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Exploited vulnerability · CISA KEV

Is CVE-2017-9248 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Progress ASP.NET AJAX and Sitefinity · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2017-9248, Progress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 1584 days after it was published. It affects Progress ASP.NET AJAX and Sitefinity. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity9.8CVSS 3.1 · critical
US federal due3 May 2022BOD 22-01 deadline

What it is

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.

VendorProgress (9 exploited CVEs in KEV)
ProductASP.NET AJAX and Sitefinity
VulnerabilityProgress Telerik UI for ASP.NET AJAX and Sitefinity Cryptographic Weakness Vulnerability
WeaknessCWE-522
Published3 Jul 2017
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for ASP.NET AJAX and Sitefinity in your asset inventory, including appliances and cloud images. Stack check lists every exploited Progress 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 3 Jul 2017.
  4. Get told next time. Email alerts when CISA adds a CVE for Progress.

References

Questions

Is CVE-2017-9248 being exploited?

Yes. CISA added CVE-2017-9248 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2017-9248 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-2017-9248?

Apply updates per vendor instructions. Check Progress's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected ASP.NET AJAX and Sitefinity 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 November 2021 · Progress scorecard · act-now radar.

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