CVE-2022-41934

XWiki Platform Macro Execution Vulnerability

• CVSS 8.8
• CWE-116
• Input Validation and Sanitization
• Remote

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. Any user with view rights on commonly accessible documents including the menu macro can execute arbitrary Groovy, Python or Velocity code in XWiki leading to full access to the XWiki installation due to improper escaping of the macro content and parameters of the menu macro. The problem has been patched in XWiki 14.6RC1, 13.10.8 and 14.4.3. The patch (commit `2fc20891`) for the document `Menu.MenuMacro` can be manually applied or a XAR archive of a patched version can be imported. The menu macro was basically unchanged since XWiki 11.6 so on XWiki 11.6 or later the patch for version of 13.10.8 (commit `59ccca24a`) can most likely be applied, on XWiki version 14.0 and later the versions in XWiki 14.6 and 14.4.3 should be appropriate.

CVE

CVE-2022-41934

CWE

CWE-116

CVSS base score

8.8

Published

2022-11-23

OWASP

A05 Security Misconfiguration

Orthogonal defect classification

Function

Code defect classification

Incorrect Functionality

Category

Input Validation and Sanitization

Subcategory

Insecure Direct Object References (IDOR)

Accessibility scope

Remote

Impact

Arbitrary Code Execution

Fixed by upgrading

Yes

Solution

Upgrade XWiki version 14.6RC1, 13.10.8, or 14.4.3.

def execute_macro(macro_content, context):
    """Vulnerable function that demonstrates the security issue."""
    return eval(macro_content)

user_input = "__import__('os').system('ls')"
context = {}
result = execute_macro(user_input, context)
print(result)

import ast

def execute_macro(macro_content, context):
    """Secure function that fixes the vulnerability."""
    escaped_content = escape_macro_content(macro_content)
    return execute_in_context(escaped_content, context)

def escape_macro_content(content):
    """Secure function that fixes the vulnerability."""
    return content.replace("{", "{{").replace("}", "}}")

def execute_in_context(content, context):
    """Secure function that fixes the vulnerability."""
    try:
        evaluated_content = ast.literal_eval(content)
        return f"Executed: {evaluated_content}"
    except ValueError as e:
        return f"Error in evaluation: {e}"

user_input = "__import__('os').system('ls')"
context = {}
result = execute_macro(user_input, context)
print(result)

@misc{vaitp:cve202241934,
  title        = {{XWiki Platform Macro Execution Vulnerability}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2022},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2022-41934},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2022-41934/}}
}