Ubuntu update for linux-raspi

1) Use-after-free

EUVDB-ID: #VU63769

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3640

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in sco_sock_sendmsg() function of the Linux kernel HCI subsystem. A privileged local user can call ioct UFFDIO_REGISTER or other way trigger race condition to escalate privileges on the system.

Mitigation

Update the affected package linux-raspi to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-raspi2 (Ubuntu package): before 5.4.0.1052.86

linux-image-raspi (Ubuntu package): before 5.4.0.1052.86

linux-image-5.4.0-1052-raspi (Ubuntu package): before 5.4.0-1052.58~18.04.1

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1052.54

External links

http://ubuntu.com/security/notices/USN-5267-3

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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

2) Use-after-free

EUVDB-ID: #VU63767

Risk: Low

CVSSv3.1: 6.2 [CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3752

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to a use-after-free error in the Linux kernel’s Bluetooth subsystem when a user calls connect to the socket and disconnect simultaneously. A local user can escalate privileges on the system.

Mitigation

Update the affected package linux-raspi to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-raspi2 (Ubuntu package): before 5.4.0.1052.86

linux-image-raspi (Ubuntu package): before 5.4.0.1052.86

linux-image-5.4.0-1052-raspi (Ubuntu package): before 5.4.0-1052.58~18.04.1

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1052.54

External links

http://ubuntu.com/security/notices/USN-5267-3

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the local network (LAN).

Is there known malware, which exploits this vulnerability?

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

3) Buffer overflow

EUVDB-ID: #VU59474

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-42739

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a boundary within the firewire subsystem in the Linux kernel in drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c files. A local privileged user can run a specially crafted program tat calls avc_ca_pmt() function to trigger memory corruption and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux-raspi to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-raspi2 (Ubuntu package): before 5.4.0.1052.86

linux-image-raspi (Ubuntu package): before 5.4.0.1052.86

linux-image-5.4.0-1052-raspi (Ubuntu package): before 5.4.0-1052.58~18.04.1

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1052.54

External links

http://ubuntu.com/security/notices/USN-5267-3

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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