CVE-2025-9795 in tianti 天梯
Summary
by MITRE • 09/02/2025
A vulnerability has been found in xujeff tianti 天梯 up to 2.3. The impacted element is the function ajaxUploadFile of the file src/main/java/com/jeff/tianti/controller/UploadController.java. The manipulation of the argument upfile leads to unrestricted upload. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used.
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Analysis
by VulDB Data Team • 09/05/2025
The vulnerability identified as CVE-2025-9795 represents a critical security flaw in the xujeff tianti 天梯 software version 2.3 and earlier. This issue resides within the upload controller functionality where the ajaxUploadFile method fails to properly validate file uploads, creating a pathway for malicious file execution. The vulnerability specifically targets the upfile argument handling mechanism, which lacks adequate input sanitization and validation controls. Security researchers have confirmed that this flaw allows for unrestricted file upload operations, meaning attackers can bypass normal file type restrictions and potentially execute arbitrary code on the affected system. The vulnerability's remote exploitability makes it particularly dangerous as it can be leveraged without requiring physical access to the target system.
The technical implementation of this vulnerability stems from insufficient validation of the upfile parameter within the UploadController.java file located at src/main/java/com/jeff/tianti/controller/. This flaw falls under the category of unrestricted file upload vulnerabilities, which are classified as CWE-434 within the Common Weakness Enumeration framework. The absence of proper file type checking, size limitations, and content validation creates an environment where attackers can upload malicious files such as web shells, executable binaries, or script files that can be executed within the application context. The vulnerability's exploitation requires minimal technical expertise since the exploit has already been publicly disclosed, making it readily available for threat actors to implement.
From an operational perspective, this vulnerability poses significant risks to organizations utilizing the affected software version. The unrestricted upload capability can lead to complete system compromise, data theft, service disruption, and potential lateral movement within network environments. Attackers can leverage this vulnerability to establish persistent access, deploy additional malware, or use the compromised system as a launch point for attacks against other network resources. The impact extends beyond immediate system compromise to include potential regulatory compliance violations, financial losses, and reputational damage. Organizations running affected versions must urgently assess their exposure and implement immediate mitigations to prevent exploitation.
The mitigation strategy for CVE-2025-9795 requires immediate implementation of multiple defensive measures. Organizations should prioritize updating to the latest available version of the software where this vulnerability has been patched. In the interim, administrators should implement strict file validation mechanisms including MIME type checking, file extension filtering, and content-based validation. The application should enforce secure file upload practices such as storing uploaded files outside the web root directory, implementing proper access controls, and using randomized file names to prevent predictable file paths. Network-level defenses should include implementing web application firewalls to detect and block suspicious upload attempts, while also monitoring for unusual file upload patterns. Additionally, the principle of least privilege should be enforced, ensuring that upload functionality operates with minimal required permissions and that file upload directories have restricted access controls. These measures align with the ATT&CK framework's defensive strategies for preventing malicious file execution and should be implemented as part of a comprehensive security posture to address the unrestricted upload threat vector.