CVE-2019-18935

Known Exploited Public Exploit

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.)

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 93.47% Top 5%
KEV Since 
Vendor Advisory telerik.com Vendor Advisory telerik.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://www.telerik.com/support/whats-new/release-history release notes vendor advisory
https://codewhitesec.blogspot.com/2019/02/telerik-revisited.html not applicable
https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization patch vendor advisory
https://github.com/bao7uo/RAU_crypto third party advisory exploit
https://know.bishopfox.com/research/cve-2019-18935-remote-code-execution-in-telerik-ui third party advisory exploit
https://github.com/noperator/CVE-2019-18935 third party advisory exploit
http://packetstormsecurity.com/files/155720/Telerik-UI-Remote-Code-Execution.html vdb entry third party advisory
https://www.telerik.com/support/whats-new/aspnet-ajax/release-history/ui-for-asp-net-ajax-r1-2020-%28version-2020-1-114%29 release notes
http://packetstormsecurity.com/files/159653/Telerik-UI-ASP.NET-AJAX-RadAsyncUpload-Deserialization.html exploit vdb entry third party advisory
https://www.bleepingcomputer.com/news/security/us-federal-agency-hacked-using-old-telerik-bug-to-steal-data/ press/media coverage

Frequently Asked Questions

What is the severity of CVE-2019-18935?
CVE-2019-18935 has been scored as a critical severity vulnerability.
How to fix CVE-2019-18935?
To fix CVE-2019-18935, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2019-18935 being actively exploited in the wild?
It is confirmed that CVE-2019-18935 is actively exploited. Be extra cautious if you are using vulnerable components. According to its EPSS score, there is a ~93% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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