CVE-2024-5805: Progress MOVEit Gateway Auth Bypass Flaw

CVE-2024-5805 Overview

CVE-2024-5805 is a critical authentication bypass vulnerability affecting Progress MOVEit Gateway's SFTP modules. This improper authentication flaw (CWE-287) allows unauthenticated attackers to bypass security controls and gain unauthorized access to the file transfer system without valid credentials.

Progress MOVEit is a widely deployed managed file transfer (MFT) solution used by enterprises and government organizations to securely exchange sensitive data. The vulnerability specifically targets the SFTP gateway component, which handles secure file transfer protocol connections. Given MOVEit's history of being targeted by threat actors, including the high-profile Cl0p ransomware campaigns, this vulnerability presents significant risk to organizations relying on MOVEit for sensitive data transfers.

Critical Impact

Unauthenticated remote attackers can bypass authentication controls in MOVEit Gateway SFTP modules, potentially gaining unauthorized access to sensitive file transfer infrastructure and data.

Affected Products

• Progress MOVEit Gateway version 2024.0.0
• MOVEit Gateway SFTP modules

Discovery Timeline

• June 25, 2024 - CVE-2024-5805 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-5805

Vulnerability Analysis

This vulnerability stems from improper authentication implementation in the MOVEit Gateway SFTP modules. The flaw allows attackers to circumvent the normal authentication workflow, gaining access without providing valid credentials. The attack is network-accessible and requires no prior authentication or user interaction, making it particularly dangerous for internet-facing MOVEit Gateway deployments.

The vulnerability enables attackers to achieve high impact on both confidentiality and integrity of the affected system. While availability is not directly impacted, the ability to bypass authentication could lead to data exfiltration, unauthorized file uploads, or manipulation of sensitive data traversing the file transfer system.

Root Cause

The root cause is classified as CWE-287 (Improper Authentication), indicating a fundamental flaw in how the SFTP module validates user identity. The authentication mechanism fails to properly verify credentials or contains logic errors that allow the authentication step to be bypassed entirely. This type of vulnerability typically occurs when:

• Authentication checks can be skipped through crafted requests
• Session handling improperly grants authenticated status
• Credential validation logic contains bypass conditions
• Protocol-level authentication is not properly enforced

Attack Vector

The attack vector is network-based, meaning the vulnerability can be exploited remotely by any attacker who can reach the MOVEit Gateway SFTP service. The attack requires low complexity to execute and does not require any privileges or user interaction. An attacker would target the SFTP listener port and exploit the authentication bypass to gain unauthorized access to the file transfer system.

The vulnerability affects the SFTP module specifically, which typically operates on port 22 (SSH/SFTP). Organizations exposing this service to the internet are at heightened risk. Once authentication is bypassed, attackers could potentially access, modify, or exfiltrate files depending on the permissions associated with the bypassed authentication context.

Detection Methods for CVE-2024-5805

Indicators of Compromise

• Unusual SFTP connection patterns without corresponding valid authentication events
• Log entries showing successful SFTP sessions from unknown or suspicious IP addresses
• Unexpected file access, transfer, or modification activities in MOVEit Gateway logs
• Authentication log anomalies showing session establishment without proper credential validation

Detection Strategies

• Monitor MOVEit Gateway SFTP authentication logs for sessions established without valid credentials
• Implement network monitoring to detect anomalous SFTP traffic patterns to gateway servers
• Deploy intrusion detection rules specifically targeting MOVEit Gateway SFTP authentication anomalies
• Cross-reference SFTP connection logs with authentication databases to identify unauthorized sessions

Monitoring Recommendations

• Enable verbose logging for MOVEit Gateway SFTP modules to capture detailed authentication events
• Implement real-time alerting for any SFTP sessions that bypass normal authentication workflows
• Monitor for unexpected file transfers or access patterns indicative of unauthorized access
• Review network flow data for connections to SFTP ports from untrusted sources

How to Mitigate CVE-2024-5805

Immediate Actions Required

• Upgrade MOVEit Gateway to a patched version as specified in the Progress security advisory
• If immediate patching is not possible, consider temporarily disabling the SFTP module
• Restrict network access to the MOVEit Gateway SFTP service using firewalls or network segmentation
• Audit recent SFTP activity for signs of unauthorized access or data exfiltration

Patch Information

Progress has released a security update to address this vulnerability. Organizations should consult the Progress MOVEit Security Alert for detailed patching instructions and the latest fixed versions. Given the critical nature of this vulnerability and MOVEit's history of exploitation by threat actors, immediate patching is strongly recommended.

Workarounds

• Disable the SFTP module in MOVEit Gateway if not required for business operations
• Implement network-level access controls to restrict SFTP access to trusted IP ranges only
• Deploy web application firewalls or network security appliances to monitor and filter SFTP traffic
• Use VPN or zero-trust network access to limit exposure of SFTP services to the internet

Organizations should prioritize applying the official patch as the primary remediation approach, as workarounds may not fully address the vulnerability and could impact legitimate business operations.