Overview

The vulnerability identified as CVE-2023-47799 is a significant security concern that affects the Mahara system versions prior to 22.10.4 and 23.x prior to 23.04.4. It has the potential to disclose sensitive user information if the experimental HTML bulk export is used. This issue is of particular concern because it poses a threat to user privacy and data security, potentially leading to a system compromise or data leakage.

Vulnerability Summary

CVE ID: CVE-2023-47799
Severity: High (7.5 CVSS Score)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage

Affected Products

Product | Affected Versions

Mahara | before 22.10.4
Mahara | 23.x before 23.04.4

How the Exploit Works

The exploit takes advantage of a flaw in Mahara’s experimental HTML bulk export feature, accessible via the administration interface or the CLI. When the export happens, the cache isn’t cleared after one account’s files are exported, which may lead to the inclusion of images from other accounts in the exported files. If these files are given to the account holders, it results in unauthorized information disclosure.

Conceptual Example Code

A conceptual exploit may involve triggering the HTML bulk export feature with a malicious intent to gather sensitive data. The actual exploit would involve complex steps and interaction with the target system, but here is a simplified conceptual example:

# Login to the Mahara system as an administrator
login_to_mahara --username admin --password passw0rd
# Trigger the HTML bulk export feature
trigger_html_export --account target_account
# Download the exported files
download_export --account target_account

This conceptual example assumes the attacker has gained administrative access to the Mahara system and can trigger the HTML bulk export feature for a target account. The actual exploit would likely involve more sophisticated methods to avoid detection and maximize the impact.

Mitigation

Affected systems should apply the vendor-provided patch to fix this vulnerability. As a temporary mitigation, use a Web Application Firewall (WAF) or Intrusion Detection System (IDS) to monitor and block suspicious activities.