Fedora 35 update for shim, shim-unsigned-aarch64, shim-unsigned-x64



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2022-28737
CWE-ID CWE-787
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Fedora
Operating systems & Components / Operating system

shim-unsigned-x64
Operating systems & Components / Operating system package or component

shim-unsigned-aarch64
Operating systems & Components / Operating system package or component

shim
Operating systems & Components / Operating system package or component

Vendor Fedoraproject

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Out-of-bounds write

EUVDB-ID: #VU64067

Risk: Low

CVSSv4.0: 5.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

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 repository.

Vulnerable software versions

Fedora: 35

shim-unsigned-x64: before 15.6-1

shim-unsigned-aarch64: before 15.6-1

shim: before 15.6-1

CPE2.3 External links

https://bodhi.fedoraproject.org/updates/FEDORA-2022-98830efc68


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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