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Exploited vulnerability · CISA KEV

Is CVE-2019-18935 exploited? Yes: in CISA KEV since 3 Nov 2021

Gociux · Progress Telerik UI for ASP.NET AJAX · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2019-18935, Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Nov 2021, 693 days after it was published. It is known to be used in ransomware campaigns. It affects Progress Telerik UI for ASP.NET AJAX. If you run it, CISA's required action is: Apply updates per vendor instructions.

exploitedYesCISA KEV · 3 Nov 2021
ransomwareKnownused in campaigns
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 contains a deserialization of untrusted data vulnerability through RadAsyncUpload which leads to code execution on the server in the context of the w3wp.exe process.

VendorProgress (9 exploited CVEs in KEV)
ProductTelerik UI for ASP.NET AJAX
VulnerabilityProgress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published11 Dec 2019
Added to KEV3 Nov 2021
Reported by (CNA)mitre

What to do

  1. Check whether you run it. Look for Telerik UI for ASP.NET AJAX 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 11 Dec 2019.
  4. Get told next time. Email alerts when CISA adds a CVE for Progress.

References

Questions

Is CVE-2019-18935 being exploited?

Yes. CISA added CVE-2019-18935 to the Known Exploited Vulnerabilities catalog on 3 Nov 2021, which means there is reliable evidence of exploitation in the wild.

Is CVE-2019-18935 used in ransomware attacks?

Yes, CISA lists it as known to be used in ransomware campaigns.

How do I fix CVE-2019-18935?

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 Telerik 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 November 2021 · Progress scorecard · act-now radar.

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