CVE-2025-32744 Overview
CVE-2025-32744 is an Unrestricted Upload of File with Dangerous Type vulnerability [CWE-434] affecting Dell AppSync version 4.6.0.0. The flaw allows a remote attacker with high privileges to upload files of dangerous types to the AppSync server. Successful exploitation can lead to remote code execution on the affected system. Dell addressed the issue in security advisory DSA-2025-277.
Critical Impact
An authenticated remote attacker with high privileges can upload malicious files that execute on the AppSync host, compromising the confidentiality, integrity, and availability of protected data and connected storage systems.
Affected Products
- Dell AppSync 4.6.0.0
Discovery Timeline
- 2025-07-21 - CVE-2025-32744 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-32744
Vulnerability Analysis
Dell AppSync provides copy data management for enterprise storage systems, integrating with Dell PowerMax, PowerStore, Unity, and VMAX arrays. The vulnerability stems from insufficient validation of file uploads within the AppSync management interface. The application accepts files without properly restricting dangerous file types, extensions, or content.
An attacker with high-privilege authenticated access can upload executable or script content to the server. Because the vulnerability crosses a scope boundary, exploitation can impact resources beyond the vulnerable component. This makes AppSync a valuable pivot point in environments where it manages storage for production databases and virtualization platforms.
Root Cause
The root cause is improper enforcement of file type restrictions on upload endpoints, categorized as CWE-434 (Unrestricted Upload of File with Dangerous Type). The application fails to validate the MIME type, extension, or magic bytes of uploaded files before storing them in a location where they can be executed or interpreted by the server.
Attack Vector
Exploitation requires network access to the AppSync management interface and valid credentials with high privileges. No user interaction is required. The attacker uploads a dangerous file through an exposed upload function and then triggers execution, typically by requesting the uploaded file through the web server or invoking it via another application component.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Dell Security Update DSA-2025-277 for vendor technical details.
Detection Methods for CVE-2025-32744
Indicators of Compromise
- Unexpected files with executable extensions (.jsp, .war, .sh, .exe, .dll) appearing in AppSync upload or web-accessible directories.
- New administrative sessions from unusual source addresses preceding file upload activity.
- AppSync process spawning shell interpreters (cmd.exe, powershell.exe, /bin/sh, /bin/bash) or scripting engines outside normal operations.
- Outbound network connections from the AppSync server to unfamiliar destinations after upload events.
Detection Strategies
- Monitor AppSync application logs for POST requests to upload endpoints followed by requests fetching the same filenames.
- Alert on file creation events in AppSync web directories that do not correspond to authorized administrative changes.
- Correlate authenticated administrative logins with subsequent file-write and process-execution events on the AppSync host.
Monitoring Recommendations
- Enable verbose audit logging on AppSync administrative endpoints and forward logs to a centralized SIEM.
- Baseline expected child processes of the AppSync service and alert on deviations such as interactive shells or reconnaissance utilities.
- Track authentication events for high-privilege AppSync accounts and investigate access from previously unseen locations or off-hours activity.
How to Mitigate CVE-2025-32744
Immediate Actions Required
- Apply the fixed release referenced in Dell advisory DSA-2025-277 to all AppSync 4.6.0.0 deployments.
- Restrict network access to the AppSync management interface using firewall rules or network segmentation so only trusted administrative hosts can connect.
- Rotate credentials for any high-privilege AppSync accounts, especially if unusual activity is observed in logs.
- Review recent file uploads and administrative activity for signs of prior exploitation.
Patch Information
Dell has released a fixed version and remediation guidance in Dell Security Update DSA-2025-277. Administrators should follow the vendor upgrade path and validate the patch against the target environment before production rollout.
Workarounds
- Limit AppSync administrative access to a dedicated management network and remove any public exposure of the interface.
- Enforce strong authentication and the principle of least privilege for AppSync accounts to reduce the population of users who meet the high-privilege exploitation prerequisite.
- Deploy host-based monitoring on the AppSync server to detect unauthorized file writes and unexpected process execution until patching is complete.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.