CVE-2023-32320 : What You Need to Know
Discover the impact and mitigation strategies for CVE-2023-32320, a high-severity vulnerability in Nextcloud Server. Learn about affected versions and how to prevent exploitation.
Nextcloud Server's brute force protection allows someone to send more requests than intended.
Understanding CVE-2023-32320
Nextcloud Server vulnerability allows an attacker to bypass brute force protection by sending excessive authentication requests.
What is CVE-2023-32320?
The CVE-2023-32320 vulnerability in Nextcloud Server allows an attacker to send more authentication requests than intended, potentially bypassing brute force protection.
The Impact of CVE-2023-32320
The vulnerability poses a high severity risk with impacts on confidentiality and integrity, affecting certain versions of Nextcloud Server and Nextcloud Enterprise Server.
Technical Details of CVE-2023-32320
The CVE-2023-32320 vulnerability stems from the improper restriction of excessive authentication attempts in Nextcloud Server, enabling attackers to overload the server with authentication requests.
Vulnerability Description
When multiple requests are sent in parallel, the server executes them all, potentially allowing an attacker to send an unlimited number of requests to bruteforce protected details.
Affected Systems and Versions
Impacted versions include Nextcloud Server >= 25.0.0, < 25.0.7, and Nextcloud Enterprise Server >= 21.0.0, < 21.0.9.12, among others.
Exploitation Mechanism
Attackers exploit the vulnerability by sending parallel requests that surpass the configured limit, enabling them to bruteforce protected details.
Mitigation and Prevention
To mitigate the CVE-2023-32320 vulnerability, immediate steps should be taken to patch affected systems and implement long-term security measures.
Immediate Steps to Take
Apply patches for Nextcloud Server versions 25.0.7 and 26.0.2, as well as Nextcloud Enterprise Server versions 21.0.9.12, 22.2.10.12, 23.0.12.7, 24.0.12.2, 25.0.7, and 26.0.2.
Long-Term Security Practices
Enforce strict authentication controls, monitor authentication attempts, and regularly update software to prevent similar vulnerabilities.
Patching and Updates
Regularly check for security advisories from Nextcloud and apply patches promptly to secure your systems.