Multiple vulnerabilities in GRUB2



Published: 2022-06-08 | Updated: 2022-07-20
Risk High
Patch available YES
Number of vulnerabilities 8
CVE-ID CVE-2021-3695
CVE-2021-3696
CVE-2021-3697
CVE-2022-28733
CVE-2022-28734
CVE-2022-28735
CVE-2022-28736
CVE-2022-28737
CWE-ID CWE-787
CWE-191
CWE-345
CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
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grub
Universal components / Libraries / Libraries used by multiple products

Vendor GNU

Security Bulletin

This security bulletin contains information about 8 vulnerabilities.

1) Out-of-bounds write

EUVDB-ID: #VU64057

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3695

CWE-ID: CWE-787 - Out-of-bounds Write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when processing PNG grayscale images. A local privileged user can pass specially crafted PNG image to the application, trigger an out-of-bounds write error and potentially bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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) Out-of-bounds write

EUVDB-ID: #VU64059

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3696

CWE-ID: CWE-787 - Out-of-bounds Write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error when handling Huffman tables in the PNG reader. A local privileged user can pass specially crafted PNG image to the application, trigger an out-of-bounds write error and potentially bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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) Integer underflow

EUVDB-ID: #VU64061

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3697

CWE-ID: CWE-191 - Integer Underflow (Wrap or Wraparound)

Exploit availability: No

Description

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

The vulnerability exists due to integer underflow within the JPEG reader. A local privileged user can trigger an integer underflow and bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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) Integer underflow

EUVDB-ID: #VU64062

Risk: High

CVSSv3.1: 7.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28733

CWE-ID: CWE-191 - Integer Underflow (Wrap or Wraparound)

Exploit availability: No

Description

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to integer underflow when processing IP packets within the grub_net_recv_ip4_packets() function. A remote attacker can send specially crafted network traffic to the affected system, trigger an integer underflow and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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.

5) Out-of-bounds write

EUVDB-ID: #VU64063

Risk: Medium

CVSSv3.1: 6.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28734

CWE-ID: CWE-787 - Out-of-bounds Write

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a boundary error when processing split HTTP headerst. A remote attacker can send specially crafted traffic to the affected system, trigger an out-of-bounds write and execute arbitrary code on the target system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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.

6) Insufficient verification of data authenticity

EUVDB-ID: #VU64064

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28735

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No

Description

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

The vulnerability exists due to shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. A local privileged user can load unverified modules into GRUB and bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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.

7) Use-after-free

EUVDB-ID: #VU64065

Risk: Low

CVSSv3.1: 5.6 [CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28736

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

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

The vulnerability exists due to a use-after-free error in the grub_cmd_chainloader() function in chainloader command. A local privileged user can trigger a use-after-free error and bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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.

8) Out-of-bounds write

EUVDB-ID: #VU64067

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-28737

CWE-ID: CWE-787 - Out-of-bounds Write

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in the handle_image() function when shim tries to load and execute crafted EFI executables. A local privileged user can trigger an out-of-bounds write error and bypass secure boot protection mechanism.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

grub: 1.99 - 2.06


CPE2.3 External links

http://lists.gnu.org/archive/html/grub-devel/2022-06/msg00035.html

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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