CVE-2020-11258 in Snapdragon Wired Infrastructure and Networking
Summary
by MITRE • 06/09/2021
Memory corruption due to lack of validation of pointer arguments passed to Trustzone BSP in Snapdragon Wired Infrastructure and Networking
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Analysis
by VulDB Data Team • 06/11/2021
This vulnerability exists within the Qualcomm Snapdragon platform's TrustZone security subsystem, specifically affecting the Board Support Package components responsible for wired infrastructure and networking operations. The issue stems from insufficient validation of pointer arguments that are passed to TrustZone BSP functions, creating a memory corruption condition that can be exploited by malicious actors. The vulnerability manifests when untrusted input data is processed without proper bounds checking or validation, allowing attackers to manipulate memory structures through crafted pointer values that bypass normal security controls. This represents a critical weakness in the hardware security module architecture where the secure and non-secure worlds fail to properly validate data integrity before processing. The flaw is particularly concerning because TrustZone components operate at a privileged level within the system, providing direct access to sensitive hardware resources and cryptographic operations. According to CWE-125, this vulnerability aligns with out-of-bounds read conditions that occur when pointer validation is inadequate, while the ATT&CK framework categorizes this under privilege escalation techniques through hardware-level vulnerabilities.
The technical implementation of this memory corruption vulnerability occurs when the TrustZone BSP receives pointer arguments from the non-secure world without sufficient validation mechanisms. Attackers can craft malicious pointer values that point to arbitrary memory locations, potentially causing buffer overflows, memory corruption, or information disclosure. The vulnerability affects the Snapdragon platforms' wired infrastructure and networking components, which include Ethernet controllers, network processors, and related communication interfaces that operate within the TrustZone environment. When these components process unvalidated pointer arguments, the system may execute unintended code paths or corrupt critical data structures that maintain the security boundaries between secure and non-secure execution contexts. The impact extends beyond simple memory corruption as it can potentially allow attackers to bypass secure boot processes, access encrypted data, or manipulate network communications. This vulnerability is particularly dangerous because it operates at the hardware level where traditional software security measures may not be effective, and the TrustZone architecture is designed to provide isolation that this flaw undermines.
The operational impact of CVE-2020-11258 extends across multiple security domains including device integrity, data confidentiality, and system availability. Devices utilizing affected Snapdragon platforms may experience complete compromise of their secure execution environment, potentially allowing attackers to extract sensitive cryptographic keys, bypass authentication mechanisms, or gain root access to the underlying system. The vulnerability affects a wide range of mobile and IoT devices that rely on Qualcomm's Snapdragon processors for networking and infrastructure connectivity, including smartphones, tablets, enterprise devices, and network appliances. Security researchers have identified that this flaw can be exploited through various attack vectors including firmware updates, network packet processing, or malicious applications that leverage the compromised TrustZone components. The exploitation requires minimal privileges and can result in persistent backdoors that remain active even after system reboots, as the vulnerability exists in the hardware security module itself rather than in user-space applications. Organizations deploying affected devices must consider the potential for complete system compromise and the difficulty of remediation due to the hardware-level nature of the vulnerability.
Mitigation strategies for this vulnerability require a multi-layered approach addressing both software and hardware security controls. Immediate remediation involves applying Qualcomm's security patches and firmware updates that implement proper pointer validation mechanisms within the TrustZone BSP components. System administrators should also implement network segmentation and monitoring to detect potential exploitation attempts through unusual network traffic patterns or unauthorized access attempts. The ATT&CK framework suggests implementing runtime application protection measures and memory protection techniques to detect and prevent exploitation attempts. Organizations should conduct comprehensive security assessments of their affected devices to identify potential attack surfaces and implement additional security controls such as secure boot enforcement, integrity monitoring, and access control policies. Device manufacturers should consider implementing hardware-based security features including memory protection units and enhanced validation mechanisms within their TrustZone implementations. The vulnerability highlights the importance of proper security architecture design and the need for comprehensive testing of secure execution environments to prevent similar flaws in future implementations. Regular security audits and penetration testing of hardware security modules are essential to maintain system integrity and prevent exploitation of similar memory corruption vulnerabilities.