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CVE-2017-9248

Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness

9.8 CRITICALActively exploited (CISA KEV)Public exploitEPSS 75.1%
  1. Published3 Jul 2017
  2. Added to CISA KEV3 Nov 2021
  3. Remediation due3 May 2022
Actively exploited (CISA KEV)

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.

Added to KEV: 3 Nov 2021Federal remediation due: 3 May 2022

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Progress Sitefinity< 10.0.6412.0
Telerik UI For Asp.net Ajax≤ 2017.2.503

Remediation

Fixed in
Progress Sitefinity≥ 10.0.6412.0

References

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Frequently asked

Is CVE-2017-9248 being actively exploited?

Yes. CVE-2017-9248 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Nov 2021.

How severe is CVE-2017-9248?

CVE-2017-9248 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 75.1% probability of exploitation.

Which products are affected by CVE-2017-9248?

Affected products include Progress Sitefinity, Telerik UI For Asp.net Ajax.

How do I fix CVE-2017-9248?

Upgrade affected software to a fixed version, for example Progress Sitefinity 10.0.6412.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2017-9248 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.