CVE-2023-6784: Progress Sitefinity Information Disclosure

CVE-2023-6784 Overview

A phishing vulnerability exists in Progress Sitefinity CMS that allows a malicious authenticated user to potentially abuse the system for distributing phishing emails. This improper input validation flaw could enable attackers to leverage the legitimate email infrastructure of an organization's Sitefinity installation to send deceptive communications, potentially damaging the organization's reputation and targeting unsuspecting recipients.

Critical Impact

Authenticated attackers can exploit Sitefinity's email functionality to distribute phishing emails, potentially compromising downstream users and damaging organizational trust.

Affected Products

• Progress Sitefinity CMS (multiple versions)
• Organizations using Sitefinity's built-in email distribution features
• Environments where Sitefinity is configured with SMTP email capabilities

Discovery Timeline

• December 20, 2023 - CVE-2023-6784 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-6784

Vulnerability Analysis

This vulnerability is classified under CWE-20 (Improper Input Validation). The core issue lies in insufficient validation of user-supplied input within the Sitefinity content management system's email handling components. When a malicious user with authenticated access to the Sitefinity backend provides crafted input, the system fails to adequately sanitize or restrict the content, allowing the user to manipulate email distribution mechanisms.

The attack requires network access and low-privilege authenticated access to the Sitefinity system. Once authenticated, an attacker can craft malicious payloads that the system processes without proper validation, effectively turning the legitimate CMS into a phishing email distribution platform.

Root Cause

The root cause of this vulnerability stems from improper input validation in Sitefinity's email handling functionality. The system does not adequately validate or sanitize user-controlled input before incorporating it into outgoing email communications. This lack of validation allows authenticated users to inject malicious content or manipulate email parameters that should be restricted.

Attack Vector

The attack vector for CVE-2023-6784 is network-based and requires authenticated access to the Sitefinity CMS. An attacker with valid credentials (even low-privilege access) can exploit the vulnerability through the following general approach:

1. The attacker authenticates to the Sitefinity CMS backend
2. The attacker navigates to functionality that utilizes email distribution features
3. Malicious input is crafted to abuse the email system for phishing purposes
4. The Sitefinity system processes the input without proper validation
5. Phishing emails are sent through the organization's legitimate email infrastructure

For detailed technical information, refer to the Progress Security Advisory.

Detection Methods for CVE-2023-6784

Indicators of Compromise

• Unusual email sending patterns from the Sitefinity application server
• Spike in outbound SMTP traffic from Sitefinity infrastructure
• User complaints about receiving unexpected or suspicious emails from organizational domains
• Audit logs showing abnormal activity in email-related Sitefinity modules

Detection Strategies

• Monitor Sitefinity application logs for anomalous email generation activities
• Implement email gateway monitoring to detect unusual outbound email patterns
• Review authentication logs for suspicious login activity to Sitefinity backend
• Configure alerts for mass email distribution attempts from CMS systems

Monitoring Recommendations

• Enable comprehensive logging for all Sitefinity email-related functionality
• Implement SIEM rules to correlate Sitefinity user activity with email gateway events
• Monitor for changes to email templates or distribution lists within Sitefinity
• Establish baseline metrics for normal email traffic from Sitefinity and alert on deviations

How to Mitigate CVE-2023-6784

Immediate Actions Required

• Update Progress Sitefinity to the latest patched version immediately
• Audit all user accounts with access to email functionality in Sitefinity
• Review recent email activity originating from your Sitefinity installation
• Implement additional access controls to restrict email distribution features to trusted administrators only

Patch Information

Progress has released a security patch addressing CVE-2023-6784. Organizations should consult the Progress Security Advisory for specific version information and patch download instructions. It is recommended to apply the patch during a scheduled maintenance window after testing in a non-production environment.

Workarounds

• Restrict access to email distribution features to only essential administrative users
• Implement network-level controls to limit outbound SMTP access from Sitefinity servers
• Enable additional email authentication mechanisms (SPF, DKIM, DMARC) to help recipients identify legitimate emails
• Consider temporarily disabling email functionality if not critical while awaiting patch deployment