CVE-2020-36251 Explained : Impact and Mitigation
Learn about CVE-2020-36251, a vulnerability in ownCloud Server before 10.3.0 that allows attackers to remove access to group shares, impacting data security. Find mitigation steps here.
ownCloud Server before 10.3.0 allows an attacker, who has received non-administrative access to a group share, to remove everyone else's access to that share.
Understanding CVE-2020-36251
This CVE involves a vulnerability in ownCloud Server that enables an attacker with non-administrative access to a group share to revoke access for all other users.
What is CVE-2020-36251?
ownCloud Server prior to version 10.3.0 is susceptible to an exploit where an unauthorized user can eliminate access to a shared group folder for all other users.
The Impact of CVE-2020-36251
The impact of this vulnerability is rated as LOW severity according to the CVSS v3.1 base score of 3.5. The attack complexity is LOW, requiring network access and user interaction, with no impact on availability or confidentiality.
Technical Details of CVE-2020-36251
This section provides more technical insights into the vulnerability.
Vulnerability Description
The vulnerability in ownCloud Server allows an attacker with non-administrative access to a group share to remove access for all other users, potentially leading to unauthorized data exposure or loss.
Affected Systems and Versions
- Product: ownCloud Server
- Versions affected: All versions before 10.3.0
Exploitation Mechanism
The attacker needs to have received non-administrative access to a group share to exploit this vulnerability, enabling them to revoke access for all other users sharing the same folder.
Mitigation and Prevention
Protecting systems from CVE-2020-36251 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Upgrade ownCloud Server to version 10.3.0 or newer to mitigate the vulnerability.
- Regularly review and manage user permissions to prevent unauthorized access.
Long-Term Security Practices
- Implement least privilege access controls to limit user permissions.
- Conduct regular security audits and penetration testing to identify and address vulnerabilities.
Patching and Updates
- Stay informed about security advisories and promptly apply patches released by ownCloud to address known vulnerabilities.