Security Research
CVE-2025-52287 WSUS Deserialization to RCE: Four-Stage Exploitation via SimpleAuth Cookie Chain
Thinking
2025-04-15
7 min read
Research Dossier
#Vulnerability Analysis#Code Audit#Cyber Attack#Lateral Movement
WSUS treats the SimpleAuth plugin’s authentication Cookie as “verified trust”, but the chain that generates the Cookie has no strict deserialization protection — attackers use a 4-stage attack (obtain session ID, get auth Cookie, use Cookie to trigger SimpleAuth, inject malicious .NET deserialization payload) to gain RCE on the patch distribution center.
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