CVE-2025-63910 Overview
An authenticated arbitrary file upload vulnerability has been identified in Cohesity TranZman Migration Appliance Release 4.0 Build 14614. This security flaw allows attackers who have obtained Administrator privileges to execute arbitrary code on the target system by uploading a specially crafted patch file. The vulnerability stems from insufficient verification of software integrity (CWE-345), enabling malicious payloads to be delivered through the patch upload mechanism.
Critical Impact
Attackers with administrative access can achieve full remote code execution on the TranZman Migration Appliance, potentially compromising data migration operations and sensitive enterprise data in transit.
Affected Products
- Cohesity TranZman Migration Appliance Release 4.0 Build 14614
- Cohesity TranZman (cpe:2.3:a:cohesity:tranzman:4.0:build14614)
Discovery Timeline
- 2026-03-03 - CVE-2025-63910 published to NVD
- 2026-03-05 - Last updated in NVD database
Technical Details for CVE-2025-63910
Vulnerability Analysis
This vulnerability is classified as an Arbitrary File Upload flaw, a type of Code Injection attack that can lead to Remote Code Execution. The TranZman Migration Appliance provides a patch upload functionality intended for legitimate software updates. However, the application fails to properly verify the integrity and authenticity of uploaded patch files before processing them.
The underlying weakness is categorized under CWE-345 (Insufficient Verification of Data Authenticity), indicating that the application does not adequately validate that the patch files originate from a trusted source or have not been tampered with. This allows an authenticated administrator to upload malicious files disguised as legitimate patches.
The network-based attack vector means exploitation can occur remotely, though the requirement for high privileges (administrator access) limits the immediate attack surface. Successful exploitation results in complete compromise of confidentiality, integrity, and availability of the affected system.
Root Cause
The root cause lies in the insufficient verification of data authenticity within the patch upload functionality. The TranZman appliance does not implement proper cryptographic signature verification or integrity checks on uploaded patch files. Without these controls, the system cannot distinguish between legitimate vendor-supplied patches and maliciously crafted files containing arbitrary code.
This design flaw allows authenticated administrators to bypass expected security controls by uploading files that appear to be valid patches but contain malicious payloads that execute with system-level privileges when processed by the appliance.
Attack Vector
The attack requires an authenticated session with Administrator privileges on the TranZman Migration Appliance. An attacker who has compromised administrator credentials or is a malicious insider can exploit this vulnerability through the following attack chain:
- Authenticate to the TranZman web interface with administrator credentials
- Navigate to the patch upload functionality
- Upload a crafted file containing malicious code disguised as a legitimate patch
- The appliance processes the malicious patch file without proper verification
- Arbitrary code executes with the privileges of the TranZman service
Additional technical details and proof-of-concept information can be found in the GitHub CVE Repository and GitHub Gist PoC.
Detection Methods for CVE-2025-63910
Indicators of Compromise
- Unexpected or unauthorized patch files uploaded to the TranZman appliance
- Unusual process execution following patch upload operations
- New or modified files in system directories after patch installation
- Anomalous network connections originating from the TranZman appliance
Detection Strategies
- Monitor patch upload activities and log all administrative actions on the TranZman appliance
- Implement file integrity monitoring on critical system directories
- Alert on any patch installations that do not match known-good vendor checksums
- Review authentication logs for suspicious administrator login patterns
Monitoring Recommendations
- Enable comprehensive audit logging for all administrative operations
- Configure SIEM rules to detect patch upload events followed by unusual system activity
- Establish baseline behavior for the TranZman appliance and alert on deviations
- Monitor for unexpected outbound network connections from the appliance
How to Mitigate CVE-2025-63910
Immediate Actions Required
- Restrict administrative access to the TranZman appliance to only essential personnel
- Implement network segmentation to isolate the TranZman appliance from untrusted networks
- Enable multi-factor authentication for all administrative accounts
- Review and audit all administrator accounts for unauthorized access
- Monitor the Stoneram Documentation for vendor updates
Patch Information
No vendor patch has been confirmed at this time. Organizations should monitor Cohesity's official channels and the Stoneram Documentation for security updates addressing this vulnerability. Until a patch is available, implement the recommended workarounds and compensating controls.
Workarounds
- Limit network access to the TranZman administrative interface using firewall rules
- Implement strict access controls and review administrator account permissions
- Deploy web application firewall (WAF) rules to inspect and filter patch upload requests
- Consider disabling the patch upload functionality if not actively required for operations
- Implement out-of-band verification processes for any patch installations
# Network isolation configuration example
# Restrict TranZman management interface to specific admin networks
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
