CVE-2023-32319 is a high-severity vulnerability affecting the Nextcloud server, an open-source personal cloud implementation. The vulnerability arises from the absence of brute-force protection on the WebDAV endpoints via the basic authentication header. This flaw allows attackers to brute-force user credentials, especially when the provided username is not formatted as an email address. As a result, unauthorized access may be gained by exploiting this weakness. The severity of this vulnerability is underscored by its CVSS score of 8.1, indicating a high risk level.
The vulnerability has been confirmed to affect all users from version 24.0.0 onward. It has been addressed in the following releases: 24.0.11, 25.0.5, and 26.0.0. Organizations utilizing affected versions should prioritize patching immediately, as the lack of brute-force protection can lead to significant risks, including unauthorized data access and potential data breaches.
Currently, there are no known workarounds for this vulnerability, making it imperative for users to upgrade to a patched version as soon as possible. The urgency for organizations to address this vulnerability cannot be overstated, particularly given the potential for attackers to exploit it for unauthorized access.
As the vulnerability is actively monitored and categorized as high-severity, organizations should remain vigilant and ensure that their Nextcloud deployments are updated promptly to mitigate the risks associated with CVE-2023-32319.
Vulnerability Details
The official description of this vulnerability states that it allows brute-force attacks on user credentials due to missing protections on WebDAV endpoints. The vulnerability is classified under CWE-307, which pertains to improper restriction of excessive authentication attempts. The issue was first published on May 26, 2023.
Technical Analysis
The root cause of this vulnerability is the insufficient protection against brute-force attacks on WebDAV requests, particularly when usernames do not conform to email address formats. The attack vector is identified as network-based, with a low attack complexity, meaning that a relatively low level of skill is required for exploitation. Attackers require low privileges, and no user interaction is necessary for successful exploitation.
The impact on confidentiality and integrity is high, as unauthorized access could lead to sensitive data exposure or modification. However, there is no impact on availability. Organizations must understand the potential consequences of this vulnerability and take immediate steps to remediate it.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to user accounts and sensitive data. This vulnerability allows attackers to exploit weak password policies and brute-force user credentials, which can lead to significant data breaches. The blast radius could extend to all users of the affected Nextcloud versions, raising concerns about data security and compliance with data protection regulations.
Given the high severity, organizations should prioritize patching this vulnerability immediately to safeguard against potential exploitation and data compromise.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include Nextcloud server versions 24.0.0 to 24.0.10 and 25.0.0 to 25.0.4. Users are advised to upgrade to patched versions 24.0.11, 25.0.5, or 26.0.0 to mitigate this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations should implement the following steps: upgrade to Nextcloud server versions 24.0.11, 25.0.5, or 26.0.0. Additionally, organizations should consider conducting a review of their security measures, including password policies and access controls, to ensure robust defense against unauthorized access. For further guidance, organizations can explore penetration testing services that help identify potential vulnerabilities in their systems.
Detection Guidance
Organizations should monitor for unusual login attempts, especially those that may indicate brute-force attacks. Log indicators should include repeated failed login attempts and unusual patterns of access. Behavioral anomalies such as sudden access from unfamiliar IP addresses should also be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2023-32319 lies in its reflection of the ongoing challenges organizations face in securing user authentication mechanisms. This vulnerability highlights the necessity of implementing comprehensive security practices to safeguard against brute-force attacks. Security teams should derive lessons from this incident, ensuring that adequate protections are in place for authentication endpoints. Strategic defensive takeaways include the importance of regular security assessments and proactive vulnerability management to prevent similar issues in the future. For more information, organizations can refer to the following resources:
vulnerability management program and penetration testing methodology to enhance security postures.
AI security best practices also provide insights into mitigating modern security threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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