Progress Telerik UI - RCE (CVE-2019-18935)
2722Exploiting IPs reported
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.)
CrowdSec analysis
CVE-2019-18935 is a critical vulnerability in Progress Telerik UI for ASP.NET AJAX that enables remote code execution through a flawed deserialization process in the RadAsyncUpload functionality, especially when encryption keys are exposed or known.
CrowdSec has been tracking this vulnerability and its exploits since 5th of April 2023.
Based on data from the CrowdSec network, nearly all observed exploitation of CVE-2019-18935 is fully opportunistic, with attackers indiscriminately scanning the entire internet. These attacks are automated and lack any form of target selection or reconnaissance. In addition, according to the CrowdSec network, attack volume against CVE-2019-18935 has dipped slightly compared to the previous week. Although still commonly targeted, the decline suggests a cooling-off period. Long-term relevance remains, but attention is waning.
Observed exploitation frequently involves requests crafted to abuse the RadAsyncUpload feature, leveraging the underlying deserialization flaw for code execution.
Exploitation
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Common Weakness Enumeration (CWE)
Protection
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Blocklist
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