CVE-2016-6181 in Honor 4C
Summary
by MITRE
The Camera driver in Huawei Honor 4C smartphones with software CHM-UL00C00 before CHM-UL00C00B564, CHM-TL00C01 before CHM-TL00C01B564, and CHM-TL00C00 before CHM-TL00HC00B564 allows attackers to cause a denial of service (system crash) or gain privileges via a crafted application, a different vulnerability than CVE-2016-6180, CVE-2016-6182, CVE-2016-6183, and CVE-2016-6184.
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Analysis
by VulDB Data Team • 09/15/2022
The vulnerability identified as CVE-2016-6181 represents a critical security flaw within the camera driver component of Huawei Honor 4C smartphones, specifically affecting devices running software versions prior to designated patches. This vulnerability resides in the kernel-level driver responsible for managing camera functionality, making it particularly dangerous as it operates at a low system level with elevated privileges. The affected devices include multiple variants of the Honor 4C across different regional configurations, highlighting the widespread nature of this issue. The vulnerability allows malicious actors to exploit the camera driver through specially crafted applications that can trigger either system crashes or unauthorized privilege escalation, creating a significant attack surface for potential adversaries.
The technical implementation of this vulnerability stems from improper input validation and memory management within the camera driver module. Attackers can construct malicious applications that manipulate the driver's handling of camera-related system calls, leading to buffer overflows, null pointer dereferences, or other memory corruption issues. When the vulnerable driver processes these crafted inputs, it fails to properly validate the data integrity, resulting in unpredictable behavior that can manifest as system crashes or privilege escalation. The flaw specifically affects the kernel-level driver execution context, where the camera subsystem operates with high privileges, enabling attackers to potentially elevate their privileges from standard application level to system level. This type of vulnerability aligns with CWE-121, which describes stack-based buffer overflow conditions, and CWE-122, which covers heap-based buffer overflow scenarios.
The operational impact of CVE-2016-6181 extends beyond simple denial of service conditions to include potential full system compromise. When exploited, the vulnerability can cause spontaneous system reboots or crashes that disrupt user experience and potentially lead to data loss. More critically, the privilege escalation aspect allows attackers to gain root access to the device, enabling them to modify system files, install malicious applications, access sensitive user data, and potentially establish persistent backdoors. This vulnerability particularly affects mobile devices where users expect robust security and privacy protections, making it a significant concern for both individual users and enterprise environments. The impact is amplified by the fact that these devices were widely deployed in various markets, increasing the potential attack surface and the number of vulnerable targets.
Mitigation strategies for CVE-2016-6181 primarily focus on applying official firmware updates from Huawei that contain patched versions of the camera driver. Users should immediately check for and install available security updates for their Honor 4C devices, particularly those addressing the specific software versions mentioned in the vulnerability description. Network administrators and security professionals should implement device monitoring to identify potentially vulnerable devices within their networks and prioritize patching efforts. Additionally, implementing application whitelisting policies can help prevent the execution of malicious applications that might exploit this vulnerability. From a threat intelligence perspective, this vulnerability demonstrates the importance of mobile security assessments and continuous monitoring of device firmware for known vulnerabilities. Organizations should consider the ATT&CK framework's mobile threat models, particularly the techniques related to privilege escalation and persistence, when developing their security response strategies for such vulnerabilities. The vulnerability also underscores the necessity of secure coding practices in mobile device drivers and the importance of thorough security testing before device deployment.