CVE-2021-0676 in MT6762
Summary
by MITRE • 12/17/2021
In geniezone driver, there is a possible out of bounds read due to an incorrect bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS05863009; Issue ID: ALPS05863009.
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Analysis
by VulDB Data Team • 12/24/2021
The vulnerability identified as CVE-2021-0676 resides within the geniezone driver component of a system, representing a critical out-of-bounds read condition that stems from inadequate bounds checking mechanisms. This flaw manifests in the driver's inability to properly validate input parameters before processing them, creating a scenario where memory access occurs beyond the allocated buffer boundaries. The vulnerability specifically affects systems utilizing the geniezone driver and represents a significant security risk due to its potential for information disclosure.
The technical implementation of this vulnerability demonstrates a classic buffer over-read scenario where the driver fails to properly validate the size or range of data being processed. When the geniezone driver receives input data, it performs bounds checking that is insufficient or incorrectly implemented, allowing an attacker to manipulate input parameters to cause the driver to read memory locations beyond the intended buffer limits. This incorrect bounds check creates a predictable pattern where the driver's memory access operations can traverse into adjacent memory regions, potentially exposing sensitive data structures, kernel memory contents, or other confidential information.
The operational impact of this vulnerability extends beyond simple information disclosure, as it requires system execution privileges for exploitation but does not necessitate user interaction, making it particularly dangerous in environments where privilege escalation opportunities exist. The vulnerability's classification as a local information disclosure means that an attacker with system-level access can leverage this flaw to extract sensitive information from the kernel memory space or other protected system components. This type of vulnerability aligns with CWE-129, which specifically addresses improper bounds checking, and represents a direct threat to system integrity and confidentiality. The attack vector does not require user interaction, which means the vulnerability can be exploited automatically once an attacker has achieved system-level privileges.
Security implications of CVE-2021-0676 extend to potential exploitation scenarios where attackers could use the information disclosure to gather system configuration details, memory layouts, or other sensitive data that could aid in further attacks. The vulnerability's design flaw creates a persistent risk that remains active until properly patched, and its exploitation requires minimal user interaction beyond achieving the necessary system privileges. The patch ID ALPS05863009 indicates that this vulnerability was addressed through a specific firmware or driver update that corrects the bounds checking implementation. Organizations should prioritize applying this patch to prevent potential exploitation, particularly in environments where the geniezone driver is actively used. The vulnerability's presence in the driver layer also raises concerns about potential chain reactions where information disclosure could lead to privilege escalation or other advanced attack vectors, making it essential for system administrators to monitor and remediate this issue promptly. This type of vulnerability commonly maps to ATT&CK technique T1003.001 for credential dumping and T1059.001 for command and script interpreter, as the information disclosure could provide attackers with the data needed to perform more sophisticated attacks within the compromised system environment.