CVE-2015-6586 in AC6005
Summary
by MITRE
The mDNS module in Huawei WLAN AC6005, AC6605, and ACU2 devices with software before V200R006C00SPC100 allows remote attackers to obtain sensitive information by leveraging failure to restrict processing of mDNS unicast queries to the link local network.
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Analysis
by VulDB Data Team • 10/02/2020
The vulnerability identified as CVE-2015-6586 affects Huawei WLAN access controller devices including the AC6005, AC6605, and ACU2 models. This issue resides within the mDNS module and represents a significant security flaw that enables remote attackers to extract sensitive information from affected systems. The vulnerability stems from improper handling of mDNS unicast queries, specifically failing to enforce proper network boundary restrictions that should limit such queries to link-local network segments only. This design flaw creates an attack vector that bypasses fundamental network security principles and allows unauthorized information disclosure.
The technical implementation of this vulnerability demonstrates a failure in network protocol handling where the mDNS module does not adequately validate or restrict the scope of unicast query processing. According to CWE-200, this represents a weakness in information exposure where sensitive information is accessible to unauthorized actors. The flaw occurs because the system fails to properly isolate mDNS traffic to the local network segment, allowing remote attackers to send crafted unicast queries that can trigger information disclosure mechanisms within the device. This improper restriction of mDNS query processing creates a pathway for attackers to gather device-specific information that should remain confined to local network boundaries.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with potentially valuable data that could facilitate further exploitation attempts. Attackers can leverage this vulnerability to gather device configuration details, network topology information, and other sensitive metadata that could aid in crafting more sophisticated attacks. The remote nature of the exploit means that attackers do not require physical access or network proximity to the affected devices, making this vulnerability particularly dangerous in enterprise environments where such devices often serve as critical network infrastructure components. This weakness can contribute to broader attack surface expansion and may enable attackers to perform reconnaissance activities that would otherwise require more invasive techniques.
Mitigation strategies for CVE-2015-6586 should prioritize immediate firmware updates from Huawei to address the mDNS processing flaw. Network administrators should implement firewall rules to restrict mDNS traffic between network segments, ensuring that mDNS queries and responses are properly confined to local networks. According to ATT&CK framework tactic TA0007, this vulnerability could be exploited as part of a reconnaissance phase, making network segmentation and access control critical defensive measures. Additional protective measures include monitoring for unusual mDNS traffic patterns and implementing network access control policies that limit the scope of mDNS processing. Organizations should also conduct thorough network assessments to identify all affected devices and ensure that proper patch management procedures are in place to prevent similar vulnerabilities from being introduced through outdated firmware versions.