In this advisory we are disclosing a vulnerability in the Huawei log device that allows any unprivileged process to learn the value of randomized kernel pointers. The vulnerability can be used to defeat KASLR mitigation. Huawei kernels are shipped with custom log devices (/dev/hwlog_dubai, /dev/hwlog_exception and /dev/hwlog_jank) that facilitate better system diagnostics through a series of ioctl calls. One of these diagnostics module is referred to as memcheck, and it provides detailed statistics about the system memory usage. These statistics can disclose randomized kernel pointers to an attacker, enabling them to defeat the KASLR security mitigation. Due to an access control configuration error, these ioctls are exposed to untrusted and isolated application contexts, as a result any unprivileged process can exploit this vulnerability.

In this advisory we are disclosing a vulnerability in the Huawei log device that allows any unprivileged process to disclose sensitive information from the kernel. Huawei kernels are shipped with custom log devices (/dev/hwlog_dubai, /dev/hwlog_exception and /dev/hwlog_jank) that facilitate better system diagnostics through a series of ioctl calls. One of these diagnostics module is referred to as zrhung, and it provides information and configuration options to monitor hung processes. The implementation of the config set ioctl contains a race condition vulnerability that allows an attacker to free the underlying buffer that holds the configuration data. Consecutive config get ioctl calls use the dangling pointers to read and disclose, potentially sensitive, dynamically allocated kernel data.

In this advisory we are disclosing a memory corruption vulnerability in the Huawei log device that allows any unprivileged process to trigger a kernel crash and reboot the device. Huawei kernels are shipped with custom log devices (/dev/hwlog_dubai, /dev/hwlog_exception and /dev/hwlog_jank) that facilitate better system diagnostics through a series of ioctl calls. One of these diagnostics module is referred to as memcheck, and it provides detailed statistics about the system memory usage, including the allocations made by the SLAB kernel allocator. The implementation of this SLAB tracer contains a series of race condition vulnerabilities that could lead to kernel memory corruption and kernel deadlocks.

Summary Last year we published research at Black Hat in which we disclosed multiple vulnerabilities in Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allowed some SoC cores or DMA-capable peripherals to directly access secure world memory and completely compromise the entire memory of the SoC. This advisory focuses on a new access permission vulnerability in the same DMSS. The vulnerability can be used to entirely compromise the Trusted Execution Environment from the Baseband. The vulnerability was fixed in February 2022. Vulnerability Details The peripheral DMA lives up to its name, as it is mainly used to interact between multiple communication peripherals (e.

Summary There is a vulnerability in the Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allows the baseband to bypass the Baseband’s MPU memory protections and circumvent RO and NX protections. The vulnerability was fixed in February 2022. Vulnerability Details CVE-2021-22430 is a vulnerability in the Huawei Kirin SoC’s basebands which allowed to circumvent MPU restrictions. The vulnerability in CVE-2021-22430 was that MPU configuration was restored from a writable table for sleep cycles and therefore overwriting the cached entries resulted in new settings taking effect. This worked because the implementation normally only wrote the table once (not every time the core went to sleep) but restored the MPU configuration from it every time it was woken up.

Summary Last year we published research at Black Hat in which we disclosed multiple vulnerabilities in Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allowed some SoC cores or DMA-capable peripherals to directly access secure world memory and completely compromise the entire memory of the SoC. This advisory focuses on a new access permission vulnerability in the same DMSS. The vulnerability can be used to entirely compromise the SoC platform runtime (including all cores running in Secure World) directly from the Baseband. The vulnerability was fixed in February 2022. Vulnerability Details This vulnerability is very similar to CVE-2021-39991 (“Huawei DMSS Memory Access Management Configuration Unathorized Rewrite Via Peripheral DMA”).

Summary Last year we published research at Black Hat in which we disclosed multiple vulnerabilities in Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allowed some SoC cores or DMA-capable peripherals to directly access secure world memory and completely compromise the entire memory of the SoC. This advisory focuses on a new access permission vulnerability in the same DMSS. The vulnerability can be used to entirely compromise the SoC platform runtime (including all cores running in Secure World) directly from the Baseband. The vulnerability was fixed in February 2022. Vulnerability Details We have identified two related vulnerabilities related to the LPMSS subsystem of Huawei Kirin SoCs.

Summary Last year we published research at Black Hat in which we disclosed multiple vulnerabilities in Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allowed some SoC cores or DMA-capable peripherals to directly access secure world memory and completely compromise the entire memory of the SoC. This advisory focuses on a new access permission vulnerability in the same DMSS. The vulnerability can be used to entirely compromise the SoC platform runtime (including all cores running in Secure World) directly from the Baseband. The vulnerability was fixed in February 2022. Vulnerability Details This vulnerability is very similar to CVE-2021-37107 (“Huawei Peripheral DMA Memory Access Permission Bypass”).

Summary There is a vulnerability in the Huawei Kirin SoC’s DDR Controller (DMSS) Access Permission system which allows the Linux kernel to bypass memory access restrictions and directly compromise multiple privileged subsystems of the SoC. As demonstrated by CVE-2021-3710, CVE-2021-39991, CVE-2021-37115, and CVE-2021-39986, read and write of critical system memory, including secure memory regions, is possible via those subsystems. Therefore, this vulnerability combined with one of CVE-2021-3710, CVE-2021-39991, CVE-2021-37115, or CVE-2021-39986 results in a fully realized chain of elevation of privileges from a kernel-level write primitive to total control of the secure world (TEE). The vulnerability was fixed in February 2022.

Summary In this advisory we are disclosing a signature verification bypass vulnerability in the Huawei recovery mode. The vulnerability can be used not only to apply unauthentic firmware updates but also to achieve arbitrary code execution in the recovery mode. Combining this advisory with the vulnerability detailed in CVE-2021-40055, an attacker can achieve remote code execution without user interraction from the position of a network MITM. The vulnerability was fixed in February 2022. Vulnerability Details Huawei devices - both those running Android and those running HarmonyOS - implement a proprietary update solution which can be applied in various ways. The methods are all public and differ in how the process is triggered (manually or automatically) and how the update media file to be applied is supplied (downloaded over Wi-Fi or supplied from a memory card).