CVE-2022-0675 in Firewall Module
Summary
by MITRE • 03/03/2022
In certain situations it is possible for an unmanaged rule to exist on the target system that has the same comment as the rule specified in the manifest. This could allow for unmanaged rules to exist on the target system and leave the system in an unsafe state.
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Analysis
by VulDB Data Team • 03/04/2022
This vulnerability exists within configuration management systems where rule enforcement mechanisms fail to properly validate the uniqueness of rule identifiers, particularly when comments serve as primary distinguishing factors. The flaw allows for the coexistence of managed rules defined in configuration manifests alongside unmanaged rules that share identical comments, creating a scenario where system administrators cannot reliably determine which rules are actively managed and enforced. This condition represents a configuration drift vulnerability that undermines the integrity of automated security controls.
The technical implementation of this vulnerability stems from inadequate validation logic within rule processing engines that rely on comment fields as unique identifiers rather than implementing robust rule fingerprinting mechanisms. When a system processes configuration manifests, it fails to perform comprehensive checks that would detect existing rules with matching comments, allowing duplicate or conflicting rule definitions to persist in the target environment. This weakness aligns with CWE-1107, which addresses improper validation of rule uniqueness in automated configuration systems, and can be categorized under ATT&CK technique T1562.001 for privilege escalation through configuration modification.
The operational impact of this vulnerability extends beyond simple configuration inconsistencies, potentially creating security gaps where unmanaged rules could provide unintended access paths or bypass security controls. Attackers could exploit this weakness by creating malicious unmanaged rules that mirror legitimate rule comments, thereby establishing persistent backdoors or shadow access mechanisms that remain undetected by standard security monitoring. The vulnerability essentially creates a false sense of security where systems appear to be properly configured while simultaneously harboring unauthorized rule definitions.
Mitigation strategies must address both immediate remediation and long-term architectural improvements to rule management systems. Organizations should implement comprehensive rule validation that includes unique identifier generation based on multiple factors rather than relying solely on comment fields, and establish regular audit procedures to identify and remove duplicate or conflicting rules. The solution should incorporate automated scanning mechanisms that detect rule comment collisions and maintain detailed rule provenance tracking to ensure complete visibility of all active rules. Additionally, implementing least privilege principles for rule modification and establishing mandatory review processes for rule changes can significantly reduce the risk of exploitation.