CVE-2022-1561 in Lura
Summary
by MITRE • 08/01/2022
Lura and KrakenD-CE versions older than v2.0.2 and KrakenD-EE versions older than v2.0.0 do not sanitize URL parameters correctly, allowing a malicious user to alter the backend URL defined for a pipe when remote users send crafty URL requests. The vulnerability does not affect KrakenD itself, but the consumed backend might be vulnerable.
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Analysis
by VulDB Data Team • 08/01/2022
This vulnerability represents a critical parameter injection flaw in Lura and KrakenD API gateway implementations that stems from inadequate input sanitization mechanisms. The issue affects versions prior to v2.0.2 for Lura and KrakenD-CE, and v2.0.0 for KrakenD-EE, creating a pathway for malicious actors to manipulate backend service endpoints through carefully crafted URL requests. The flaw manifests when the system fails to properly validate and sanitize user-supplied URL parameters, allowing attackers to inject or modify backend URLs that are subsequently processed by the gateway.
The technical execution of this vulnerability leverages the lack of proper parameter validation within the URL processing pipeline, which aligns with CWE-20 - Improper Input Validation and CWE-94 - Improper Control of Generation of Code. Attackers can construct malicious requests that exploit the insufficient sanitization to redirect traffic to unintended backend services, potentially enabling them to access internal systems, bypass authentication mechanisms, or target vulnerable backend components that may not be directly exposed to the public internet. This type of vulnerability falls under the ATT&CK technique T1071.004 - Application Layer Protocol: DNS, as it manipulates URL parameters to influence application behavior and data flow.
The operational impact of this vulnerability extends beyond simple redirection attacks, as it creates opportunities for attackers to exploit downstream backend services that may have their own vulnerabilities. Even though the KrakenD gateway itself remains unaffected, the compromised backend endpoints become vulnerable to exploitation, potentially leading to data breaches, service disruption, or further lateral movement within the network infrastructure. The vulnerability essentially creates a man-in-the-middle scenario where attackers can manipulate the intended destination of API requests, potentially accessing sensitive data or services that should remain isolated from external access.
Organizations should implement immediate mitigations including upgrading to the patched versions mentioned in the advisory, implementing robust input validation at all entry points, and deploying comprehensive monitoring solutions to detect anomalous URL parameter patterns. Additionally, network segmentation and access controls should be strengthened to limit potential damage from successful exploitation attempts. The vulnerability highlights the critical importance of input sanitization in API gateway implementations and serves as a reminder of the need for comprehensive security testing throughout the software development lifecycle.