Ubuntu update for linux



| Updated: 2022-06-12
Risk Low
Patch available YES
Number of vulnerabilities 3
CVE-ID CVE-2022-1966
CVE-2022-21499
CVE-2022-30594
CWE-ID CWE-416
CWE-284
CWE-276
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

linux-image-virtual-lts-xenial (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-lowlatency-lts-xenial (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-4.4.0-1107-aws (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-generic-lts-xenial (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-kvm (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-aws (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-4.4.0-1108-kvm (Ubuntu package)
Other

linux-image-4.4.0-1143-aws (Ubuntu package)
Other

linux-image-4.4.0-227-generic (Ubuntu package)
Other

linux-image-4.4.0-227-lowlatency (Ubuntu package)
Other
Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 3 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU64070

Risk: Low

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:Clear]

CVE-ID: CVE-2022-1966

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a use-after-free error in the Linux kernel's Netfilter subsystem in net/netfilter/nf_tables_api.c. A local user can trigger use-after-free error to escalate privileges on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1107-aws (Ubuntu package): before 4.4.0.227.233

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1108-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1143-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-generic (Ubuntu package): before 4.4.0.227.233

linux-image-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-generic (Ubuntu package): before 4.4.0.227.233

linux-image-virtual (Ubuntu package): before 4.4.0.227.233

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5465-1


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) Improper access control

EUVDB-ID: #VU63961

Risk: Low

CVSSv4.0: 5.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-21499

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to improper access restrictions to the kernel debugger when booted in secure boot environments. A local privileged user can bypass UEFI Secure Boot restrictions.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1107-aws (Ubuntu package): before 4.4.0.227.233

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1108-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1143-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-generic (Ubuntu package): before 4.4.0.227.233

linux-image-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-generic (Ubuntu package): before 4.4.0.227.233

linux-image-virtual (Ubuntu package): before 4.4.0.227.233

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5465-1


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.

3) Incorrect default permissions

EUVDB-ID: #VU63631

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-2022-30594

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

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

The vulnerability exists due to mishandling seccomp permissions. A local user can bypass intended restrictions on setting the PT_SUSPEND_SECCOMP flag and escalate privileges on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-virtual-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1107-aws (Ubuntu package): before 4.4.0.227.233

linux-image-generic-lts-xenial (Ubuntu package): before 4.4.0.227.233

linux-image-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1108-kvm (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-1143-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-generic (Ubuntu package): before 4.4.0.227.233

linux-image-aws (Ubuntu package): before 4.4.0.227.233

linux-image-4.4.0-227-lowlatency (Ubuntu package): before 4.4.0.227.233

linux-image-generic (Ubuntu package): before 4.4.0.227.233

linux-image-virtual (Ubuntu package): before 4.4.0.227.233

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5465-1


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.



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