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THE THREAT
eSentire has identified active exploitation of the Telerik UI vulnerability, tracked as CVE-2019-18935. The Telerik vulnerability allows for the possibility of remote code execution. In the case identified by eSentire, the vulnerability was exploited in order to deliver a crypto-currency mining malware, but exploitation could also allow threat actors to deploy any malicious content, including ransomware. It is highly recommended that organizations apply the official Telerik patches in order to avoid impact.
What we’re doing about it
What you should do about it
Additional information
CVE-2019-18935 was originally released in December of 2019 and is linked to a deserialization issue with .NET JavaScriptSerializer through RadAsyncUpload [3]. Public exploitation of the vulnerability was first reported in mid-May of 2020. Successful exploitation of CVE-2019-18935 requires the use of additional vulnerabilities or prior knowledge of the encryption keys.
Affected Products:
References:
[1] https://www.telerik.com/support/kb/aspnet-ajax/details/allows-javascriptserializer-deserialization
[2] https://docs.telerik.com/devtools/aspnet-ajax/controls/asyncupload/security#recommended-settings