An integer underflow in sgdisk from GPT fdisk package might allow local attacker(s) to escalate privileges.
|Package||sys-apps/gptfdisk on all architectures|
|Affected versions||< 1.0.6|
|Unaffected versions||>= 1.0.6|
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.
It was discovered that ReadLogicalParts() function in basicmbr.cc was missing a bounds check.
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.
There is no known workaround at this time.
All GPT fdisk users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose ">=sys-apps/gptfdisk-1.0.6"
May 26, 2021
May 26, 2021: 1