CVE-2016-9380

Publication date 23 January 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

The pygrub boot loader emulator in Xen, when nul-delimited output format is requested, allows local pygrub-using guest OS administrators to read or delete arbitrary files on the host via NUL bytes in the bootloader configuration file.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
xen	17.04 zesty	Fixed 4.8.0-1ubuntu1
	16.10 yakkety	Fixed 4.7.0-0ubuntu2.1
	16.04 LTS xenial	Fixed 4.6.0-1ubuntu4.3
	14.04 LTS trusty	Fixed 4.4.2-0ubuntu0.14.04.9
	12.04 LTS precise	Fixed 4.1.6.1-0ubuntu0.12.04.13

Notes

mdeslaur

This is XSA-198

tyhicks

issue present in xen-utils-4.x binary packages which are in universe

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality impact	High
Integrity impact	High
Availability impact	None

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N