Ubuntu update for xorg-server



| Updated: 2023-01-09
Risk Low
Patch available YES
Number of vulnerabilities 6
CVE-ID CVE-2022-4283
CVE-2022-46340
CVE-2022-46341
CVE-2022-46342
CVE-2022-46343
CVE-2022-46344
CWE-ID CWE-416
CWE-121
CWE-125
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Ubuntu
Operating systems & Components / Operating system

xserver-xorg-core-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

xwayland-hwe-18.04 (Ubuntu package)
Operating systems & Components / Operating system package or component

xwayland (Ubuntu package)
Operating systems & Components / Operating system package or component

xserver-xorg-core (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor Canonical Ltd.

Security Bulletin

This security bulletin contains information about 6 vulnerabilities.

1) Use-after-free

EUVDB-ID: #VU70438

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-2022-4283

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when handling XkbCopyNames requests. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.

Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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) Stack-based buffer overflow

EUVDB-ID: #VU70433

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-2022-46340

CWE-ID: CWE-121 - Stack-based buffer overflow

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error  within the swap handler for the XTestFakeInput request of the XTest extension if GenericEvents with lengths larger than 32 bytes are sent through a the XTestFakeInput request. A local user can trigger a stack-based buffer overflow and execute arbitrary code with elevated privileges.


Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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) Out-of-bounds read

EUVDB-ID: #VU70434

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-46341

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

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when handling XIPassiveUngrab requests. A local user can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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) Use-after-free

EUVDB-ID: #VU70435

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-2022-46342

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when handling XvdiSelectVideoNotify requests. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.


Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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.

5) Use-after-free

EUVDB-ID: #VU70436

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-2022-46343

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error when handling ScreenSaverSetAttributes requests. A local user can trigger a use-after-free error and execute arbitrary code with elevated privileges.



Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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.

6) Out-of-bounds read

EUVDB-ID: #VU70437

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2022-46344

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

Exploit availability: No

Description

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition when handling XIChangeProperty requests. A local user can trigger an out-of-bounds read error and read contents of memory on the system.

Mitigation

Update the affected package xorg-server to the latest version.

Vulnerable software versions

Ubuntu: 18.04 - 22.10

xserver-xorg-core-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland-hwe-18.04 (Ubuntu package): before 2:1.20.8-2ubuntu2.2~18.04.9

xwayland (Ubuntu package): before 2:1.19.6-1ubuntu4.13

xserver-xorg-core (Ubuntu package): before 2:1.19.6-1ubuntu4.13

CPE2.3 External links

https://ubuntu.com/security/notices/USN-5778-1


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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