Ubuntu update for linux



Published: 2023-03-07
Risk Low
Patch available YES
Number of vulnerabilities 6
CVE-ID CVE-2021-4155
CVE-2022-20566
CVE-2022-41858
CVE-2022-42895
CVE-2023-0045
CVE-2023-23559
CWE-ID CWE-264
CWE-416
CWE-476
CWE-824
CWE-254
CWE-190
Exploitation vector Local
Public exploit Public exploit code for vulnerability #5 is available.
Vulnerable software
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Ubuntu
Operating systems & Components / Operating system

linux-image-4.4.0-1116-aws (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-4.4.0-237-lowlatency (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-4.4.0-1117-kvm (Ubuntu package)
Operating systems & Components / Operating system package or component

linux-image-4.4.0-237-generic (Ubuntu package)
Operating systems & Components / Operating system package or component

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-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-generic (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-virtual (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU59812

Risk: Low

CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-4155

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

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

The vulnerability exists due to the OS kernel does not impose correctly security restrictions. A local user can gain access to sensitive information on the system.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


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.

2) Use-after-free

EUVDB-ID: #VU72526

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-2022-20566

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error within the l2cap_chan_put() function in Bluetooth L2CAP implementation. A local application can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


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) NULL pointer dereference

EUVDB-ID: #VU70467

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-41858

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within the sl_tx_timeout() function in drivers/net/slip in Linux kernel. A local user can perform a denial of service (DoS) attack.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


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.

4) Access of Uninitialized Pointer

EUVDB-ID: #VU69796

Risk: Low

CVSSv3.1: 2.1 [CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-42895

CWE-ID: CWE-824 - Access of Uninitialized Pointer

Exploit availability: No

Description

The vulnerability allows an attacker to gain access to sensitive information.

The vulnerability exists due to unauthorized access of uninitialized pointer within the l2cap_parse_conf_req() function in net/bluetooth/l2cap_core.c. An attacker with physical proximity to the affected device can gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


Q & A

Can this vulnerability be exploited remotely?

No. The attacker should have physical access to the system in order to successfully exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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

5) Security features bypass

EUVDB-ID: #VU72469

Risk: Low

CVSSv3.1: 2.6 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2023-0045

CWE-ID: CWE-254 - Security Features

Exploit availability: Yes

Description

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

The vulnerability exists due to Linux kernel does not correctly mitigate SMT attacks. A local user can bypass Spectre-BTI user space mitigations and gain access to sensitive information.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


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.

6) Integer overflow

EUVDB-ID: #VU72468

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-23559

CWE-ID: CWE-190 - Integer overflow

Exploit availability: No

Description

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

The vulnerability exists due to integer overflow within the rndis_query_oid() function in drivers/net/wireless/rndis_wlan.c. A local user can trigger an integer overflow and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package linux to the latest version.

Vulnerable software versions

Ubuntu: 14.04 - 16.04

linux-image-4.4.0-1116-aws (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-lowlatency (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-1117-kvm (Ubuntu package): before Ubuntu Pro

linux-image-4.4.0-237-generic (Ubuntu package): before Ubuntu Pro

linux-image-virtual-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-lowlatency-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

linux-image-generic-lts-xenial (Ubuntu package): before Ubuntu Pro (Infra-only)

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

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

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

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

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

External links

http://ubuntu.com/security/notices/USN-5926-1


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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