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A vulnerability in OP-TEE Trusted OS prior to version 3.19.0 exists due to improper validation of the array index in the cleanup_shm_refs() function. This function, invoked by entry_invoke_command() and entry_open_session(), does not properly validate the num_params argument, which can be controlled by a normal-world attacker via a crafted SMC call. This leads to out-of-bounds reads and potentially the freeing of fake objects in mobj_put(), enabling a local privilege escalation from the normal world to the secure world.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
Repository purpose: a reproducible QEMU v8 environment plus a local PoC to trigger CVE-2022-46152 in OP-TEE OS (<3.19.0). The vulnerability is an improper validation of num_params in core/tee/entry_std.c: entry_invoke_command() calls cleanup_shm_refs() with attacker-controlled num_params even when copy_in_params() rejects it, causing cleanup_shm_refs() to read beyond saved_attr[TEE_NUM_PARAMS=4] on the secure-world stack. This yields an out-of-bounds read of secure-world stack data and, if residual stack values match TMEM/RMEM attribute constants, can drive mobj_put() on attacker-influenced params leading to UAF/heap corruption. Key files/structure: - poc/cve_2022_46152.c: main PoC. Opens /dev/tee0, opens a session to the Hello World TA (hardcoded UUID 8aaaf200-2450-11e4-abe2-0002a5d5c51b), then issues TEE_IOC_INVOKE with num_params=31 (chosen because Linux TEE ioctl buffer limit TEE_MAX_ARG_SIZE=1024 caps params to 31). This bypasses libteec’s 4-parameter limit and triggers the secure-world OOB path. - exploit.sh: automation wrapper using expect to boot QEMU, log in as root, run /root/cve_2022_46152, and capture logs. It also starts a simple TCP server bound to 127.0.0.1:54321 to capture secure-world UART output. - run_qemu.sh: launches the OP-TEE QEMU v8 VM with two serial TCP endpoints: 54320 (Normal World console) and 54321 (Secure World log). Optionally exposes a GDB server on 1234. - setup.sh: fetches/builds the full OP-TEE QEMU v8 stack at tag 3.18.0 (vulnerable), builds the PoC with aarch64-linux-gnu-gcc, and injects it into the Buildroot overlay so it appears as /root/cve_2022_46152 in the guest. - docs/vulnerability_analysis.md: detailed root-cause and exploitation notes. - cve-2022-46152-oob-emsg.patch: debug-only patch adding an explicit EMSG() warning when num_params > TEE_NUM_PARAMS to make triggering visible on secure-world UART (not the real fix). - qemu-pflash-suppress-unimp-log.patch: cosmetic QEMU patch to suppress noisy pflash warnings. Overall capability: local (Normal World) trigger of a secure-world memory safety bug via crafted TEE ioctl messages; primarily a reproduction/PoC environment rather than a full weaponized exploit (no stable info-leak or controlled code execution chain included).
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