Intelligence online17 sources monitored8 actively exploited 7d26 published 24hChecked recently
Vulnerability record

CVE-2019-18935

Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

CriticalExploitation confirmedCISA KEV Used by ransomware
What should I do?

This vulnerability is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it. If you run Telerik UI for ASP.NET AJAX, fix it now.

CISA required action: Apply updates per vendor instructions.

US federal civilian agencies must remediate by May 3, 2022.

Patch status

Official fix available since

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Description

Progress Telerik UI for ASP.NET AJAX through 2019.3.1023 contains a .NET deserialization vulnerability in the RadAsyncUpload function. This is exploitable when the encryption keys are known due to the presence of CVE-2017-11317 or CVE-2017-11357, or other means. Exploitation can result in remote code execution. (As of 2020.1.114, a default setting prevents the exploit. In 2019.3.1023, but not earlier versions, a non-default setting can prevent exploitation.)

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Affected products

ProductVendorSource
Telerik UI for ASP.NET AJAXProgressKEV

Sources: KEV = CISA Known Exploited Vulnerabilities catalog. Version details have not been published yet.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdateKEV

    CVE-2019-18935 scored CVSS 9.8: Progress Telerik UI for ASP.NET AJAX, Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

    CISA lists this as exploited in the wild and known to be used in ransomware campaigns. Unpatched Telerik UI for ASP.NET AJAX systems are exposed to active attacks now.

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdateKEV

    Patch released for CVE-2019-18935: Progress Telerik UI for ASP.NET AJAX, Progress Telerik UI for ASP.NET AJAX Deserialization of Untrusted Data Vulnerability

    An official fix is now available for Progress Telerik UI for ASP.NET AJAX. This vulnerability is being exploited, so apply it promptly.

    Basis: NVD patch reference

1 earlier event is available with a subscription. See plans.

Coverage

We have not published a story about this vulnerability yet.

References

  • nvd.nist.gov https://nvd.nist.gov/vuln/detail/CVE-2019-18935
  • packetstormsecurity.com http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html
  • packetstormsecurity.com http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html
  • codewhitesec.blogspot.com https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html
  • github.com https://github.com/bao7uo/RAU_crypto
  • github.com https://github.com/noperator/CVE-2019-18935
  • know.bishopfox.com https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui
  • bleepingcomputer.com https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/
  • telerik.com https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
  • telerik.com https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2…
  • telerik.com https://www.telerik.com/support/whats-new/release-history
  • cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18935