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Gladinet CentreStack and Triofox 0-Day Flaw Under Active Attack

Gladinet CentreStack and Triofox are currently vulnerable due to an unauthenticated local file inclusion flaw, identified as CVE-2025-11371 . This flaw permits attackers to read sensitive files without authentication. By obtaining the machine key,…

MBy Madison DrakeOct 10, 20252 min read

Gladinet CentreStack and Triofox are currently vulnerable due to an unauthenticated local file inclusion flaw, identified as CVE-2025-11371 . This flaw permits attackers to read sensitive files without authentication. By obtaining the machine key, attackers can exploit a view state deserialization bug to execute code on the server. No official patch is available yet, necessitating the immediate application of a workaround.

CVE Identifier Vulnerability Type Affected Products CVSS 3.1 Score

CVE-2025-11371 Local File Inclusion CentreStack, Triofox 9.1

On September 27, 2025, Huntress's security operations center identified active exploitation attempts on CentreStack instances. The attack targeted systems with versions later than 16.4.10315.56368, which were not affected by a previous deserialization flaw identified as CVE-2025-30406.

The new vulnerability allows attackers to access the Web.config file and extract the machine key, which is then used to perform remote code execution via the view state deserialization method.

Detection timeline for observed exploitation activity

At least three customers experienced in-the-wild attacks, which were detected through unusual base64 payloads in web server processes. The first successful attack occurred at 20:48:37 UTC on September 26, 2025.

Gladinet CentreStack and Triofox are currently vulnerable due to an unauthenticated local file inclusion flaw, identified as CVE-2025-11371 .
Madison Drake · Thehackingpost

In the absence of an official patch, organizations are advised to implement the following workaround:

Disable the temp handler entry in the UploadDownloadProxy Web.config file:

C:\Program Files (x86)\Gladinet Cloud Enterprise\UploadDownloadProxy\Web.config

Removing this entry blocks access to the t.dn endpoint, potentially affecting some file upload or download functionalities. Restart the web service to apply the changes. Gladinet is notifying customers about this workaround while working on a formal patch.

Huntress has provided mitigation advice to affected clients and anticipates a formal patch release soon.

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The following snippet demonstrates how an attacker could exploit the LFI flaw to retrieve the Web.config file:

GET /UploadDownloadProxy/temp?file=../../Web.config HTTP/1.1 Host: vulnerable-centrestack.example.com User-Agent: Mozilla/5.0 Accept: / Connection: close

Once obtained, the attacker can decode the view state key and craft a malicious POST request:

<viewStateBlob> BASE64_ENCODED_DESERIALIZED_PAYLOAD </viewStateBlob>

Administrators should monitor logs for such POST requests and base64-like data within viewStateBlob parameters. This vigilance is crucial until a permanent fix is implemented.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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