CVE-2019-11289 in Cloud Foundry Routing
Summary
by MITRE
Cloud Foundry Routing, all versions before 0.193.0, does not properly validate nonce input. A remote unauthorized malicious user could forge a route service request using an invalid nonce that will cause the Gorouter to crash.
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Analysis
by VulDB Data Team • 02/23/2024
The Cloud Foundry Routing component vulnerability identified as CVE-2019-11289 represents a critical security flaw in the Gorouter implementation that affects all versions prior to 0.193.0. This vulnerability stems from inadequate validation of nonce parameters within route service requests, creating a pathway for unauthorized actors to exploit the system's authentication mechanisms. The issue specifically targets the routing layer that manages how requests are directed to appropriate applications within the Cloud Foundry ecosystem, making it a fundamental component of the platform's operational integrity.
The technical flaw manifests in the improper handling of nonce values that are supposed to prevent replay attacks and ensure request authenticity within the route service communication protocol. A nonce is a random or pseudo-random number used once in cryptographic communications to prevent unauthorized access or malicious manipulation of routing decisions. When the Gorouter fails to properly validate these nonce inputs, it allows attackers to submit forged route service requests containing invalid nonce values that can trigger unexpected behavior in the routing infrastructure. This validation failure creates a condition where the system processes malicious inputs without proper verification, leading to potential system instability and service disruption.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it can enable attackers to cause the Gorouter to crash entirely, disrupting the routing functionality for all applications managed by the Cloud Foundry platform. When the routing component becomes unstable or crashes, it affects the availability of applications that depend on proper route resolution, potentially causing widespread service interruptions for organizations relying on Cloud Foundry for their application deployment and management. The vulnerability is particularly concerning because it requires no authentication to exploit, making it accessible to any remote attacker with network access to the platform.
Organizations affected by this vulnerability should immediately implement mitigations including upgrading to version 0.193.0 or later, which contains the necessary validation fixes for nonce inputs. Additionally, network-level protections such as firewall rules and access controls can help limit exposure by restricting direct access to routing components. Security monitoring should be enhanced to detect unusual patterns in route service requests that might indicate exploitation attempts. The vulnerability aligns with CWE-284 Access Control Issues and maps to ATT&CK technique T1070.004 Indicator Removal on Host, as the compromised routing infrastructure could be used to hide malicious activities or disrupt legitimate operations. Regular security assessments of routing components and implementation of proper input validation mechanisms should become standard practices to prevent similar vulnerabilities from emerging in the future.