CVE-2017-11317 Telerik User Interface (UI) for ASP.NET AJAX: dangerous file upload
In plain words: The program accepts files it should refuse, such as programs disguised as ordinary uploads. The attacker can place and run their own tools on the server.
Confirmed exploited by CISA on · US federal patch deadline May 2, 2022
What to do
- Install Telerik's security update for User Interface (UI) for ASP.NET AJAX. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability
- Product
- Telerik User Interface (UI) for ASP.NET AJAX
- CISA description
- Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX allows remote attackers to perform arbitrary file uploads or execute arbitrary code.
- Type of flaw
- Dangerous file upload (CWE-326)
- Confirmed exploited
- Apr 11, 2022
- US federal patch deadline
- May 2, 2022
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Answering about CVE-2017-11317 ·
Questions about CVE-2017-11317
Is CVE-2017-11317 being exploited?
Yes. CISA added CVE-2017-11317 to its Known Exploited Vulnerabilities catalog on Apr 11, 2022, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2017-11317?
Install Telerik's security update for User Interface (UI) for ASP.NET AJAX. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2017-11317?
Only if you use Telerik User Interface (UI) for ASP.NET AJAX. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.