Detect CVE-2025-64446: Fortinet FortiWeb Path Traversal Exploitation in Sumo Logic CSE
Detects exploitation attempts targeting CVE-2025-64446, a path traversal vulnerability (CWE-23) in Fortinet FortiWeb. This vulnerability allows attackers to traverse directory boundaries and access files outside the intended web root, potentially exposing sensitive configuration files, credentials, or system files. The vulnerability is listed in CISA KEV indicating active exploitation in the wild.
MITRE ATT&CK
Sumo Detection Query
_sourceCategory=fortinet/fortiWeb OR _sourceCategory=network/fortiWeb
| parse field=_raw "url=*" as url nodrop
| parse field=_raw "request_url=*" as request_url nodrop
| parse field=_raw "uri=*" as uri nodrop
| eval url = lower(coalesce(url, request_url, uri, ""))
| where url matches "*../*" or url matches "*..\\*" or url matches "*%2e%2e%2f*" or url matches "*..%2f*" or url matches "*%2e%2e%5c*" or url matches "*%252e%252e*" or url matches "*etc/passwd*" or url matches "*etc/shadow*" or url matches "*web.config*" or url matches "*proc/self*" or url matches "*..../*"
| parse field=_raw "srcip=*" as src_ip nodrop
| parse field=_raw "dstip=*" as dst_ip nodrop
| count by src_ip, url, _sourceCategory
| where _count >= 1
| sort by _count descSumo Logic query for Fortinet FortiWeb path traversal detection. Parses URL fields from raw FortiWeb log entries and identifies traversal patterns including percent-encoded variants, aggregating by source IP to highlight repeated attempts.
Data Sources
Required Tables
False Positives & Tuning
- Legitimate security scanning tools authorized to test web applications behind FortiWeb
- Log parsing artifacts from non-standard FortiWeb log formats creating false URL matches
- CDN or proxy services that modify URLs before FortiWeb inspection creating apparent traversal sequences
- FortiWeb management interface access using paths that resemble traversal patterns
Other platforms for CVE-2025-64446
Testing Methodology
Validate this detection against 4 adversary techniques from Atomic Red Team. Each test below lists the behaviour to exercise and the telemetry you should expect to see. Executable commands and cleanup steps are available with Pro.
- Test 1Basic Path Traversal Against FortiWeb-Protected Endpoint
Expected signal: FortiWeb access log entry with the traversal URL, source IP, HTTP method GET, and either a 403 block response (if WAF in block mode) or 200/redirect if in monitor mode. SIEM should receive a CommonSecurityLog or syslog event within 60 seconds.
- Test 2URL-Encoded Path Traversal (Double Encoding)
Expected signal: Multiple FortiWeb log entries with percent-encoded URL paths. SIEM events should show the encoded traversal sequences in RequestURL or Message fields. Attack log should show WAF signature matches for each encoded variant.
- Test 3Traversal Targeting FortiWeb Configuration or Certificate Files
Expected signal: FortiWeb access and attack logs showing four separate requests targeting sensitive paths. Response codes expected to be 403 if blocking mode is active. SIEM should receive all four events and score the requests with TargetsSensitiveFile=true, raising FinalScore to critical threshold.
- Test 4Automated Traversal Fuzzing Simulation
Expected signal: Burst of 8 FortiWeb log events from the same source IP within 10 seconds, each containing traversal patterns. SIEM correlation rules should group these by source IP and escalate based on repeat attempts.
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