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The vulnerability resides in the MediaTek GNSS (Global Navigation Satellite System) firmware driver (mtk-gnss-driver.ko). The issue is an integer overflow within the location request handling mechanism. When processing a specific type of LocationRequest, the driver performs arithmetic calculations to determine the size of a memory allocation. An attacker can craft a malicious request with manipulated size fields, causing an integer overflow that results in an undersized buffer being allocated. Subsequent data copying operations then write beyond the bounds of this buffer, leading to a heap-based buffer overflow. This memory corruption can be leveraged to execute arbitrary code with kernel privileges, providing full control over the affected system-on-chip (SoC). The exploit is triggered via a malformed AT command sent to the modem interface.
Platform: MediaTek Chipsets
Version: Multiple Models
Vulnerability: GNSS Driver Overflow
Severity: Critical
date: 2024-04-05
Prediction: Patch expected 2024-04-30
What Undercode Say:
find /lib/modules -name "gnss" strings mtk-gnss-driver.ko | grep -i "location" cat /proc/iomem | grep -i gnss adb pull /vendor/firmware/mt6631_fm_cust.cfg xxd -ps gnss_fw.bin | head -50
How Exploit:
AT+EGMRCMD=128,"<malformed_location_payload>"
Protection from this CVE
Update device firmware
Apply vendor patch
Restrict modem access
Impact:
Kernel privilege escalation
Full device compromise
Bypasses security boundaries
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
