CVE-2025-2838 in Gecko OS
Summary
by MITRE • 03/27/2025
Silicon Labs Gecko OS DNS Response Processing Infinite Loop Denial-of-Service Vulnerability. This vulnerability allows network-adjacent attackers to create a denial-of-service condition on affected installations of Silicon Labs Gecko OS. Authentication is not required to exploit this vulnerability.
The specific flaw exists within the processing of DNS responses. The issue results from a logic error that can lead to an infinite loop. An attacker can leverage this vulnerability to create a denial-of-service condition on the system. Was ZDI-CAN-23392.
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Analysis
by VulDB Data Team • 03/27/2025
The vulnerability identified as CVE-2025-2838 represents a critical denial-of-service weakness within Silicon Labs Gecko OS firmware implementations. This flaw specifically targets the DNS response processing functionality of the operating system, creating a condition where legitimate network operations can be disrupted through carefully crafted malicious inputs. The vulnerability's classification as a remote attack vector means that adversaries can exploit this weakness without requiring physical access or prior authentication credentials, making it particularly dangerous in networked environments where multiple devices may be affected. The issue stems from a fundamental logic error in how the system handles certain DNS response structures, which can cause the processing loop to become trapped in an infinite cycle.
The technical implementation of this vulnerability manifests in the DNS response handling mechanism of Gecko OS where specific malformed or crafted DNS responses trigger an infinite loop during processing. When the operating system receives a DNS response that contains particular field values or structures, the internal logic fails to properly terminate the processing loop, resulting in continuous execution of the same code path. This behavior fundamentally violates the expected operational flow of the DNS resolver component and causes system resources to become consumed indefinitely. The vulnerability's impact extends beyond simple resource exhaustion as it can cause the entire DNS resolution process to become unresponsive, effectively preventing the device from performing any network communication that relies on DNS resolution. This processing error falls under CWE-835, which specifically addresses infinite loops in software implementations, and demonstrates how improper termination conditions in control flow logic can lead to complete system unavailability.
The operational implications of this vulnerability are significant for any network infrastructure that relies on Silicon Labs Gecko OS devices, including IoT sensors, embedded systems, network appliances, and various wireless communication devices. Attackers can exploit this weakness to render affected systems completely non-functional, creating cascading failures in network operations where dependent devices may also become unavailable due to the inability to resolve network addresses. The lack of authentication requirements for exploitation means that this vulnerability can be leveraged by any network-adjacent attacker, including those who may be monitoring network traffic or positioned within the same broadcast domain. This makes the vulnerability particularly concerning for industrial control systems, smart grid infrastructure, and other critical network environments where unauthorized access could lead to substantial operational disruptions. The ATT&CK framework categorizes this type of vulnerability under T1499.004, which covers network denial of service attacks, and the technique can be used as part of broader attack campaigns targeting network availability and operational continuity.
Mitigation strategies for CVE-2025-2838 should focus on immediate firmware updates from Silicon Labs to address the root cause of the infinite loop condition. Organizations should implement network segmentation and access controls to limit the potential attack surface, particularly in environments where untrusted network traffic may reach affected devices. Network monitoring solutions should be configured to detect unusual DNS processing patterns that may indicate exploitation attempts, and system administrators should establish regular vulnerability assessments to identify any potentially impacted devices within their network infrastructure. Additional defensive measures include implementing DNS response validation mechanisms that can detect and filter out malformed responses before they reach the vulnerable processing components, and establishing network intrusion detection systems that can identify suspicious DNS traffic patterns associated with this specific vulnerability. The remediation process should also include thorough testing of firmware updates in controlled environments before deployment to ensure that the patch does not introduce any compatibility issues with existing network operations or device functionality.