Cyber Risks · Cisco Talos

Threat Source newsletter for Sept. 17, 2020

Summary: Cisco Talos disclosed a Google Chrome PDFium memory corruption bug that allows out-of-bounds memory access and potential remote code execution when a victim visits a malicious webpage or opens a malicious PDF, and also found several vulnerabilities in the Nitro Pro PDF Reader that could lead to code execution. CISA warned that state-sponsored actors are targeting known vulnerabilities in Pulse and Citrix VPN services for directory-traversal attacks, and urged updates to F5 BIG-IP, Pulse Secure VPN, Citrix VPN and Microsoft Exchange servers.

What you should know: State-sponsored actors are exploiting VPN flaws in Pulse and Citrix to traverse directories and get inside networks, so unpatched F5 BIG-IP, Pulse Secure, Citrix VPN and Exchange systems are the exposed edge.

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