SB2021063039 - Privilege escalation in Tianocore EDK II

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Heap-based buffer overflow (CVE-ID: CVE-2021-28211)

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

The vulnerability exists due to a boundary error within the LzmaUefiDecompressGetInfo() function. A local user can run a specially crafted program to trigger a heap-based buffer overflow and execute arbitrary code with elevated privileges.

2) NULL pointer dereference (CVE-ID: CVE-2019-14584)

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

The vulnerability exists due to a NULL pointer dereference error. A local user can run a specially crafted program to escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://bugzilla.tianocore.org/show_bug.cgi?id=1816
• https://bugzilla.redhat.com/show_bug.cgi?id=1889486