Introduction

2025’s biggest exploits—CVE-2025-7775 (Citrix NetScaler) and CVE-2025-48384 (Git clone RCE)—are being actively used by attackers and added to CISA’s KEV list. Security teams now need more than patch alerts: they need hands-on, actionable detection and defense to stay ahead. This post fills a common gap with unique SIEM rules, IDS signatures, and cloud-WAF examples for world-class protection.

CVE-2025-7775 Citrix NetScaler: Indicators and SIEM Rules

• Exploit: Memory overflow bug enables remote code execution or denial-of-service on exposed ADC/Gateway devices.

• Key Indicator: Unexpected inbound requests (pre-auth) targeting /vpn, /rdpproxy, or ICA/SSL endpoints—especially with abnormal payloads or IPv6 services.thehackernews+2

SIEM Rule (Elastic/Splunk Logic):

text
Detect suspicious pre-auth POST/GETs:
index=network_logs sourcetype=firewall OR sourcetype=waf 
(uri="/vpn" OR uri="/rdpproxy" OR uri="/cvpn" OR uri="/ica")
AND (bytes_in>10000 OR unusual_headers="true")
| stats count by src_ip uri bytes_in
| where count > 3

Cloud-WAF Block Rule (example):

• Block POST requests to /vpn, /cvpn, /ica, /rdpproxy with uncommon headers or oversized bodies.

• Monitor for spikes in error 500/502s post-patch.

Snort/Suricata Signature:

text
alert tcp $EXTERNAL_NET any -> $HOME_NET [443,80] (msg:"NetScaler Exploit Attempt CVE-2025-7775"; uricontent:"/vpn"; flow:to_server,established; content:"POST"; distance:0; nocase; threshold:type both, track by_src, count 3, seconds 30; sid:20257775;)

CVE-2025-48384 Git RCE: Indicators and SIEM/IDS Rules

• Exploit: Malicious .gitmodules or config during git clone causes RCE on dev machines—mass supply chain risk.

• Key Indicator: Inbound or internal traffic with uploads containing .gitmodules, or cloning public repos with suspicious content.

SIEM Rule Example:

text
index=network_logs sourcetype=proxy OR sourcetype=endpoint
(uri=".gitmodules" OR file_name=".gitmodules")
AND action="download"

Snort/Suricata Signature:

text
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"Possible Git RCE Exploit CVE-2025-48384"; content:".gitmodules"; depth:150; nocase; sid:202548384;)

Cloud Security (CASB/WAF):

• Block or alert on public repository URLs containing .gitmodules or suspicious config file patterns in uploads.

• Flag outbound dev traffic to new or unknown Git sources.

Key Steps for Security Teams

1. Patch quickly: Still the best and most reliable mitigation.

2. Deploy above rules to SOC/blue team tools.

3. Check cloud WAF, endpoint EDR, and proxy logs for signs of scanning or exploit attempts.

4. Proactively educate dev, IT, and ops teams about RCE and supply chain risk.

5. Hunt for retroactive indicators of compromise post-July 2025.