A bluez security update has been released for Debian GNU/Linux 8 Extended LTS.

ELA-522-1 bluez security update

Package bluez
Version 5.43-2+deb9u2~deb8u4
Related CVEs CVE-2019-8921 CVE-2019-8922 CVE-2021-41229

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 8 jessie, these problems have been fixed in version 5.43-2+deb9u2~deb8u4.

We recommend that you upgrade your bluez packages.

Further information about Extended LTS security advisories can be found at: https://deb.freexian.com/extended-lts/

  ELA-522-1 bluez security update