SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.
SERVER-WEBAPP Microsoft SharePoint attachment upload deserialization attempt
This rule looks for an upload which may be used to trigger a deserialization vulnerability.
What To Look For
This rule fires upon attempted upload of a malicious attachment to a Microsoft SharePoint server, which may be used to exploit CVE-2021-27076.
No public information
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Technique: Execution through API
For reference, see the MITRE ATT&CK vulnerability types here:
Insecure Deserialization relates to web application security. Applications turn an object into data through serialization; the reverse of that process, deserialization, can be vulnerable to attacks when the application trusts the data that is being deserialized. Serialized data is machine readable and not encrypted; serialized user-supplied data should not be trusted. Deserialization attacks can lead to remote code execution.
CVE Additional Information