A bluez security update has been released for Debian GNU/Linux 9 LTS.

DLA 2827-1: bluez security update

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2827-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Sylvain Beucler
November 27, 2021   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : bluez
Version : 5.43-2+deb9u5
CVE ID : CVE-2019-8921 CVE-2019-8922 CVE-2021-41229
Debian Bug : 1000262

Several vulnerabilities were discovered in BlueZ, the Linux Bluetooth
protocol stack. An attacker could cause a denial-of-service (DoS) or
leak information.

CVE-2019-8921

SDP infoleak; the vulnerability lies in the handling of a
SVC_ATTR_REQ by the SDP implementation of BlueZ. 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.

CVE-2019-8922

SDP Heap Overflow; this vulnerability lies in the SDP protocol
handling of attribute requests as well. By requesting a huge
number of attributes at the same time, an attacker can overflow
the static buffer provided to hold the response.

CVE-2021-41229

sdp_cstate_alloc_buf allocates memory which will always be hung in
the singly linked list of cstates and will not be freed. This will
cause a memory leak over time. The data can be a very large
object, which can be caused by an attacker continuously sending
sdp packets and this may cause the service of the target device to
crash.

For Debian 9 stretch, these problems have been fixed in version
5.43-2+deb9u5.

We recommend that you upgrade your bluez packages.

For the detailed security status of bluez please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/bluez

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS