Vulnerability in Op-Tee Optee OS
CVE-2022-46152
OP-TEE Trusted OS is the secure side implementation of OP-TEE project, a Trusted Execution Environment. Versions prior to 3.19.0, contain an Improper Validation of Array Index vulnerability. The function `cleanup_shm_refs()` is called by both `entry_invoke_command()` and `entry_open_session()`. The commands `OPTEE_MSG_CMD_OPEN_SESSION` and `OPTEE_MSG_CMD_INVOKE_COMMAND` can be executed from the normal world via an OP-TEE SMC. This function is not validating the `num_params` argument, which is only limited to `OPTEE_MSG_MAX_NUM_PARAMS` (127) in the function `get_cmd_buffer()`. Therefore, an attacker in the normal world can craft an SMC call that will cause out-of-bounds reading in `cleanup_shm_refs` and potentially freeing of fake-objects in the function `mobj_put()`. A normal-world attacker with permission to execute SMC instructions may exploit this flaw. Maintainers believe this problem permits local privilege escalation from the normal world to the secure world. Version 3.19.0 contains a fix for this issue. There are no known workarounds.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (40.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 41st percentile — 40.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Op-Tee Optee OS — versions < 3.19.0
- Trustedfirmware Op-Tee
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/OP-TEE/optee_os/security/advisories/GHSA-65w8-6mrg-52g7 (Exploit, Third Party Advisory)
- github.com/OP-TEE/optee_os/commit/728616b28df659cf0bdde6e58a471f6ef25d023c (Patch, Third Party Advisory)
- github.com/OP-TEE/optee_os/blob/c2d449482de098f1c894b94f338440e5a327813d/core/t… (Third Party Advisory)
- nvd.nist.gov/vuln-metrics/cvss/v3-calculator (US Government Resource, Third Party Advisory)
Frequently asked questions
- What is CVE-2022-46152?
- CVE-2022-46152 is a high-severity vulnerability in Op-Tee Optee OS, classified under Improper Validation of Array Index. CVSS score: 8.2/10. Published 2022-11-29.
- How severe is CVE-2022-46152?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2022-46152 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.