Ubuntu update for linux

Published: 2021-06-23

Risk	Medium
Patch available	YES
Number of vulnerabilities	3
CVE-ID	CVE-2021-3609 CVE-2021-3600 CVE-2021-23133
CWE-ID	CWE-362 CWE-125
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software	Ubuntu Operating systems & Components / Operating system linux-image-oem (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-gke (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-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-virtual-hwe-16.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency-hwe-16.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-generic-hwe-16.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-hwe (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-snapdragon (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-oracle-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-lowlatency (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-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-gcp-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-dell300x (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-azure-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-aws-lts-18.04 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-147-lowlatency (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-147-generic-lpae (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-147-generic (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1118-azure (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1106-snapdragon (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1106-aws (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1103-gcp (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1089-raspi2 (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1075-oracle (Ubuntu package) Operating systems & Components / Operating system package or component linux-image-4.15.0-1022-dell300x (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Race condition

EUVDB-ID: #VU54292

Risk: Medium

CVSSv4.0: 7.1 [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:P/U:Green]

CVE-ID: CVE-2021-3609

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Exploit availability: No

Description

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

The vulnerability exists due to a race condition in the CAN BCM networking protocol (net/can/bcm.c) in the Linux kernel ranging from version 2.6.25 to mainline 5.13-rc6. A local user can exploit the race and gain unauthorized access to sensitive information and escalate privileges on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 18.04

linux-image-oem (Ubuntu package): before 5.4.0.202.198

linux-image-oracle (Ubuntu package): before 6.8.0-1017.18~22.04.1

linux-image-gke (Ubuntu package): before 6.8.0-1015.19

linux-image-gcp (Ubuntu package): before 6.8.0-1019.21~22.04.1

linux-image-azure (Ubuntu package): before 6.8.0-1018.21~22.04.1

linux-image-virtual-hwe-16.04 (Ubuntu package): before 4.15.0.210.193

linux-image-lowlatency-hwe-16.04 (Ubuntu package): before 4.15.0.210.193

linux-image-generic-hwe-16.04 (Ubuntu package): before 4.15.0.210.193

linux-image-aws-hwe (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-virtual (Ubuntu package): before 4.15.0.147.134

linux-image-snapdragon (Ubuntu package): before 4.15.0.1106.109

linux-image-raspi2 (Ubuntu package): before 4.15.0.1089.86

linux-image-oracle-lts-18.04 (Ubuntu package): before 4.15.0.1075.85

linux-image-lowlatency (Ubuntu package): before 4.15.0.147.134

linux-image-generic-lpae (Ubuntu package): before 4.15.0.147.134

linux-image-generic (Ubuntu package): before 4.15.0.147.134

linux-image-gcp-lts-18.04 (Ubuntu package): before 4.15.0.1103.121

linux-image-dell300x (Ubuntu package): before 4.15.0.1022.24

linux-image-azure-lts-18.04 (Ubuntu package): before 4.15.0.1118.91

linux-image-aws-lts-18.04 (Ubuntu package): before 4.15.0.1106.109

linux-image-4.15.0-147-lowlatency (Ubuntu package): before 4.15.0-147.151

linux-image-4.15.0-147-generic-lpae (Ubuntu package): before 4.15.0-147.151

linux-image-4.15.0-147-generic (Ubuntu package): before 4.15.0-147.151

linux-image-4.15.0-1118-azure (Ubuntu package): before 4.15.0-1118.131

linux-image-4.15.0-1106-snapdragon (Ubuntu package): before 4.15.0-1106.115

linux-image-4.15.0-1106-aws (Ubuntu package): before 4.15.0-1106.113

linux-image-4.15.0-1103-gcp (Ubuntu package): before 4.15.0-1103.116

linux-image-4.15.0-1089-raspi2 (Ubuntu package): before 4.15.0-1089.94

linux-image-4.15.0-1075-oracle (Ubuntu package): before 4.15.0-1075.83

linux-image-4.15.0-1022-dell300x (Ubuntu package): before 4.15.0-1022.26

CPE2.3

External links

https://ubuntu.com/security/notices/USN-5003-1

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. However, proof of concept for this vulnerability is available.

2) Out-of-bounds read

EUVDB-ID: #VU92400

Risk: Low

CVSSv4.0: 5.9 [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:U/U:Clear]

CVE-ID: CVE-2021-3600

CWE-ID: CWE-125 - Out-of-bounds read

Exploit availability: No

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to out-of-bounds read error within the fixup_bpf_calls() function in kernel/bpf/verifier.c. A local user can execute arbitrary code.