CVE-2019-11516 Information

Description

An issue was discovered in the Bluetooth component of the Cypress (formerly owned by Broadcom) Wireless IoT codebase. Extended Inquiry Responses (EIRs) are improperly handled which causes a heap-based buffer overflow during device inquiry. This overflow can be used to overwrite existing functions with arbitrary code. The Reserved for Future Use (RFU) bits are not discarded by eir_handleRx() and are included in an EIR’s length. Therefore one can exceed the expected 240 bytes which leads to a heap-based buffer overflow in eir_getReceivedEIR() called by bthci_event_SendInquiryResultEvent(). In order to exploit this bug an attacker must repeatedly connect to the victim’s device in a short amount of time from different source addresses. This will cause the victim’s Bluetooth stack to resolve the device names and therefore allocate buffers with attacker-controlled data. Due to the heap corruption the name will be eventually written to an attacker-controlled location leading to a write-what-where condition.

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://community.cypress.com/thread/53681 https://source.android.com/security/bulletin/2019-08-01 https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-google-android-os-could-allow-for-arbitrary-code-execution_2019-078/ https://www.techrepublic.com/article/android-security-bulletin-august-2019-what-you-need-to-know/

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.1