SB2017040510 - Multiple vulnerabilities in nextcloud

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Main Vulnerability Database SB2017040510

SB2017040510 - Multiple vulnerabilities in nextcloud

Published: April 5, 2017 Updated: August 8, 2020

Security Bulletin ID SB2017040510
Severity
Medium
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 20% Low 80%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Incorrect permission assignment for critical resource (CVE-ID: CVE-2017-0884)

The vulnerability allows a remote authenticated user to manipulate data.

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a creation of folders in read-only folders despite lacking permissions issue. Due to a logical error in the file caching layer an authenticated adversary is able to create empty folders inside a shared folder. Note that this only affects folders and files that the adversary has at least read-only permissions for.


2) Information disclosure (CVE-ID: CVE-2017-0885)

The vulnerability allows a remote authenticated user to gain access to sensitive information.

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a error message disclosing existence of file in write-only share. Due to an error in the application logic an adversary with access to a write-only share may enumerate the names of existing files and subfolders by comparing the exception messages.


3) Resource exhaustion (CVE-ID: CVE-2017-0886)

The vulnerability allows a remote authenticated user to perform a denial of service (DoS) attack.

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a Denial of Service attack. Due to an error in the application logic an authenticated adversary may trigger an endless recursion in the application leading to a potential Denial of Service.


4) Input validation error (CVE-ID: CVE-2017-0887)

The vulnerability allows a remote authenticated user to manipulate data.

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a bypass in the quota limitation. Due to not properly sanitizing values provided by the `OC-Total-Length` HTTP header an authenticated adversary may be able to exceed their configured user quota. Thus using more space than allowed by the administrator.


5) Input validation error (CVE-ID: CVE-2017-0888)

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Nextcloud Server before 9.0.55 and 10.0.2 suffers from a Content-Spoofing vulnerability in the "files" app. The top navigation bar displayed in the files list contained partially user-controllable input leading to a potential misrepresentation of information.


Remediation

Install update from vendor's website.

References