GLSA 202105-03: GPT fdisk: Integer underflow

http://security.gentoo.org/

Severity:	normal
Title:	GPT fdisk: Integer underflow
Date:	05/26/2021
Bugs:	#768762
ID:	202105-03

Synopsis

An integer underflow in sgdisk from GPT fdisk package might allow local attacker(s) to escalate privileges.

Background

GPT fdisk (consisting of the gdisk, cgdisk, sgdisk, and fixparts programs) is a set of text-mode partitioning tools for Linux, FreeBSD, Mac OS X, and Windows.

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
sys-apps/gptfdisk	< 1.0.6	>= 1.0.6	All supported architectures

Description

It was discovered that ReadLogicalParts() function in basicmbr.cc was missing a bounds check.

Impact

A local attacker could entice a user to insert a malicious formatted block device (USB stick or SD card for example), that, when processed with sgdisk, possibly resulting in local escalation of privileges or a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All GPT fdisk users should upgrade to the latest version:

      # emerge --sync
      # emerge --ask --oneshot --verbose ">=sys-apps/gptfdisk-1.0.6"

References

CVE-2021-0308

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-202105-03.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.