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...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2018-1063
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1498774 1545726
TreeView+ depends on / blocked
 
Reported: 2018-02-28 14:44 UTC by Richard Maciel Costa
Modified: 2021-02-17 00:44 UTC (History)
11 users (show)

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).
Clone Of:
Environment:
Last Closed: 2018-03-02 16:30:12 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:0913 0 None None None 2018-04-10 08:34:38 UTC

Description Richard Maciel Costa 2018-02-28 14:44:16 UTC 
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 14:44:19 UTC 
Mitigation:

Remove any symbolic links from /tmp and /var/tmp directories before relabeling the file system.
Comment 6 Richard Maciel Costa 2018-03-01 15:09:30 UTC 
Acknowledgments:

Name: Renaud Métrich (Red Hat)
Comment 10 errata-xmlrpc 2018-04-10 08:34:30 UTC 
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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