Cross-site scripting in Nextcloud Server - CVE-2016-9459
Published: March 28, 2017 / Updated: July 18, 2020
Vulnerability identifier: #VU31431
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Clear
CVE-ID: CVE-2016-9459
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Nextcloud
Affected software:
Nextcloud Server
Nextcloud Server
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to read and manipulate data.
Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are vulnerable to a log pollution vulnerability potentially leading to a local XSS. The download log functionality in the admin screen is delivering the log in JSON format to the end-user. The file was delivered with an attachment disposition forcing the browser to download the document. However, Firefox running on Microsoft Windows would offer the user to open the data in the browser as an HTML document. Thus any injected data in the log would be executed.
How to mitigate CVE-2016-9459
Install update from vendor's website.
Sources
- http://www.securityfocus.com/bid/97284
- https://github.com/nextcloud/server/commit/94975af6db1551c2d23136c2ea22866a5b416070
- https://github.com/owncloud/core/commit/044ee072a647636b1a17c89265c7233b35371335
- https://github.com/owncloud/core/commit/b7fa2c5dc945b40bc6ed0a9a0e47c282ebf043e1
- https://github.com/owncloud/core/commit/efa35d621dc7ff975468e636a5d1c153511296dc
- https://hackerone.com/reports/146278
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-002
- https://owncloud.org/security/advisory?id=oc-sa-2016-012