CVE-2017-11357 Telerik User Interface (UI) for ASP.NET AJAX: software flaw
In plain words: A mistake in the software that attackers have found a way to abuse. Depends on the product — see the description and the vendor advisory.
Confirmed exploited by CISA on · US federal patch deadline Feb 16, 2023
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 Insecure Direct Object Reference Vulnerability
- Product
- Telerik User Interface (UI) for ASP.NET AJAX
- CISA description
- Telerik UI for ASP.NET AJAX contains an insecure direct object reference vulnerability in RadAsyncUpload that can result in file uploads in a limited location and/or remote code execution.
- Type of flaw
- Software flaw (CWE-20)
- Confirmed exploited
- Jan 26, 2023 — known to be used in ransomware attacks
- US federal patch deadline
- Feb 16, 2023
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Answering about CVE-2017-11357 ·
Questions about CVE-2017-11357
Is CVE-2017-11357 being exploited?
Yes. CISA added CVE-2017-11357 to its Known Exploited Vulnerabilities catalog on Jan 26, 2023, which means there is reliable evidence of real-world attacks, including by ransomware groups.
How do I fix CVE-2017-11357?
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-2017-11357?
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.