Insufficient Verification of Data Authenticity Affecting bluez package, versions <5.48-0ubuntu3.6


Severity

Recommended
0.0
medium
0
10

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.15% (52nd percentile)

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  • Snyk IDSNYK-UBUNTU1804-BLUEZ-1930896
  • published25 Nov 2021
  • disclosed29 Nov 2021

Introduced: 25 Nov 2021

CVE-2019-8921  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 bluez to version 5.48-0ubuntu3.6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream bluez package and not the bluez package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.

CVSS Scores

version 3.1