CVE-2020-36601 in EMUI
Summary
by MITRE • 09/16/2022
Out-of-bounds write vulnerability in the kernel modules. Successful exploitation of this vulnerability may cause a panic reboot.
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Analysis
by VulDB Data Team • 10/20/2022
This vulnerability represents a critical out-of-bounds write condition within kernel modules that can lead to system instability and potential denial of service. The flaw occurs when kernel code fails to properly validate array indices or buffer boundaries before writing data, creating an opportunity for unauthorized memory corruption. Such vulnerabilities are particularly dangerous because they operate at the kernel level where privilege escalation is not required for exploitation, making them attractive targets for attackers seeking to compromise system integrity. The out-of-bounds write condition typically arises from insufficient input validation or improper handling of user-supplied data within kernel-space operations.
The technical implementation of this vulnerability involves kernel modules that process data without adequate boundary checks, allowing malicious input to overwrite adjacent memory locations. When the kernel attempts to write data beyond the allocated buffer or array boundaries, it can corrupt critical system structures, including kernel data structures, function pointers, or memory management metadata. This type of vulnerability falls under the common weakness enumeration CWE-787, which specifically addresses out-of-bounds write conditions in software. The exploitation mechanism often involves carefully crafted inputs that trigger the vulnerable code path, potentially leading to privilege escalation or system crashes.
The operational impact of this vulnerability extends beyond simple system instability to potentially enable more sophisticated attack vectors. A successful exploitation can result in immediate system panic and reboot, effectively creating a denial of service condition that may be exploited by malicious actors to disrupt services or potentially gain unauthorized access to system resources. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1068 which involves exploiting legitimate credentials or privileges to execute malicious code. The panic reboot condition may also provide an opportunity for attackers to observe system behavior or exploit timing-based attacks that rely on system instability.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and boundary checking within kernel modules. System administrators should prioritize applying vendor security patches and updates that address the specific out-of-bounds write conditions in affected kernel modules. Additional protective measures include enabling kernel address space layout randomization, implementing kernel module signing requirements, and deploying runtime monitoring solutions that can detect anomalous memory access patterns. The vulnerability underscores the importance of defensive programming practices in kernel development, particularly around buffer management and input validation. Organizations should also consider implementing network segmentation and access controls to limit potential attack surfaces, while maintaining comprehensive system monitoring to detect any signs of exploitation attempts or system instability that may indicate successful exploitation of this vulnerability.