Microsoft Vulnerability CVE-2021-26855: A coding deficiency exists in Microsoft Exchange Server that may lead to remote code execution.
Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 57241 through 57244.
Microsoft Vulnerability CVE-2021-26857: A coding deficiency exists in Microsoft Exchange Server that may lead to remote code execution.
Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 57233 through 57234.
Microsoft Vulnerability CVE-2021-26858: A coding deficiency exists in Microsoft Exchange Server that may lead to remote code execution.
Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 57245 through 57246.
Microsoft Vulnerability CVE-2021-27065: A coding deficiency exists in Microsoft Exchange Server that may lead to remote code execution.
Rules to detect attacks targeting these vulnerabilities are included in this release and are identified with GID 1, SIDs 57245 through 57246.
Talos also has added and modified multiple rules in the malware-cnc, netbios and server-webapp rule sets to provide coverage for emerging threats from these technologies.
For information about Snort Subscriber Rulesets available for purchase, please visit the Snort product page.
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091700.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091601.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091600.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091501.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091500.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091401.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091300.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2091101.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 3000.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (snort3-server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (snort3-server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (snort3-server-other.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (snort3-server-webapp.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (snort3-server-other.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (snort3-server-webapp.rules) * 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (snort3-server-webapp.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (snort3-malware-cnc.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (snort3-server-webapp.rules)
This is the complete list of rules modified and added in the Sourcefire VRT Certified rule pack for Snort version 2983.
The format of the file is:
gid:sid <-> Default rule state <-> Message (rule group)
* 1:57244 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57245 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57233 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57234 <-> ENABLED <-> SERVER-OTHER Microsoft Exchange Server Unified Messaging arbitrary code execution attempt (server-other.rules) * 1:57235 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57236 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57237 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57238 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57239 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57240 <-> ENABLED <-> MALWARE-CNC Html.Webshell.Hafnium inbound request attempt (malware-cnc.rules) * 1:57241 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57242 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 1:57246 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server arbitrary file write attempt (server-webapp.rules) * 1:57243 <-> ENABLED <-> SERVER-WEBAPP Microsoft Exchange Server server side request forgery attempt (server-webapp.rules) * 3:57232 <-> ENABLED <-> NETBIOS TRUFFLEHUNTER TALOS-2021-1258 attack attempt (netbios.rules)
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