Ubuntu update for bluez



Risk Medium
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2021-3658
CVE-2021-41229
CVE-2021-43400
CWE-ID CWE-863
CWE-401
CWE-416
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

bluez (Ubuntu package)
Operating systems & Components / Operating system package or component

libbluetooth3 (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Incorrect authorization

EUVDB-ID: #VU83408

Risk: Low

CVSSv4.0: 0.4 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-3658

CWE-ID: CWE-863 - Incorrect Authorization

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to sensitive information.

The vulnerability exists due to bluetoothd incorrectly saves the adapters' discoverable status when a device is powered down, and restores it when powered up. An attacker with physical proximity to device can gain access to sensitive information.

Mitigation

Update the affected package bluez to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

bluez (Ubuntu package): before 5.48-0ubuntu3.6

libbluetooth3 (Ubuntu package): before 5.48-0ubuntu3.6

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5155-1


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Memory leak

EUVDB-ID: #VU79524

Risk: Medium

CVSSv4.0: 1.7 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-41229

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak in sdp_cstate_alloc_buf() function. A remote attacker can send specially crafted packets to the device and perform denial of service attack.

Mitigation

Update the affected package bluez to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

bluez (Ubuntu package): before 5.48-0ubuntu3.6

libbluetooth3 (Ubuntu package): before 5.48-0ubuntu3.6

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5155-1


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

3) Use-after-free

EUVDB-ID: #VU83407

Risk: Medium

CVSSv4.0: 3.7 [CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-43400

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows an attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error in gatt-database.c on a gatt server if a client disconnects while a WriteValue call is being processed with D-Bus. An attacker with physical proximity to the system can trigger a use-after-free error and potentially execute arbitrary code.

Mitigation

Update the affected package bluez to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 21.10

bluez (Ubuntu package): before 5.48-0ubuntu3.6

libbluetooth3 (Ubuntu package): before 5.48-0ubuntu3.6

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5155-1


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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