Ubuntu update for linux

Published: 2021-11-30

Risk	Medium
Patch available	YES
Number of vulnerabilities	4
CVE-ID	CVE-2021-3655 CVE-2021-37159 CVE-2021-3744 CVE-2021-3764
CWE-ID	CWE-909 CWE-415 CWE-401
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Ubuntu Operating systems & Components / Operating system linux-image-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1064-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke-5.4 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-raspi (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-91-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem-osp1 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1060-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1008-ibm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1058-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-91-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-ibm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-91-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1050-kvm (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop-5.4 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-azure-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-ibm-lts-20.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1056-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1022-bluefield (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1027-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1058-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-bluefield (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gke (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oem (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gkeop (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-5.4.0-1047-raspi (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-raspi-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-snapdragon-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-lpae-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 4 vulnerabilities.

1) Missing initialization of resource

EUVDB-ID: #VU61098

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3655

CWE-ID: CWE-909 - Missing initialization of resource

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to sensitive information.

The vulnerability exists due to missing initialization of resource in the Linux kernel when processing inbound SCTP packets. A remote attacker can send specially crafted SCTP packets to the system and force the kernel to read uninitialized memory.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 20.04

linux-image-lowlatency (Ubuntu package): before 5.4.0.91.95

linux-image-5.4.0-1064-azure (Ubuntu package): before 5.4.0-1064.67~18.04.1

linux-image-generic-lpae (Ubuntu package): before 5.4.0.91.95

linux-image-kvm (Ubuntu package): before 5.4.0.1050.49

linux-image-gke-5.4 (Ubuntu package): before 5.4.0.1056.66

linux-image-raspi (Ubuntu package): before 5.4.0.1047.82

linux-image-oracle-lts-20.04 (Ubuntu package): before 5.4.0.1058.58

linux-image-5.4.0-91-generic-lpae (Ubuntu package): before 5.4.0-91.102~18.04.1

linux-image-oem-osp1 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-5.4.0-1060-aws (Ubuntu package): before 5.4.0-1060.63~18.04.1

linux-image-5.4.0-1008-ibm (Ubuntu package): before 5.4.0-1008.9

linux-image-5.4.0-1058-gcp (Ubuntu package): before 5.4.0-1058.62~18.04.1

linux-image-aws-lts-20.04 (Ubuntu package): before 5.4.0.1060.63

linux-image-5.4.0-91-generic (Ubuntu package): before 5.4.0-91.102~18.04.1

linux-image-ibm (Ubuntu package): before 5.4.0.1008.9

linux-image-5.4.0-91-lowlatency (Ubuntu package): before 5.4.0-91.102~18.04.1

linux-image-gcp-lts-20.04 (Ubuntu package): before 5.4.0.1058.68

linux-image-5.4.0-1050-kvm (Ubuntu package): before 5.4.0-1050.52

linux-image-raspi2 (Ubuntu package): before 5.4.0.1047.82

linux-image-gkeop-5.4 (Ubuntu package): before 5.4.0.1027.30

linux-image-azure-lts-20.04 (Ubuntu package): before 5.4.0.1064.62

linux-image-ibm-lts-20.04 (Ubuntu package): before 5.4.0.1008.9

linux-image-5.4.0-1056-gke (Ubuntu package): before 5.4.0-1056.59~18.04.1

linux-image-5.4.0-1022-bluefield (Ubuntu package): before 5.4.0-1022.25

linux-image-5.4.0-1027-gkeop (Ubuntu package): before 5.4.0-1027.28~18.04.1

linux-image-5.4.0-1058-oracle (Ubuntu package): before 5.4.0-1058.62~18.04.1

linux-image-bluefield (Ubuntu package): before 5.4.0.1022.23

linux-image-gke (Ubuntu package): before 5.4.0.1056.66

linux-image-oem (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-generic (Ubuntu package): before 5.4.0.91.95

linux-image-virtual (Ubuntu package): before 5.4.0.91.95

linux-image-gkeop (Ubuntu package): before 5.4.0.1027.30

linux-image-5.4.0-1047-raspi (Ubuntu package): before 5.4.0-1047.52~18.04.1

linux-image-azure (Ubuntu package): before 5.4.0.1064.44

linux-image-raspi-hwe-18.04 (Ubuntu package): before 5.4.0.1047.50

linux-image-gcp (Ubuntu package): before 5.4.0.1058.44

linux-image-virtual-hwe-18.04 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-snapdragon-hwe-18.04 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-oracle (Ubuntu package): before 5.4.0.1058.62~18.04.38

linux-image-lowlatency-hwe-18.04 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-generic-lpae-hwe-18.04 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-generic-hwe-18.04 (Ubuntu package): before 5.4.0.91.102~18.04.81

linux-image-aws (Ubuntu package): before 5.4.0.1060.43

External links

http://ubuntu.com/security/notices/USN-5163-1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Double Free

EUVDB-ID: #VU63575

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-37159

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

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

The vulnerability exists due to hso_free_net_device() function in drivers/net/usb/hso.c in the Linux kernel calls unregister_netdev without checking for the NETREG_REGISTERED state. A local user can trigger double free and use-after-free errors and execute arbitrary code with elevated privileges.