Ubuntu update for linux-gke

1) Double Free

EUVDB-ID: #VU63766

Risk: High

CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Amber]

CVE-ID: CVE-2021-22600

CWE-ID: CWE-415 - Double Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error in the packet_set_ring() function in net/packet/af_packet.c. A local user can pass specially crafted data to the application, trigger double free error and escalate privileges on the system.

Note, the vulnerability is being actively exploited in the wild against Android users.

Mitigation

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

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-5.4.0-1061-gke (Ubuntu package): before 5.4.0-1061.64~18.04.1

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1061.64~18.04.25

linux-image-gke (Ubuntu package): before 5.4.0.1061.71

CPE2.3

• cpe:2.3:o:canonical:ubuntu:18.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:ubuntu:20.04:*:*:*:*:*:*:*
• cpe:2.3:o:canonical:linux-image-5.4.0-1061-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-gke-5.4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5266-1

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?

Yes. This vulnerability is being exploited in the wild.

2) Buffer overflow

EUVDB-ID: #VU59474

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

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-gke to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-5.4.0-1061-gke (Ubuntu package): before 5.4.0-1061.64~18.04.1

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1061.64~18.04.25

linux-image-gke (Ubuntu package): before 5.4.0.1061.71

CPE2.3

• cpe:2.3:o:canonical:linux-image-5.4.0-1061-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-gke-5.4_ubuntu_package:*:*:*:*:*:ubuntu:*:*
• cpe:2.3:o:canonical:linux-image-gke_ubuntu_package:*:*:*:*:*:ubuntu:*:*

External links

https://ubuntu.com/security/notices/USN-5266-1

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.