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AUSCERT External Security Bulletin Redistribution
ESB-2021.2145
USN-4989-1 and USN-4989-2: BlueZ vulnerabilities
17 June 2021
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AusCERT Security Bulletin Summary
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Product: BlueZ
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands — Remote/Unauthenticated
Denial of Service — Remote/Unauthenticated
Provide Misleading Information — Remote/Unauthenticated
Access Confidential Data — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3588 CVE-2020-27153 CVE-2020-26558
Reference: ESB-2021.2023
ESB-2021.1999
ESB-2021.1976
Original Bulletin:
https://ubuntu.com/security/notices/USN-4989-1
https://ubuntu.com/security/notices/USN-4989-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-4989-1: BlueZ vulnerabilities
16 June 2021
Several security issues were fixed in BlueZ.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o bluez – Bluetooth tools and daemons
Details
It was discovered that BlueZ incorrectly checked certain permissions when
pairing. A local attacker could possibly use this issue to impersonate
devices. ( CVE-2020-26558 )
Jay LV discovered that BlueZ incorrectly handled redundant disconnect MGMT
events. A local attacker could use this issue to cause BlueZ to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. ( CVE-2020-27153 )
Ziming Zhang discovered that BlueZ incorrectly handled certain array
indexes. A local attacker could use this issue to cause BlueZ to crash,
resulting in a denial of service, or possibly obtain sensitive information.
This issue only affected Ubuntu 20.04 LTS and Ubuntu 20.10. ( CVE-2021-3588 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o libbluetooth3 – 5.56-0ubuntu4.1
o bluez – 5.56-0ubuntu4.1
Ubuntu 20.10
o libbluetooth3 – 5.55-0ubuntu1.2
o bluez – 5.55-0ubuntu1.2
Ubuntu 20.04
o libbluetooth3 – 5.53-0ubuntu3.2
o bluez – 5.53-0ubuntu3.2
Ubuntu 18.04
o libbluetooth3 – 5.48-0ubuntu3.5
o bluez – 5.48-0ubuntu3.5
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3588
o CVE-2020-26558
o CVE-2020-27153
Related notices
o USN-4989-2 : bluez, bluez-cups, bluez-tests, bluez-obexd, bluetooth,
libbluetooth3, bluez-hcidump, libbluetooth-dev
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USN-4989-2: BlueZ vulnerabilities
16 June 2021
Several security issues were fixed in BlueZ.
Releases
o Ubuntu 16.04 ESM
Packages
o bluez – Bluetooth tools and daemons
Details
USN-4989-1 fixed several vulnerabilities in BlueZ. This update provides
the corresponding update for Ubuntu 16.04 ESM.
Original advisory details:
It was discovered that BlueZ incorrectly checked certain permissions when
pairing. A local attacker could possibly use this issue to impersonate
devices. ( CVE-2020-26558 )
Jay LV discovered that BlueZ incorrectly handled redundant disconnect MGMT
events. A local attacker could use this issue to cause BlueZ to crash,
resulting in a denial of service, or possibly execute arbitrary code. This
issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. ( CVE-2020-27153 )
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o libbluetooth3 – 5.37-0ubuntu5.3+esm1
Available with UA Infra or UA Desktop
o bluez – 5.37-0ubuntu5.3+esm1
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-26558
o CVE-2020-27153
Related notices
o USN-4989-1 : bluez, libbluetooth-dev, bluez-tests, bluez-cups, bluetooth,
bluez-hcidump, bluez-obexd, libbluetooth3
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT’s members. As
AusCERT did not write the document quoted above, AusCERT has had no control
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NOTE: This is only the original release of the security bulletin. It may
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Contact information for the authors of the original document is included
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Previous advisories and external security bulletins can be retrieved from:
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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