CVE-2021-32654 : Exploit Details and Defense Strategies
Discover the impact of CVE-2021-32654, a high-severity vulnerability in Nextcloud Server versions prior to 19.0.11, 20.0.10, and 21.0.2, allowing attackers unauthorized write/read access to Federated File Shares.
A vulnerability, identified as CVE-2021-32654, has been discovered in Nextcloud Server versions prior to 19.0.11, 20.0.10, and 21.0.2. This vulnerability could allow an attacker to gain write/read privileges on any Federated File Share, including public links.
Understanding CVE-2021-32654
This section will provide insights into what CVE-2021-32654 is, its impact, technical details, and mitigation strategies.
What is CVE-2021-32654?
Nextcloud Server, a data storage package, is affected by CVE-2021-32654. Attackers could exploit this vulnerability to obtain unauthorized access to Federated File Shares, compromising data integrity and confidentiality.
The Impact of CVE-2021-32654
The severity of this vulnerability is rated as high, with a CVSS Base Score of 8.1. The attack complexity is high, requiring no privileges, and with a significant impact on availability, confidentiality, and integrity.
Technical Details of CVE-2021-32654
Let's delve into the specific technical aspects of CVE-2021-32654.
Vulnerability Description
The vulnerability allows attackers to escalate their privileges by bypassing authorization controls, granting them unauthorized access to Federated File Shares, potentially leading to data compromise.
Affected Systems and Versions
Nextcloud Server versions prior to 19.0.11, 20.0.10, and 21.0.2 are susceptible to this vulnerability.
Exploitation Mechanism
By leveraging the flaw in the Federated File Share mechanism, attackers can manipulate public links to gain unauthorized write/read privileges.
Mitigation and Prevention
It is crucial to implement immediate steps to address CVE-2021-32654 and prevent potential exploitation.
Immediate Steps to Take
Users are advised to upgrade to the patched versions, specifically versions 19.0.11, 20.0.10, or 21.0.2. Alternatively, disabling federated file sharing can serve as a temporary workaround.
Long-Term Security Practices
To enhance overall security posture, organizations should enforce strong access controls, conduct regular security audits, and stay updated on relevant security advisories.
Patching and Updates
Regularly apply security patches and updates provided by Nextcloud to mitigate known vulnerabilities and enhance system resilience.