open-source, self-hosted productivity platform. Prior to versions 20.0.13, 21.0.5, and 22.2.0, a file traversal vulnerability makes an attacker able to download arbitrary SVG images from the host system, including user provided files. This could also be leveraged into a XSS/phishing attack, an attacker could upload a malicious SVG file that mimics the Nextcloud login form and send a specially crafted link to victims. The XSS risk here is mitigated due to the fact that Nextcloud employs a strict Content-Security-Policy disallowing execution of arbitrary JavaScript. It is recommended that the Nextcloud Server be upgraded to 20.0.13, 21.0.5 or 22.2.0. There are no known workarounds aside from upgrading.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
相对路径遍历
Source: CVE Program / CVE List V5
Vulnerability Title
Nextcloud 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nextcloud是德国Nextcloud公司的一套开源的自托管文件同步和共享的通信应用平台。 Nextcloud存在跨站脚本漏洞，该漏洞是源于网络系统或产品中缺少身份验证、访问控制、权限管理等安全措施。
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
nextcloud security-advisories 20.0.13 -

II. Public POCs for CVE-2021-41178

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III. Intelligence Information for CVE-2021-41178

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Patches & Fixes for CVE-2021-41178 (1)

Vendor Advisories for CVE-2021-41178 (2)

Other References for CVE-2021-41178 (1)

Same Patch Batch · nextcloud · 2021-10-25 · 8 CVEs total

CVE-2021-39225 8.1 HIGH Missing permission check on Deck API
CVE-2021-41177 8.1 HIGH Rate-limits not working on instances without configured memory cache backend
CVE-2021-41179 6.5 MEDIUM Two-Factor Authentication not enforced for pages marked as public
CVE-2021-39221 6.4 MEDIUM XSS in Contacts
CVE-2021-39223 4.8 MEDIUM File path disclosure of shared files in Richdocuments application
CVE-2021-39220 3.5 LOW Bypass of image blocking in Nextcloud Mail
CVE-2021-39224 3.5 LOW File path disclosure of shared files in OfficeOnline application

IV. Related Vulnerabilities

Same product: security-advisories
Same vendor: nextcloud
Same weakness: CWE-23

V. Comments for CVE-2021-41178

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