Vulnerability Details CVE-2019-11516
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 69.2%
CVSS Severity
CVSS v3 Score 8.1
CVSS v2 Score 6.8
References
- 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/
- 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/