CVE-2025-29972
📋 TL;DR
This CVE describes a Server-Side Request Forgery (SSRF) vulnerability in Azure services that allows an authorized attacker to make the server send requests to internal or external systems, potentially leading to data exposure or further attacks. It affects Azure services configured with vulnerable components and requires attacker authentication. Organizations using affected Azure services are at risk.
💻 Affected Systems
- Azure services with SSRF-vulnerable components
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attacker gains access to internal Azure resources, exfiltrates sensitive data, or moves laterally within the cloud environment to compromise critical systems.
Likely Case
Attacker accesses metadata services, internal APIs, or storage accounts to gather information for further attacks or data theft.
If Mitigated
Limited to information disclosure about internal network structure with no critical data exposure.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check Microsoft Security Update Guide for specific service updates
Vendor Advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-29972
Restart Required: No
Instructions:
1. Review the Microsoft Security Update Guide. 2. Apply Azure service updates through the Azure portal or management tools. 3. Verify updates are deployed across all affected services.
🔧 Temporary Workarounds
Network Security Group (NSG) Restrictions
allRestrict outbound traffic from Azure services to only necessary endpoints
az network nsg rule create --resource-group <RG> --nsg-name <NSG> --name DenySSRF --priority 100 --direction Outbound --access Deny --destination-address-prefixes * --destination-port-ranges * --protocol *
Azure Firewall/Web Application Firewall (WAF) Rules
allBlock requests to internal IP ranges and metadata services
Add WAF custom rule to block requests to 169.254.169.254 (Azure metadata) and internal IP ranges
🧯 If You Can't Patch
- Implement strict network segmentation and outbound traffic filtering
- Monitor and alert on unusual outbound requests from Azure services
🔍 How to Verify
Check if Vulnerable:
Review Azure service configurations and check for unpatched components via Azure Security Center or similar toolsCheck Version:
az version (for CLI) or check service versions in Azure portalVerify Fix Applied:
Confirm Azure services are updated to latest versions and test SSRF attempts are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual outbound HTTP requests from Azure services to internal IPs
- Requests to metadata service (169.254.169.254) from unexpected sources
Network Indicators:
- Outbound traffic from Azure services to non-standard destinations
- HTTP requests with internal IP addresses in parameters
SIEM Query:
source="azure-logs" AND (url CONTAINS "169.254.169.254" OR url CONTAINS "internal")