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This vulnerability resides in the bootloader component of MediaTek’s System-on-a-Chip (SoC) firmware. The flaw exists due to improper validation of buffer sizes during the processing of certain bootloader commands, specifically within the handling of the `TZ` (TrustZone) or `lk` (Little Kernel) components. A local attacker with physical access or compromised kernel-level privileges can send a specially crafted, oversized buffer as part of a command to the bootloader’s communication interface. This triggers a heap-based buffer overflow in a high-privilege context. Successful exploitation corrupts adjacent critical memory structures, allowing the attacker to execute arbitrary code with the highest privileges of the bootloader. This bypasses all Android’s software-based security measures (including SELinux and verified boot stages), enabling permanent device compromise, installation of persistent rootkits, or bricking of the device.
Platform: MediaTek SoCs
Version: Multiple chipsets listed
Vulnerability: Bootloader buffer overflow
Severity: Critical
date: 2024-06-04
Prediction: Patch expected Q3 2024
What Undercode Say:
Check bootloader version adb shell getprop ro.boot.bootloader Look for Mediatek specific partitions adb shell ls -l /dev/block/platform/bootdevice/by-name/ Potential crash analysis log adb logcat -b crash | grep -i "lk|tz|aboot" Hypothetical PoC memory trigger (illustrative) echo -ne '\x41\x41\x41\x41' > /proc/bootloader_trigger
How Exploit:
Attacker gains local code execution (e.g., via a malicious app). The exploit code crafts a malicious payload exceeding expected buffer limits. It sends this payload via a vulnerable IOCTL or command channel to the bootloader’s firmware. The overflow overwrites function pointers or return addresses on the heap. The attacker redirects execution to their shellcode, gaining control of the bootloader execution flow to disable security or flash modified images.
Protection from this CVE:
Apply vendor patch. Restrict physical access. Use secure boot chain verification. Implement heap hardening/canaries in bootloader code. Validate all input buffer sizes strictly.
Impact:
Complete device compromise. Permanent persistence. Bypasses verified boot. Potential hardware bricking. Theft of encryption keys.
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Sources:
Reported By: nvd.nist.gov
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