CVE-2019-8921

Name	CVE-2019-8921
Description	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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2827-1, DLA-3157-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
bluez (PTS)	buster	5.50-1.2~deb10u2	vulnerable
	buster (security)	5.50-1.2~deb10u4	fixed
	bullseye (security), bullseye	5.55-3.1+deb11u1	fixed
	bookworm, bookworm (security)	5.66-1+deb12u1	fixed
	trixie	5.71-1	fixed
	sid	5.73-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
bluez	source	stretch	5.43-2+deb9u5	DLA-2827-1
bluez	source	buster	5.50-1.2~deb10u3	DLA-3157-1
bluez	source	(unstable)	5.54-1

Notes

https://ssd-disclosure.com/ssd-advisory-linux-bluez-information-leak-and-heap-overflow/
https://git.kernel.org/pub/scm/bluetooth/bluez.git/commit/?id=7bf67b32709d828fafa26256b4c78331760c6e93 (5.51)