ET WEB_SERVER Microsoft Windows Server Update Services (WSUS) Elevation of Privilege via Insecure Deserialization (CVE-2023-35317)
Sourceet/open
CreatedOctober 27, 2025
UpdatedOctober 27, 2025
Classificationweb-application-attack
alert http any any -> $HOME_NET any (msg:"ET WEB_SERVER Microsoft Windows Server Update Services (WSUS) Elevation of Privilege via Insecure Deserialization (CVE-2023-35317)"; flow:established,to_server; http.uri; content:"/ClientWebService/Client.asmx"; fast_pattern; startswith; http.header; content:"ClientWebService/GetCookie"; http.request_body; content:"SimpleTargeting"; content:"CookieData"; http.method; content:"POST"; reference:url,hawktrace.com/blog/CVE-2025-59287; reference:cve,2023-35317; classtype:web-application-attack; sid:2065402; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2025_10_27, cve CVE_2023_35317, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)
References
Metadata
attack targetServer
tls stateTLSDecrypt
created at2025_10_27
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_10_27
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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