CVE-2016-6898 in E9000
Summary
by MITRE
XML external entity (XXE) vulnerability in the Hyper Management Module (HMM) in Huawei E9000 rack servers with software before V100R001C00SPC296 allows remote authenticated users to read arbitrary files or cause a denial of service (web service outage) via a crafted XML document.
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Analysis
by VulDB Data Team • 09/15/2022
The CVE-2016-6898 vulnerability represents a critical XML external entity processing flaw within Huawei E9000 rack servers' Hyper Management Module. This vulnerability resides in the server's management interface, specifically affecting systems running software versions prior to V100R001C00SPC296. The flaw enables remote authenticated attackers to exploit the XXE processing mechanism, creating a significant security risk for enterprise environments that rely on these high-performance computing platforms. The vulnerability's impact extends beyond simple data exfiltration to include potential service disruption through denial of service conditions.
The technical implementation of this vulnerability stems from improper handling of XML input within the Hyper Management Module's web service interface. When processing crafted XML documents, the system fails to properly validate or sanitize external entity references, allowing attackers to reference local files through external entity declarations. This flaw aligns with CWE-611, which categorizes improper restriction of XML external entity reference processing, and represents a classic XXE attack vector that has been documented across numerous enterprise systems. The vulnerability specifically affects the web service component that handles management requests, making it accessible to authenticated users who can leverage the module's legitimate administrative functions to execute malicious payloads.
Operational impact of this vulnerability manifests in two primary dimensions: unauthorized data access and service availability compromise. Remote authenticated attackers can exploit the XXE vulnerability to read arbitrary files from the server's local filesystem, potentially accessing sensitive configuration data, credentials, or system information. The attack vector requires only a valid authentication credential to the management interface, making it particularly dangerous in environments where administrative access is granted to multiple users. Additionally, the vulnerability can be leveraged to cause denial of service conditions by crafting XML documents that trigger resource exhaustion or application crashes, leading to complete web service outages that can disrupt critical business operations and require manual intervention to restore.
Organizations affected by CVE-2016-6898 should immediately implement mitigation strategies focusing on both immediate remediation and long-term security enhancements. The primary recommendation involves upgrading affected Huawei E9000 rack servers to software versions V100R001C00SPC296 or later, which contain patches addressing the XXE processing flaw. Network segmentation and access control measures should be implemented to limit administrative access to the Hyper Management Module, reducing the attack surface for authenticated users. Security monitoring should include detection of unusual XML processing patterns and malformed requests that may indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to technique T1059.007 for XML external entity processing and T1499.004 for network denial of service, making it a critical target for both preventive security controls and incident response procedures. The vulnerability also highlights the importance of proper input validation and secure coding practices in enterprise management interfaces, particularly those handling XML data processing.