Buffer overflow in Azure-Rtos Usbx
CVE-2022-36063
Azure RTOS USBx is a USB host, device, and on-the-go (OTG) embedded stack, fully integrated with Azure RTOS ThreadX and available for all Azure RTOS ThreadX–supported processors. Azure RTOS USBX implementation of host support for USB CDC ECM includes an integer underflow and a buffer overflow in the `_ux_host_class_cdc_ecm_mac_address_get` function which may be potentially exploited to achieve remote code execution or denial of service. Setting mac address string descriptor length to a `0` or `1` allows an attacker to introduce an integer underflow followed (string_length) by a buffer overflow of the `cdc_ecm -> ux_host_class_cdc_ecm_node_id` array. This may allow one to redirect the code execution flow or introduce a denial of service. The fix has been included in USBX release [6.1.12](https://github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel). Improved mac address string descriptor length validation to check for unexpectedly small values may be used as a workaround.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: +0.000
Affected products
- Azure-Rtos Usbx — versions < 6.1.12
- Eclipse Threadx Usbx
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/azure-rtos/usbx/security/advisories/GHSA-chpp-5fv9-6368 (Exploit, Patch, Third Party Advisory)
- github.com/azure-rtos/usbx/blob/master/common/usbx_host_classes/src/ux_host_cla… (Exploit, Third Party Advisory)
- github.com/azure-rtos/usbx/releases/tag/v6.1.12_rel (Patch, Third Party Advisory, Release Notes)
Frequently asked questions
- What is CVE-2022-36063?
- CVE-2022-36063 is a high-severity vulnerability in Azure-Rtos Usbx, classified under Stack-based Buffer Overflow. CVSS score: 7.6/10. Published 2022-10-10.
- How severe is CVE-2022-36063?
- High severity. CVSS v3 base score is 7.6 out of 10.
- Is CVE-2022-36063 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.