CVE-2015-7847 in E3272s
Summary
by MITRE
Huawei MBB (Mobile Broadband) product E3272s with software versions earlier than E3272s-153TCPU-V200R002B491D09SP00C00 has a Denial of Service (DoS) vulnerability. An attacker could send a malicious packet to the Common Gateway Interface (CGI) of a target device and make it fail while setting the port attribute, which causes a DoS attack.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/24/2020
The CVE-2015-7847 vulnerability affects Huawei MBB E3272s devices running firmware versions prior to E3272s-153TCPU-V200R002B491D09SP00C00, representing a critical denial of service flaw within mobile broadband communication infrastructure. This vulnerability specifically targets the Common Gateway Interface implementation of the device's web management interface, creating a pathway for remote attackers to disrupt service availability. The flaw manifests when malicious packets are transmitted to the CGI component, causing the device to fail during port attribute configuration processes, ultimately leading to complete service interruption.
The technical exploitation of this vulnerability stems from insufficient input validation within the CGI interface's port attribute handling mechanism. According to CWE classification, this represents a weakness in input validation where malformed or specially crafted packets can trigger unexpected behavior in the device's processing logic. The vulnerability falls under the category of improper input validation and can be mapped to ATT&CK technique T1499.004 for network denial of service attacks. When an attacker sends a malicious packet to the CGI endpoint, the device's processing routine fails to properly handle the malformed port attribute data, resulting in a system crash or reboot cycle that renders the device inoperable.
The operational impact of CVE-2015-7847 extends beyond simple service disruption, as it affects the reliability and availability of mobile broadband connections for end users. In enterprise environments where these devices serve as primary internet connectivity solutions, a successful DoS attack can result in significant business interruption and productivity loss. The vulnerability particularly affects organizations relying on Huawei E3272s devices for remote connectivity, as attackers can remotely compromise device functionality without requiring physical access or authentication credentials. Network administrators may experience difficulties in maintaining service availability, as the device's failure to properly handle port configuration requests creates an unpredictable service degradation scenario.
Mitigation strategies for this vulnerability should focus on immediate firmware updates to versions E3272s-153TCPU-V200R002B491D09SP00C00 or later, which contain patched implementations of the CGI interface with proper input validation mechanisms. Network segmentation and access control measures can provide additional protection by limiting direct exposure of affected devices to untrusted networks. Security monitoring should include detection of anomalous traffic patterns targeting the CGI interface, particularly around port configuration requests. Organizations should also implement network intrusion detection systems capable of identifying and blocking malicious packet sequences that match the vulnerability's exploitation patterns. The remediation process must include thorough testing of updated firmware in controlled environments before deployment to ensure that the patch does not introduce compatibility issues with existing network configurations.