Critical severity · published May 24, 2022
CVE-2022-29223
Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack
9.8
CVSS
1.2%
EPSS
No
On KEV
Description
Azure RTOS USBX is a USB host, device, and on-the-go (OTG) embedded stack. In versions prior to 6.1.10, an attacker can cause a buffer overflow by providing the Azure RTOS USBX host stack a HUB descriptor with `bNbPorts` set to a value greater than `UX_MAX_TT` which defaults to 8. For a `bNbPorts` value of 255, the implementation of `ux_host_class_hub_descriptor_get` function will modify the contents of `hub` -> `ux_host_class_hub_device` -> `ux_device_hub_tt` array violating the end boundary by 255 - `UX_MAX_TT` items. The USB host stack needs to validate the number of ports reported by the hub, and if the value is larger than UX_MAX_TT, USB stack needs to reject the request. This fix has been included in USBX release 6.1.10.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TU
Threadx Usbx · Eclipse
before 6.1.10 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2022-29223
CVE.org
https://www.cve.org/CVERecord?id=CVE-2022-29223
Release Notes
https://github.com/azure-rtos/usbx/releases/tag/v6.1.10_rel
Release Notes
https://github.com/azure-rtos/usbx/security/advisories/GHSA-2qc5-385m-x862
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