Nextcloud: Information Exposure Through Directory Listing

Hello. I found open directories on the site https://apps.nextcloud.com, which can be viewed by any unauthorized user. There is an error at https://apps.nextcloud.com/static/. F212856 All directories and files in them, starting with /static/ can be viewed or downloaded with all the content. Perhap...

Nextcloud: Access to all files of remote user through shared file

Steps to reproduce 1. User A shares a file "movie.mp4" with user B. 2. User B uses webdav to access files e.g. foldersync or nautilus 3. share is shown as regular file using webdav. 4. Copy the file and paste it to the same folder still using webdav. 5. A new folder will appear with the name...

Nextcloud: WebDAV Empty Property search leads to full CPU usage

Tested with the following versions: - owncloud:10.0 - nextcloud:12.0 with mariadb in place. A PROFIND nextcloud/remote.php/webdav/ with xml as body causes full CPU utilization of one Apache worker process. in curl form: curl -i --user testuser:testpass -X PROPFIND -d ''...

Nextcloud: bypass of 2FA

Improper protection of the 2FA login made a bypass of the 2FA possible. The bug required to know user credentials but effectively rendered the 2FA ineffective. The issue has been fixed by the Nextcloud team and has been validated by the reporter...

Nextcloud: Password of failed (2FA) login attempt is stored in log

If I try to log in on Webdav with my usual Nextcloud password, it doesn't work due to 2FA. I need an application password. The password of a failed login attempt by any user is stored plain text in the log: ...OCA\\DAV\\Connector\\Sabre\\Auth-validateUserPass'matthes', 'THEPASSWORD'... Even...

Nextcloud: Android content provider exposes password-protected share password hashes

Summary Nextcloud Android client v1.4.3 has a globally available content provider which exposes the bcrypt password hashes for password protected shared files and folders. Description Android apps can use a content provider to handle storage and retrieval of data. Content providers that are...

Nextcloud: ci.nextcloud.com: CVE-2015-5477 BIND9 TKEY Vulnerability + Exploit (Denial of Service)

Hello Team NextCloud, In reference report 217381 I've reported the DDOS attack via DNS Port at OwnCloud.. And it was successfully patched. But now same issue I got at ci.nextcloud.com Proof Of Concept: Here it is the nmap result of ci.nextcloud.com NMap Scan Results: Starting Nmap 7.40...

Nextcloud: Unauthenticated 'display name' information leak on enumeration of login names

I reported this last week through email, but I didn't receive any response so that is why I report this once more. - This is probably not considered as a real security vulnerability, but my customers would like to see this fixed, therefore I report it. Problem: It is possible to get a users...

Nextcloud: Session fixation in password protected public download.

Public downloads protected with a password are vulnerable to a session fixation attack. This finding was discovered during a penetration test of NextCloud version 10.0.2.7. 1 Pre-provision a victim with the attacker controlled cookie values: Firefox cookie manager: www.clouddrive.example FALSE %2...

Nextcloud Multiple XSS Vulnerabilities - Linux

Nextcloud is prone to multiple XSS vulnerabilities SPDX-FileCopyrightText: 2017 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 = "cpe:/a:nextcloud:nextcloudserver";...

Nextcloud Multiple Vulnerabilities-01 (May 2017) - Linux

Nextcloud is prone to multiple vulnerabilities. SPDX-FileCopyrightText: 2017 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 = "cpe:/a:nextcloud:nextcloudserver";...

Nextcloud 'Calender and Addressbook' Information Disclosure Vulnerability - Linux

Nextcloud is prone to an information disclosure vulnerability. SPDX-FileCopyrightText: 2017 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: [FG-VD-17-063] NextCloud Insufficient Attack Protection Vulnerability Notification

Subject: FG-VD-17-063 NextCloud Insufficient Attack Protection Vulnerability Notification ------- Vulnerability Notification May 26, 2017 Tracking Case : FG-VD-17-063 Dear NextCloud, The following information pertains to information discovered by Fortinet's FortiGuard Labs. It has been determined...

Nextcloud: Shared file link - password protection bypass under certain conditions

Summary An unauthenticated remote attacker can bypass password protection on certain shared file types through the file sharing app's publicpreview.php function. Vulnerable URL http://server/nextcloud/index.php/apps/filessharing/ajax/publicpreview.php?x=width&y=height&t=share ID Description...

Nextcloud: HTML injection and limited XSS via logo image upload - Nextcloud 12.0.0

Summary The logo image upload function in Nextcloud Server v12.0.0 does not validate the uploaded file, leading to XSS in certain circumstances. Vulnerable URLs Replace server with the IP address or hostname of your Nextcloud server. File upload -...

Nextcloud Unauthorized Access Vulnerability

Nextcloud is a suite of open source self-hosted file synchronization and sharing communication application platform. An unauthorized access vulnerability exists in Nextcloud. An attacker could use this vulnerability to bypass certain security restrictions and obtain sensitive information, leading...

Nextcloud: IDOR unsubscribe Anyone from NextClouds Newsletters by knowing their Email

Hi Team, I Was Looking around your website and then I found a subdomain newsletter.nextcloud.com on the main page it shows us 3 Options i choose 1st that was Subscribe to our newsletter , Then I click on this Option and I was Taken to https://newsletter.nextcloud.com/?p=subscribe&id=1 The page...

Nextcloud: Email Spoofing Vulnerability from nextcloud.

Hi nextcloud, Here is Shaifullah Shaon BlackEyE, An Ethical Hacker. a white hat cyber security researcher from Bangladesh reporting a serious 3'rd ranking in OWASP security vulnerability on your system. There is an Email Spoofing Vulnerability from nextcloud. Steps to reproduce: 1 Go to...

Nextcloud: RTLO character allowed in shared files

SUMMARY ------------- Hello, I have notices that you do not properly strip the RTLO right to left override character in the sharing page of the file, thus allowing someone to mask the real extension of a file and if the user downloads, then opens the file something may be executed on his machine...

Nextcloud: (Authenticated) RCE by bypassing of the .htaccess blacklist

Storage::copyFromStorage doesn't check the content of a folder it copies against the list of blacklisted files. Meaning that if a user has access to an external storage inc. fed. shares that contains a .htaccess file, he can move the .htaccess file to the local data directory. The attack works on...