XWiki is a powerful open-source collaborative platform used by companies and communities worldwide for knowledge management and group collaboration. Designed to be highly extensible, XWiki offers a range of features for building dynamic web applications and managing complex content structures. Trusted by organizations for its flexibility, XWiki allows users to easily customize and adapt the software for their specific needs. It supports a wide variety of applications such as wikis, blogs, knowledge bases, and more, making it a versatile tool for improving information sharing. As an essential platform for thousands of users globally, maintaining its security is of utmost importance.
Cross-Site Scripting (XSS) is a vulnerability that allows an attacker to inject malicious scripts into web pages viewed by other users. In XWiki, this vulnerability exists through the 'rev' parameter used in the content menu without proper escaping. If successfully exploited, an attacker can execute arbitrary scripts in the context of the user's session, leading to unauthorized actions. This could potentially compromise the confidentiality and integrity of the XWiki installation by allowing unauthorized code execution.
The vulnerability in XWiki arises from a lack of input validation in the 'rev' parameter, which is reflected in the content menu. A crafted URL containing XSS payloads can lead to script execution if a user with the necessary permissions loads the link. When these scripts execute, they may perform actions with the user's privileges, including modifications to user data. The vulnerable endpoint is accessed through specific view paths that include the insecure parameter handling.
If abused by malicious actors, this vulnerability can have numerous adverse effects on an XWiki deployment. Attackers could inject scripts that alter website content, steal user session data, or even perform privileged actions if high-level users are targeted. This could disrupt services, lead to data breaches, and potentially allow further penetration into organizational networks.
REFERENCES
- Upgrade XWiki to version 15.6 RC1, 15.5.1, or 14.10.14 where this vulnerability is patched.
- Implement additional input validation and output encoding mechanisms to prevent injection attacks.
- Regularly update the system and apply security patches from trusted sources.
- Restrict the permissions of user accounts to minimize the impact of potential exploits.
- Enable web application firewalls to help detect and block XSS attacks in web traffic.
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