CVE-2017-9248 on CISA KEV

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

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.telerik.com — http://www.telerik.com/support/kb/aspnet-ajax/details/cryptographic-weakness
• www.exploit-db.com — https://www.exploit-db.com/exploits/43873/
• www.telerik.com — http://www.telerik.com/blogs/security-alert-for-telerik-ui-for-asp.net-ajax-and-…
• www.securityfocus.com — http://www.securityfocus.com/bid/99965

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / n/a	n/a

06Detection

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