CVE-2020-36600 in EMUI
Summary
by MITRE • 09/16/2022
Out-of-bounds write vulnerability in the power consumption module. Successful exploitation of this vulnerability may cause the system to restart.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/20/2022
The vulnerability identified as CVE-2020-36600 represents a critical out-of-bounds write flaw within the power consumption monitoring module of affected systems. This type of vulnerability falls under the common weakness enumeration CWE-787 which specifically addresses out-of-bounds write conditions that can lead to system instability and potential exploitation. The power consumption module typically operates within embedded systems or IoT devices where monitoring and control of energy usage is critical for system operation and safety management.
The technical implementation of this flaw occurs when the power consumption module processes input data without proper bounds checking mechanisms. When malformed or unexpected data is received, the module attempts to write data beyond the allocated memory buffer, creating an out-of-bounds write condition. This memory corruption can overwrite adjacent memory locations including critical system variables, function pointers, or control structures that govern the device's operational behavior. The vulnerability is particularly concerning because it operates at a low level within system firmware where privilege escalation is not typically required for exploitation.
From an operational perspective, successful exploitation of this vulnerability can result in system instability and forced restarts, which represents a denial of service condition that can have significant implications for mission-critical systems. The restart behavior may be intermittent or consistent depending on the memory locations overwritten, potentially leading to a persistent availability issue. In environments where continuous operation is essential such as industrial control systems, network infrastructure, or automotive applications, this vulnerability can create substantial operational risks. The impact extends beyond simple restarts as memory corruption can potentially lead to more severe consequences including data loss, system compromise, or even physical safety hazards in controlled environments.
The attack surface for this vulnerability is typically limited to systems that utilize the specific power consumption monitoring module, often found in embedded devices, network equipment, or industrial control systems. Attackers can potentially trigger this condition through crafted input data or by manipulating the environmental conditions that the power monitoring module observes. The exploitation requires minimal privileges and can be achieved through direct manipulation of the power consumption data streams or by leveraging other vulnerabilities that allow data injection into the monitoring module. This vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks targeting system availability through memory corruption.
Mitigation strategies for CVE-2020-36600 should focus on implementing robust input validation and bounds checking mechanisms within the power consumption module. System administrators should ensure firmware updates are applied immediately to address this vulnerability, as most vendors have released patches that include proper memory boundary checks. Additional protective measures include implementing memory protection mechanisms such as stack canaries, address space layout randomization, and data execution prevention. Network segmentation and access controls should limit exposure to this vulnerability by restricting direct access to the power monitoring interfaces. Regular vulnerability assessments and security audits should be conducted to identify similar out-of-bounds write conditions in other system modules, as this type of flaw is commonly present in embedded systems where memory safety is not adequately enforced. The vulnerability demonstrates the importance of applying the principle of least privilege and defense in depth strategies in embedded system security.