Attackers Exploit Telerik Vulnerabilities to Deploy Cobalt Strike

Attackers Exploit Telerik Vulnerabilities to Deploy Cobalt Strike
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CySecurity News – Latest Information Security and Hacking Incidents

A hacker called ‘Blue Mockingbird’ is exploiting Telerik UI flaws to breach servers, install Cobalt Strike beacons, and deploy cryptomining malware.  The vulnerability tracked as CVE-2019-18935 with a critical severity score (CVSS v3.1: 9.8), impacts the Telerik UI library for ASP.NET AJAX and is a high-risk deserialization security bug that can lead to remote code execution.  Blue Mockingbird was also identified in May 2020 targeting susceptible Microsoft IIS servers that employed Telerik UI, even though it had been a year after the vendor had published security patches. Earlier this week, Sophos researchers revealed that Blue Mockingbird is leveraging the same flaw to launch new cyberattacks.  To exploit CVE-2019-18935, the hackers must secure the encryption keys that guard Telerik UI’s serialization on the target. This may be done by using CVE-2017-11317 and CVE-2017-11357 or abusing another vulnerability in the target web app.  Sinc[…]Content was cut in order to protect the source.Please visit the source for the rest of the article.

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