Detect Soliton FileZen OS Command Injection Exploitation (CVE-2026-25108) in IBM QRadar
Detects exploitation of CVE-2026-25108, an OS command injection vulnerability (CWE-78) in Soliton Systems K.K FileZen file-sharing appliance. This vulnerability is listed on CISA's Known Exploited Vulnerabilities catalog and allows unauthenticated or authenticated attackers to inject arbitrary OS commands through vulnerable input fields, potentially leading to full system compromise.
MITRE ATT&CK
QRadar Detection Query
SELECT
sourceip,
destinationip,
URL,
"User-Agent" AS user_agent,
CATEGORYNAME(category) AS event_category,
logsourcename(logsourceid) AS log_source,
starttime,
username,
QIDNAME(qid) AS event_name,
magnitude
FROM events
WHERE
LOGSOURCETYPENAME(devicetype) IN ('Apache HTTP Server', 'Nginx', 'Microsoft IIS', 'F5 BIG-IP', 'Syslog')
AND (
(
(URL ILIKE '%/cgi-bin/%' OR URL ILIKE '%/admin/%' OR URL ILIKE '%/upload%' OR URL ILIKE '%/download%')
AND (
URL ILIKE '%;%' OR URL ILIKE '%|%' OR URL ILIKE '%`%'
OR URL ILIKE '%wget%' OR URL ILIKE '%curl%' OR URL ILIKE '%bash%'
OR URL ILIKE '%python%' OR URL ILIKE '%chmod%' OR URL ILIKE '%nc %'
OR URL ILIKE '%/etc/passwd%' OR URL ILIKE '%/bin/sh%'
)
)
OR "EventName" ILIKE '%CVE-2026-25108%'
OR "EventName" ILIKE '%FileZen%command injection%'
)
AND LAST 7 DAYS
ORDER BY magnitude DESC, starttime DESC
LIMIT 1000QRadar AQL query searching web access logs and network event sources for HTTP requests to FileZen appliance endpoints containing OS command injection metacharacters or known exploit payloads, correlated with event magnitude for prioritization.
Data Sources
Required Tables
False Positives & Tuning
- Internal security scanners running authorized vulnerability assessments that inject test payloads into web forms
- Legitimate administrative batch operations that pass command-line style arguments through web interfaces
- URL-encoded file names containing special characters that match injection patterns when decoded in log analysis
- Third-party integrations that construct URLs with encoded characters resembling shell metacharacters
Other platforms for CVE-2026-25108
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 1FileZen-style CGI Command Injection via HTTP GET parameter
Expected signal: Web server access log records GET request to /cgi-bin/upload.cgi with semicolon character in query string. Process audit log shows web server process (httpd/nginx) spawning /bin/sh or /bin/bash as child process executing 'id' command.
- Test 2Post-Exploitation Reverse Shell Download via Injected wget
Expected signal: Web server access log shows POST to /admin/config.cgi with pipe and wget in POST body. Network telemetry shows outbound TCP connection from web server host to ATTACKER_HOST:8080. File creation event for /tmp/payload.sh. Process execution of wget and chmod as children of web server process.
- Test 3Credential and Configuration Exfiltration via Piped cat Command
Expected signal: Web server log records GET request to /download endpoint with URL-encoded pipe and cat command sequence. Network telemetry shows outbound POST connection from FileZen host to ATTACKER_HOST:9090. Process audit captures cat /etc/passwd executed as child of web server process, followed by curl data exfiltration subprocess.
- Test 4Webshell Implantation via Command Injection for Persistent Access
Expected signal: Web server access log records POST to CGI endpoint with semicolon and echo command in body. File creation event for /var/www/html/status.php with PHP content. Process tree shows web server spawning sh executing echo redirection. Subsequent access to /var/www/html/status.php with cmd parameter would indicate webshell usage.
Unlock Pro Content
Get the full detection package for CVE-2026-25108 including response playbook, investigation guide, and atomic red team tests.