Progress · ASP.NET AJAX and Sitefinity
CVE-2017-9248
Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability
What it is
Telerik.Web.UI.dll in Progress Telerik UI for ASP.NET AJAX before R2 2017 SP1 and Sitefinity before 10.0.6412.0 does not properly protect Telerik.Web.UI.DialogParametersEncryptionKey or the MachineKey, which makes it easier for remote attackers to defeat cryptographic protection mechanisms, leading to a MachineKey leak, arbitrary file uploads or downloads, XSS, or ASP.NET ViewState compromise.
CISA: Progress Telerik UI for ASP.NET AJAX and Sitefinity have a cryptographic weakness in Telerik.Web.UI.dll that can be exploited to disclose encryption keys (Telerik.Web.UI.DialogParametersEncryptionKey and/or the MachineKey), perform cross-site-scripting (XSS) attacks, compromise the ASP.NET ViewState, and/or upload and download files.
What to do
Apply updates per vendor instructions.
Deadline for US federal agencies: May 3, 2022
More exploited flaws from Progress
| Added | Vulnerability | Product | Severity | Attack chance |
|---|---|---|---|---|
| Aug 7, 2026 | Command Injection | LoadMaster | Critical 9.6 | 99.8% |
| Mar 3, 2025 | Path Traversal | WhatsUp Gold | Critical 9.8 | 99.3% |
| Nov 18, 2024 | OS Command Injection | Kemp LoadMaster | Critical 10.0 | 95% |
| Sep 16, 2024 | SQL Injection | WhatsUp Gold | Critical 9.8 | 93% |
| Jun 13, 2024 | Authentication Bypass by Spoofing | Telerik Report Server | Critical 9.8 | 97% |
| Oct 5, 2023 | Deserialization of Untrusted Data | WS_FTP Server | Critical 10.0 | 90% |
| Jun 2, 2023 | SQL Injection | MOVEit Transfer | Critical 9.8 | 99.9% |
| Nov 3, 2021 | Deserialization of Untrusted Data | Telerik UI for ASP.NET AJAX | Critical 9.8 | 99.7% |
Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.