🛡️ Google GCE Network allows unrestricted CiscoSecure/WebSM traffic🟢
- Contextual name: 🛡️ GCE Network allows unrestricted CiscoSecure/WebSM traffic🟢
- ID:
/ce/ca/google/vpc/network-ciscosecure-websm-access - Tags:
- Policy Type:
COMPLIANCE_POLICY - Policy Categories:
SECURITY
Logic
Description
Description
This policy identifies Google GCE Networks that have Firewall Rules allowing unrestricted incoming traffic (
0.0.0.0/0) from the internet to ports commonly used by CiscoSecure WebSM (TCP port 9090).In GCP, Firewall Rules are defined at the VPC Network level. Each rule either allows or denies traffic based on its configuration. These configurations specify the type of traffic (e.g., protocols and ports) and the source or destination (e.g., IP addresses, subnets, and instances).
Rationale
Exposing management interfaces such as WebSM to the public internet creates a significant security risk. These ports should only be accessible from trusted, internal network locations. Allowing unrestricted public access makes these services vulnerable to scanning, brute-force login attempts, and exploitation of potential vulnerabilities, which could lead to unauthorized access and compromise of network devices or infrastructure.
Impact
All external connections to WebSM from outside the affected VPC(s) can be blocked. If there is a legitimate business requirement for remote access (for example, administrative access to Cassandra resources), specific trusted source IP addresses should be explicitly defined in firewall rules to whitelist access to the required ports.
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Remediation
Remediation
From Google Cloud Console
- Go to
VPC Network.- Go to the
Firewall Rules.- Click the
Firewall Ruleto be modified.- Click
Edit.- Modify
Source IP rangesto specificIP.- Click
Save.From Google Cloud CLI
Identify Firewall Rules Allowing Public Access
gcloud compute networks get-effective-firewalls default \
--format="table(NAME, DIRECTION, IP_RANGES)" \
--filter="IP_RANGES:0.0.0.0/0 AND DIRECTION:INGRESS"Restrict the Source Range
Once you have identified the firewall rules, update each one to restrict access to trusted CIDR ranges:
gcloud compute firewall-rules update {{firewall-rule-name}} \
--source-ranges={{cidr-range1}},{{cidr-range2}}