POLICY-OTHER Microsoft SharePoint external ImportWeb attempt
Rule triggers if
- Traffic is destined for SharPoint's URI "/_vti_bin/sites.asmx"
- ImportWeb request is being made
- request is trying to import file ending with .cmp
What To Look For
This rule detects MS SharePoint's ImportWeb requests originating from external network and trying to import .cmp file. These requests can be used to trigger CVE-2020-17121.
No public information
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Tactic: Initial Access
Technique: Drive-by Compromise
For reference, see the MITRE ATT&CK vulnerability types here:
A Directory Traversal attack targets HTTP traffic and allows the attacker to access directories outside the applications own, potentially exposing sensitive system files to leakage or overwriting. This is also known as Directory Climbing, Path Traversal, or Backtracking. An alert on this kind of attack indicates a vulnerability in security validation of user input that allows a "traverse to parent directory" or "../" command to pass through. Protect your site by filtering all user input, removing any characters but the allowed data.
CVE Additional Information