CVE-2019-11503

Publication date 24 April 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

snap-confine as included in snapd before 2.39 did not guard against symlink races when performing the chdir() to the current working directory of the calling user, aka a "cwd restore permission bypass."

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
snapd	19.10 eoan	Fixed 2.39.2+19.10ubuntu1
	19.04 disco	Fixed 2.39.2+19.04
	18.10 cosmic	Fixed 2.39.2+18.10
	18.04 LTS bionic	Fixed 2.39.2+18.04
	16.04 LTS xenial	Fixed 2.39.2ubuntu0.2
	14.04 LTS trusty	Fixed 2.43.3~14.04

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Notes

jdstrand

fixed via SRU process (security only users get the fix due to reexec) attack limited by snap-confine profile

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
snapd	Upstream: https://github.com/snapcore/snapd/pull/6642

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N