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Exploited vulnerability · CISA KEV

Is CVE-2017-11317 exploited? Yes: in CISA KEV since 11 Apr 2022

Gociux · Telerik User Interface (UI) for ASP.NET AJAX · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-11317, Telerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 11 Apr 2022, 1692 days after it was published. It affects Telerik User Interface (UI) for ASP.NET AJAX. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 11 Apr 2022
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due2 May 2022BOD 22-01 deadline

What it is

Telerik.Web.UI in Progress Telerik UI for ASP.NET AJAX allows remote attackers to perform arbitrary file uploads or execute arbitrary code.

VendorTelerik (2 exploited CVEs in KEV)
ProductUser Interface (UI) for ASP.NET AJAX
VulnerabilityTelerik UI for ASP.NET AJAX Unrestricted File Upload Vulnerability
WeaknessCWE-326
Published23 Aug 2017
Added to KEV11 Apr 2022
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for User Interface (UI) for ASP.NET AJAX in your asset inventory, including appliances and cloud images. Stack check lists every exploited Telerik CVE at once.
  2. Apply the fix. Apply updates per vendor instructions.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 23 Aug 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Telerik.

Other exploited CVEs in User Interface (UI) for ASP.NET AJAX

References

Questions

Is CVE-2017-11317 being exploited?

Yes. CISA added CVE-2017-11317 to the Known Exploited Vulnerabilities catalog on 11 Apr 2022, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-11317 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2017-11317?

Apply updates per vendor instructions. Check Telerik's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected User Interface (UI) for ASP.NET AJAX and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in April 2022 · Telerik scorecard · act-now radar.

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