CVE-2021-41178
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| nextcloud | security-advisories | 20.0.13 | affected |
| nextcloud | security-advisories | >= 21.0.0, < 21.0.5 | affected |
| nextcloud | security-advisories | < 22.2.0 | affected |
Weaknesses
- CWE-23: CWE-23: Relative Path Traversal
- CWE-434: CWE-434: Unrestricted Upload of File with Dangerous Type
ADP Enrichment
CVE Program Container
Additional References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rf
- https://github.com/nextcloud/server/pull/28726
- https://hackerone.com/reports/1302155
- https://security.gentoo.org/glsa/202208-17
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-jp9c-vpr3-m5rf
- https://github.com/nextcloud/server/pull/28726
- https://hackerone.com/reports/1302155
- https://security.gentoo.org/glsa/202208-17
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