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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
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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/source-package/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