ET EXPLOIT Possible Microsoft Exchange RCE with Python PSRP Client UA Inbound (CVE-2021-34473)

SID: 2033712Rev: 11 viewsHistory

Sourceet/open

CreatedAugust 12, 2021

UpdatedDecember 23, 2022

Classificationattempted-admin

alert http any any -> [$HOME_NET,$HTTP_SERVERS] [443,444] (msg:"ET EXPLOIT Possible Microsoft Exchange RCE with Python PSRP Client UA Inbound (CVE-2021-34473)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/autodiscover/autodiscover.json?"; http.user_agent; content:"Python|20|PSRP|20|Client"; fast_pattern; reference:cve,2021-34473; classtype:attempted-admin; sid:2033712; rev:1; metadata:affected_product Microsoft_Exchange, attack_target Server, created_at 2021_08_12, cve CVE_2021_34473, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_12_23, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)

References

cve	2021-34473

Metadata

affected productMicrosoft_Exchange

attack targetServer

created at2021_08_12

cveCVE-2021-34473

deploymentInternal

confidenceMedium

signature severityMajor

tagCISA_KEV

updated at2022_12_23

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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