CVE-2019-8921

Publication date 29 November 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

An issue was discovered in bluetoothd in BlueZ through 5.48. The vulnerability lies in the handling of a SVC_ATTR_REQ by the SDP implementation. By crafting a malicious CSTATE, it is possible to trick the server into returning more bytes than the buffer actually holds, resulting in leaking arbitrary heap data. The root cause can be found in the function service_attr_req of sdpd-request.c. The server does not check whether the CSTATE data is the same in consecutive requests, and instead simply trusts that it is the same.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
bluez	24.04 LTS noble	Not affected
	23.10 mantic	Not affected
	23.04 lunar	Not affected
	22.10 kinetic	Not affected
	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Fixed 5.48-0ubuntu3.6
	16.04 LTS xenial	Vulnerable
	14.04 LTS trusty	Ignored

Notes

mdeslaur

This was fixed in bionic by CVE-2021-41229-pre1.patch

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
bluez	Upstream: ?id=7bf

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Adjacent
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N