Bug 1550122 – CVE-2018-1063 policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead

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Bug 1550122 - (CVE-2018-1063) CVE-2018-1063 policycoreutils: Relabelling of symbolic links in /tmp and /var/tmp change the context of their target instead

Summary:	CVE-2018-1063 policycoreutils: Relabelling of symbolic links in /tmp and /var...

Status:	CLOSED ERRATA

Aliases:	CVE-2018-1063

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20180228,reported=2...
Keywords:	Security

Depends On:
Blocks:	1498774 1545726
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Reported:	2018-02-28 09:44 EST by Richard Maciel Costa
Modified:	2018-04-10 04:34 EDT (History)
CC List:	11 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	Context relabeling of filesystems is vulnerable to symbolic link attack, allowing a local, unprivileged malicious entity to change the SELinux context of an arbitrary file to a context with few restrictions. This only happens when the relabeling process is done, usually when taking SELinux state from disabled to enable (permissive or enforcing).
Story Points:	---
Clone Of:
Environment:
Last Closed:	2018-03-02 11:30:12 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2018:0913	None	None	None	2018-04-10 04:34 EDT

Groups: None (edit)

Description Richard Maciel Costa 2018-02-28 09:44:16 EST

policycoreutils was found to be vulnerable to a symlink attack that allows an local user to change the SELinux context of arbitrary files. This issue only occurs at relabeling time, through symlinks present in the /tmp and /var/tmp directories.

Comment 1 Richard Maciel Costa 2018-02-28 09:44:19 EST

Mitigation:

Remove any symbolic links from /tmp and /var/tmp directories before relabeling the file system.

Comment 6 Richard Maciel Costa 2018-03-01 10:09:30 EST

Acknowledgments:

Name: Renaud Métrich (Red Hat)

Comment 10 errata-xmlrpc 2018-04-10 04:34:30 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0913 https://access.redhat.com/errata/RHSA-2018:0913

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