UnratedPyPIAmendedPublished
Buffer overflow in deprecated USB HALs and stack overflow in USB enumeration
GHSA-f366-4rvv-95x2
- Affected
- PyPI cryptoauthlib < 20200912
- Fixed in
- 20200912· Vendor fix available
- Issue
- Impact 1) If an application is making use of the deprecated kit protocol HALs as the communication channel to the target device an attacker can masquerade as a device and return malformed packets of arbitrary length which the protocol stack will write to the stack. HALs intended for production use are unaffected (I2C, SWI, & SPI) as well as the hidapi HAL (halallplatformskithidapi.c). 2) The hidapi HAL can be made to overrun the application stack by attaching more than 10 (real or virtual) devices likely resulting in an application crash as this does not allow arbitrary data to be written to the stack. Patches USB kit enumeration has been patched in v3.2.3 for the hidapi HAL (halallplatformskithidapi.c). Removal of deprecated HALs Deprecated usb kit HALs have been removed in v3.2.3. Workarounds This vulnerability is limited to users of the kit protocol which is used with Microchip kits and kit firmware to bridge communication from USB-HID to I2C or SWI. It is not expected that kits…
Recommended action: Upgrade to 20200912 or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.