Skip to main content

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVE-2023-36471

Medium
5.4/10

Summary

Xwiki commons is the common modules used by other XWiki top-level projects. The HTML sanitizer that is included in XWiki since version 14.6-rc-1 allowed "form" and "input" HTML tags. In the context of XWiki, this allows an attacker without script right to either create forms that can be used for phishing attacks or also in the context of a sheet, the attacker could add an input like "{{html}}<input type="hidden" name="content" value="{{groovy}}println(&quot;Hello from Groovy!&quot;)" />{{/html}}" that would allow remote code execution when it is submitted by an admin (the sheet is rendered as part of the edit form). The attacker would need to ensure that the edit form looks plausible, though, which can be non-trivial as without script right the attacker cannot display the regular content of the document. This has been patched by removing the central form-related tags from the list of allowed tags. Users are advised to upgrade. As a workaround, an admin can manually disallow the tags by adding "form, input, select, textarea, button" to the configuration option "xml.htmlElementSanitizer.forbidTags" in the "xwiki.properties" configuration file. This vulnerability affects versions 14.6-rc-1 through 14.10.5, and 15.0-rc-1 through 15.1.

  • LOW
  • NETWORK
  • LOW
  • CHANGED
  • REQUIRED
  • LOW
  • LOW
  • NONE

CWE-79 - Cross Site Scripting

Cross-Site Scripting, commonly referred to as XSS, is the most dominant class of vulnerabilities. It allows an attacker to inject malicious code into a pregnable web application and victimize its users. The exploitation of such a weakness can cause severe issues such as account takeover, and sensitive data exfiltration. Because of the prevalence of XSS vulnerabilities and their high rate of exploitation, it has remained in the OWASP top 10 vulnerabilities for years.

References

Advisory Timeline

  • Published