SB2021080401 - Multiple vulnerabilities in ownCloud Server

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Main Vulnerability Database SB2021080401

SB2021080401 - Multiple vulnerabilities in ownCloud Server

Published: August 4, 2021

Security Bulletin ID SB2021080401
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 25% Low 75%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-35946)

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote authenticated attacker to escalate privileges on the system.

The vulnerability exists due to the federated share recipient can increase permissions, which leads to security restrictions bypass and privilege escalation.


2) Information disclosure (CVE-ID: CVE-2021-35947)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to excessive data output by the application. A remote authenticated attacker can display the internal path and username of the share owner.


3) Session Fixation (CVE-ID: CVE-2021-35948)

CWE-ID: CWE-384 - Session Fixation

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a local user to compromise the target system.

The vulnerability exists due to the session cookies are not reset after authenticating for public linkse. A remote attacker can obtain sensitive information on the system.


4) Improper Protection of Alternate Path (CVE-ID: CVE-2021-35949)

CWE-ID: CWE-424 - Improper Protection of Alternate Path

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear


The vulnerability allows a remote attacker to compromise the target system.

The vulnerabiity exists due to the permission check for a file drop can be circumvented by using the shareinfo API. A remote authenticated attacker can see the files in the filedrop.


Remediation

Install update from vendor's website.

References