CVE-2017-17538 in MikroTik
Summary
by MITRE
MikroTik v6.40.5 devices allow remote attackers to cause a denial of service via a flood of ICMP packets.
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Analysis
by VulDB Data Team • 07/14/2024
The vulnerability identified as CVE-2017-17538 affects MikroTik routers running firmware version 6.40.5 and potentially other versions within the same release cycle. This issue represents a denial of service weakness that can be exploited remotely through the manipulation of Internet Control Message Protocol traffic. The flaw specifically manifests when the device receives an excessive volume of ICMP packets, leading to system resource exhaustion and subsequent service disruption. MikroTik devices are widely deployed in enterprise and residential networking environments, making this vulnerability particularly concerning from a cybersecurity perspective as it can impact critical network infrastructure. The vulnerability falls under the category of resource exhaustion attacks where malicious actors can overwhelm the device's processing capabilities through crafted network traffic.
The technical implementation of this vulnerability stems from inadequate input validation and packet processing mechanisms within the MikroTik firmware's ICMP handling routines. When the device receives a flood of ICMP packets, the system fails to properly rate-limit or filter incoming traffic, allowing the malicious packets to consume available memory and processing resources. This behavior creates a condition where legitimate network traffic becomes degraded or completely blocked as the device becomes overwhelmed with processing ICMP requests. The flaw demonstrates poor defensive programming practices and highlights the importance of implementing proper traffic shaping and rate-limiting mechanisms at network infrastructure level. From a cybersecurity perspective, this vulnerability represents a classic example of a resource exhaustion attack pattern that can be executed with minimal technical expertise.
The operational impact of CVE-2017-17538 extends beyond simple service disruption to potentially compromise network availability and business continuity for organizations relying on affected MikroTik devices. When exploited, the vulnerability can render network infrastructure unusable for extended periods, affecting everything from internal communications to external connectivity for connected devices. Organizations may experience cascading failures as dependent systems lose network access, potentially leading to significant financial losses and operational downtime. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the internet without requiring physical access or local network credentials, making it particularly dangerous for perimeter security. This vulnerability also demonstrates the risk of relying on default configurations in network infrastructure devices that may not adequately protect against common attack vectors.
Mitigation strategies for CVE-2017-17538 should focus on implementing network-level protections and firmware updates to address the root cause. Organizations should immediately apply the latest firmware updates provided by MikroTik to resolve the vulnerability, as the vendor released patches specifically addressing this issue. Network administrators should also implement rate-limiting rules on ICMP traffic at network boundaries and firewall configurations to prevent excessive packet flooding from reaching affected devices. The implementation of intrusion prevention systems and network monitoring tools can help detect anomalous ICMP traffic patterns that may indicate exploitation attempts. From a defensive standpoint, this vulnerability aligns with ATT&CK technique T1499.001 which covers network disruption attacks and CWE-400 which addresses unchecked resource consumption. Organizations should also consider implementing network segmentation and access control measures to limit the potential impact of such attacks and reduce the attack surface for similar vulnerabilities.