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Vulnerability CVE-2021-41178
Published: 2021-10-25 Modified: 2021-10-26
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. |
Type:
CWE-434 (Unrestricted Upload of File with Dangerous Type)
CVSS2 => (AV:N/AC:L/Au:S/C:P/I:N/A:N)
CVSS Base Score |
Impact Subscore |
Exploitability Subscore |
4/10 |
2.9/10 |
8/10 |
Exploit range |
Attack complexity |
Authentication |
Remote |
Low |
Single time |
Confidentiality impact |
Integrity impact |
Availability impact |
Partial |
None |
None |
References: |
https://hackerone.com/reports/1302155
https://github.com/nextcloud/server/pull/28726
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rf
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