Nextcloud: Add to your nextcloud endpoint is not properly protected

This is related to https://hackerone.com/reports/1173684 The endpoint you hit does have bruteforce protection https://github.com/nextcloud/server/blob/master/apps/federatedfilesharing/lib/Controller/MountPublicLinkController.phpL126 But this is only triggered by finding a share that is password...

Injection Vulnerability

Nextcloud Desktop Client prior to 3.1.3 is vulnerable to resource injection by way of missing validation of URLs, allowing a malicious server to execute remote commands. User interaction is needed for exploitation...

Nextcloud: End to end encryption folder locking is not properly protected

I do not see the endtoendencryption app listed here. But since you advertise it big on your website and in communication. And the clients that also support it are covered I assume this is part of the program as well. 1. userA has end to end encryption setup 2. userB wants to annoy userA 3. userB...

Nextcloud: Android app does not clear end to end encryption keys

userA on serverA sets up end to end encryption on their android device 2. userA has some end to end encrypted data 3. userA removes their account on serverA from their android device for whatever reason 4. attacker evil admin obtains the device of userA 5. attacker evil admin logs in on the...

Nextcloud: End to end encryption public key is not properly verified on Desktop and Android

Since last time when I reported something on multiple platforms you seems to prefer handling it in 1 spot. I now just do one. Let me know if You want me to fill separate for android as well. This issue does not seem to happen on iOS as there a test string is encrypted and decrypted, in short...

Nextcloud: Default Nextcloud allows http federated shares

userA on serverA runs on http only 2. userA sends a federated share to userB on serverB 3. userB is a normal user so he has no clue that there is no secure transport used and accepts the share 4. all the data written to and read from is now no longer protected by TLS Impact While maybe a bit far...

Nextcloud: Session fixation on public talk links

userA shares a talk room and protects it with a password 2. userB opens links but doesn't enter the password yet 3. Attacker steals the cookies from userB 4. userB logs in 5. attacker is now also able to read the conversation etc Impact In short the attacker is able to take over the session of...

Fedora: Security Advisory for nextcloud-client (FEDORA-2021-1ffffa0251)

The remote host is missing an update for the Copyright C 2021 Greenbone Networks GmbH 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-or-later This program is free software; you can...

[SECURITY] Fedora 33 Update: nextcloud-client-3.1.3-1.fc33

Nextcloud-client enables you to connect to your private Nextcloud Server. With it you can create folders in your home directory, and keep the contents of those folders synced with your Nextcloud server. Simply copy a file into the directory and the Nextcloud Client does the rest...

Nextcloud: index.php/apps/files_sharing/shareinfo endpoint is not properly protected

When federated shares between two Nextclouds are created they do not use standard webdav to communciate. But to obtain the filelist they seem to use the SERVER/index.php/apps/filessharing/shareinfo endpoint. Unlike the other endpoint for tokens like public link shares. There is no brute force...

Nextcloud: Trusted server shared secret stored unencrypted in the database

The attack vector here is that somebody gets their hands on your database. When two servers have added each other as trusted server they exchange shared secret token. With this token they can sync down each other user lists. However it seems that this token is stored in plain text in the...

Nextcloud: Default settings leak federated cloud id to lookup server of all users

So with the default settings Nextcloud still sends requests to the lookup server if users update their profile. Even if none of the fields are set to 'published'. I must admit this is somewhat of a surprise as there is no reason for this. As long as the visibility of none of the fields change and...

Nextcloud: Nextcloud update checks leaks information

Hi, I think this is more of a privacy concern than a security concern. However I wanted to check here first. Please direct me to an other suitable location if needed. It is in relation to https://github.com/nextcloud/server/blob/master/lib/private/Updater/VersionCheck.phpL78 This is sending sever...

openSUSE: Security Advisory for nextcloud-desktop (openSUSE-SU-2021:0577-1)

The remote host is missing an update for the Copyright C 2021 Greenbone Networks GmbH 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-or-later This program is free software; you can...

Nextcloud: Attacker can obtain write access to any federated share/public link

Hi mates, I stumbled across this with public links. But the same holds true for any federated share. I will try to describe the link scenario. At first I thought there were more steps and resharing was involved. But it really is very simples: 1. An attacker obtains a public link again plenty of...

Nextcloud: Password policy changes not enforced for existing passwords

So this is two reports in one. Sort of. But they are the same issue, or at least related. 1. When you setup your nextcloud there is no password policy at all. There is the strength indicator. I get the password policy app is not yet active at that point. But a minimum length would not be that...

Nextcloud: Targeted phishing attacks in Login flow v2

Vulnerability description not provided...

OPENSUSE-SU-2021:0577-1 Security update for nextcloud-desktop

This update for nextcloud-desktop fixes the following issues: nextcloud-desktop was updated to 3.1.3: - desktop2884 stable-3.1 Add support for Hirsute - desktop2920 stable-3.1 Validate sensitive URLs to onle allow https schemes. - desktop2926 stable-3.1 Validate the providers ssl certificate -...

Cross-Site Scripting (XSS)

@nextcloud/dialogs is vulnerable to cross-site scripting XSS. A remote attacker is able to inject and execute arbitrary Javascript in a user's browser via a toast message...

Security update for nextcloud-desktop (important)

openSUSE Security Update: Security update for nextcloud-desktop Announcement ID: openSUSE-SU-2021:0577-1 Rating: important References: 1184770 Cross-References: CVE-2021-22879 CVSS scores: CVE-2021-22879 SUSE: 6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Affected Products: openSUSE Leap 15.2 ...