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.

Severity

 

CVSS Version 3.x CVSS Version 2.0

CVSS 3.x Severity and Metrics:

NIST: NVD

Base Score:  8.1 HIGH

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

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

CVSS 2.0 Severity and Metrics:

NIST: NVD

Base Score:  6.8 MEDIUM

Vector:  (AV:N/AC:M/Au:N/C:P/I:P/A:P)

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-787	Out-of-bounds Write	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

CVE Modified by MITRE 4/13/2020 11:15:11 AM

Action	Type	Old Value	New Value
Added	Reference		https://community.cypress.com/thread/53681 [No Types Assigned]

Initial Analysis by NIST 2/07/2020 9:57:38 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		OR *cpe:2.3:o:google:android:-:*:*:*:*:*:*:*
Added	CVSS V2		NIST (AV:N/AC:M/Au:N/C:P/I:P/A:P)
Added	CVSS V3.1		NIST AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Added	CWE		NIST CWE-787
Changed	Reference Type	https://source.android.com/security/bulletin/2019-08-01 No Types Assigned	https://source.android.com/security/bulletin/2019-08-01 Third Party Advisory
Changed	Reference Type	https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-google-android-os-could-allow-for-arbitrary-code-execution_2019-078/ No Types Assigned	https://www.cisecurity.org/advisory/multiple-vulnerabilities-in-google-android-os-could-allow-for-arbitrary-code-execution_2019-078/ Third Party Advisory
Changed	Reference Type	https://www.techrepublic.com/article/android-security-bulletin-august-2019-what-you-need-to-know/ No Types Assigned	https://www.techrepublic.com/article/android-security-bulletin-august-2019-what-you-need-to-know/ Third Party Advisory