CVE-2021-35948 : Security Advisory and Response

Session fixation on password-protected public links in the ownCloud Server before 10.8.0 allows an attacker to bypass the password protection by manipulating controlled cookies.

Understanding CVE-2021-35948

This CVE relates to a session fixation vulnerability in ownCloud Server that could be exploited by attackers to circumvent password protection mechanisms.

What is CVE-2021-35948?

CVE-2021-35948 involves an issue in ownCloud Server where attackers can manipulate cookies to gain unauthorized access to password-protected public links.

The Impact of CVE-2021-35948

The impact of this vulnerability is significant as it enables threat actors to bypass password security controls, potentially leading to unauthorized access to sensitive information stored in ownCloud.

Technical Details of CVE-2021-35948

This section covers the technical aspects of the vulnerability.

Vulnerability Description

The vulnerability allows attackers to force a target client to use a controlled cookie, thus bypassing password protection on public links.

Affected Systems and Versions

ownCloud Server versions prior to 10.8.0 are affected by this vulnerability.

Exploitation Mechanism

Attackers exploit the session fixation vulnerability by manipulating cookies to override password protection on public links.

Mitigation and Prevention

Protecting systems against CVE-2021-35948 is crucial to maintain security.

Immediate Steps to Take

Update ownCloud Server to version 10.8.0 or newer to eliminate this vulnerability.
Monitor for any unauthorized access to password-protected links.

Long-Term Security Practices

Regularly review and update security configurations and protocols.
Educate users about the risks associated with session fixation attacks.

Patching and Updates

Stay informed about security advisories from ownCloud and apply patches promptly to address known vulnerabilities.