In September and October 2024, Ivanti published multiple1 security2 advisories3 regarding security policy bypasses and remote code execution vulnerabilities in their Cloud Services Appliance (CSA) product. It was later revealed by FortiGuard Labs Threat Research's work4 that some threat actors had been actively chaining these vulnerabilities as early as September 9, 2024, before any security advisory or patch was publicly released by Ivanti.
In some compromise scenarios, even though the initial access stemmed from the exploitation of zero-day vulnerabilities, later stages were short of such proficient attacker tradecraft. Threat actors were seen using known malicious tools and noisy payloads for lateral movement, persistence and credential dumping.
Synacktiv's CSIRT was recently in charge of different forensic investigations where the root cause was a vulnerable CSA appliance exposed to the internet. During these engagements, we found a set of open-source tools used by the attacker to achieve its goals. In this article, we take a tour of the OSS toolset from an Ivanti CSA exploiter and discuss related detection capabilities.
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