YesWiki Stored Cross-Site Scripting Scanner

The YesWiki software is a collaborative platform designed to facilitate the creation and management of community-driven information environments. Used often by community groups, educational institutions, and NGOs, it allows the easy setup and customization of wikis for knowledge sharing. It is typically employed for collaborative content generation and dissemination. By providing a user-friendly interface, it is suitable for both tech-savvy and non-technical users. Its modularity and flexibility enable adaptation to diverse user needs and projects. The platform's continuous development ensures that it meets modern web standards and user expectations.

The Cross-Site Scripting (XSS) vulnerability present in YesWiki allows attackers to inject malicious scripts into webpages viewed by other users. This type of stored XSS can enable an attacker to execute arbitrary scripts in the context of other users, potentially leading to data theft or further exploitation. XSS vulnerabilities are significant as they can be used to bypass access controls such as the same-origin policy. This particular vulnerability, when leveraged, can lead to unauthorized actions performed on behalf of the user without their consent or knowledge. The presence of this vulnerability raises serious security concerns that need to be addressed promptly. Generally, its exploitation requires social engineering or a lack of strict input validation.

The technical details of this vulnerability involve the bf_text field within the Forum entry addition feature of YesWiki. By crafting a malicious payload within this field, an attacker can have scripts executed upon submission by any user viewing this entry. The payload exploits YesWiki's insufficient input validation and output encoding mechanisms. Its persistence means any user accessing the relevant page in the future could be affected. The unchecked user input directly into HTML content is the root cause of this vulnerability. Without mitigation, this could allow attackers to perform actions as another user, posing a risk to all users interacting with compromised entries.

Exploiting this vulnerability may lead to sensitive information exposure, unauthorized actions in the context of affected users, and further network penetration. Attackers might conduct phishing attacks through injected scripts, alter page content maliciously, and even redirect users to malicious web pages. The resulting unauthorized access to user sessions could also lead to data corruption or loss. Ultimately, this vulnerability poses a significant risk to the integrity, availability, and confidentiality of user data on YesWiki. It can damage both the platform's credibility and the users' trust.

REFERENCES

• https://huntr.dev/bounties/5f27a9b1-c092-47e2-8092-a81298a4b932/