OwnCloud/NextCloud Cross-Site Scripting Vulnerability

OwnCloud is a free and open source personal cloud storage solution from OwnCloud Germany.Nextcloud is an open source self-hosted file synchronization and sharing communication application platform.OwnCloud Server and Nextcloud Server are both a server version of one of them. A cross-site scriptin...

Nextcloud: Content Spoofing in "files" app

@ahsantahir reported a Content Spoofing Vulnerability in the Nextcloud Server. The related security advisory can be found at https://nextcloud.com/security/advisory/?id=nc-sa-2017-006 On request of the reporter the issue has only been disclosed limitedly...

Nextcloud Server Content Spoofing Vulnerability

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. Nextcloud Server has a content spoofing vulnerability in the "dav" app. The vulnerability is caused by displaying an abnormal message on the endpoint that puts input under the...

Nextcloud Server Authentication Bypass Vulnerability

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. Nextcloud Server has an authentication bypass vulnerability in SMB. An unauthenticated attacker can exploit this vulnerability to bypass security mechanisms and access the SMB serv...

Nextcloud Server Content Spoofing Vulnerability (CNVD-2016-10259)

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. Nextcloud Server has a content spoofing vulnerability in the "files" app. The vulnerability is caused by displaying an abnormal message on the endpoint that puts inputs under the...

Nextcloud Server Cross-Site Scripting Vulnerability

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. Nextcloud Server has a cross-site scripting vulnerability in the CardDAV image output. An attacker can exploit this vulnerability to launch an XSS attack...

Nextcloud Server Cross-Site Scripting Vulnerability (CNVD-2016-10262)

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. Nextcloud Server has a cross-site scripting vulnerability in Gallery due to Gallery failing to adequately handle exception messages. An attacker can exploit this vulnerability to...

Nextcloud: xss on demo.nextcloud.com due to outdated version

Hello. I found the possibility of introducing "html-tag" and of xss attack in the form of adding comments. Details video. Payload: Browser: Firefox 49.0 OS: Ubuntu 16.04...

Nextcloud: Content spoofing due to the improper behavior of the 403 page in Private Server

@ahsantahir reported a content spoofing vulnerability on an internal server. We've fixed this by adjusting the Apache configuration. On request of the reporter this is disclosed limitedly...

Nextcloud: URI scheme bypass in mail app lead to HTML content spoof and opener control

Bug When we load a HTML mail from mailbox via api, etc http://nextcloud/index.php/apps/mail/accounts//folders/SU5CT1g=/messages//html Our content will be passed to HTML Purifier to strip malicious XSS patterns. After that, an filter will apply to transform acceptable URI schemes http, https, ftp,...

Nextcloud: Dav sharing permissions issue

Steps 1. Create users "Test 1" and "Test 2", make "Test 1" member of "Group A" 2. Share a calendar with group "Group A" editable 3. Share the same calendar with user "Test 2" readonly 4. As "Test 1" open the calendar app and unshare the calendar from "Test 2" - works 5. As "Test 1" open the...

SMB User Authentication Bypass (NC-SA-2016-006)

Nextcloud includes an optional and not by default enabled SMB authentication component that allows to authenticate users against an SMB server.This backend is implemented in a way that it tries to connect to a SMB server and if that succeeded consider the user logged-in.The backend did not proper...

Improper authorization check on removing shares (NC-SA-2016-007)

The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation did simply unshare the file to all users in...

Stored XSS in CardDAV image export (NC-SA-2016-008)

The CardDAV image export functionality as implemented in Nextcloud allows the download of images stored within a vCard. Due to not performing any kind of verification on the image content this is prone to a stored Cross-Site Scripting attack.Note: Nextcloud employs a very strict Content Security...

Reflected XSS in Gallery application (NC-SA-2016-009)

The gallery app was not properly sanitizing exception messages from the Nextcloud server. Due to an endpoint where an attacker could influence the error message this lead to a reflected Cross-Site-Scripting vulnerability...

Nextcloud: Filename enumeration && DoS

@secator reported some enumeration and DoS related issue in Nextcloud Server to us. On request of the reporter the issue has only been disclosed limitedly...

Nextcloud: Bad content-type in response header when getting document can lead to html injection

Bug When request document by genesisid or filename, the content-type field in response header is 'text/html'. And the document content can be anything. So if we upload an odt file with html format and share with other users, it can lead to html injection when others request that file. PoC - img1...

Nextcloud: Bypassing quota limit

Hi an user can upload files despite having a limited quota by changing value of "OC-Total-Length" in header to "A" or adding "X-Expected-Entity-Length" in header with "A" value in normal insuffisant storage we have: PUT /remote.php/webdav/a.jpg HTTP/1.1 Content-Type: application/octet-stream...

Nextcloud 'share.js' Gallery Application XSS Vulnerability - Windows

Nextcloud is prone to a cross-site scripting XSS vulnerability. SPDX-FileCopyrightText: 2016 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE =...

Nextcloud 'share.js' Gallery Application XSS Vulnerability - Linux

Nextcloud is prone to a cross-site scripting XSS vulnerability. SPDX-FileCopyrightText: 2016 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only CPE =...