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Red Hat Enterprise Linux: Important Local Exploit Found in Policycoreutils

red hat
Calendar Grey April 4, 2011
Dist Redhat Esm H88
Attention Red Hat users: a significant update has been released for policycoreutils addressing a serious permissions vulnerability that could impact local user security.
Updated policycoreutils packages that fix one security issue are now available for Red Hat Enterprise Linux 6

Solution

Before applying this update, make sure all previously-released errata relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to use the Red Hat Network to apply this update are available at https://access.redhat.com/kb/docs/DOC-11259

Summary

The policycoreutils packages contain the core utilities that are required for the basic operation of a Security-Enhanced Linux (SELinux) system and its policies.
It was discovered that the seunshare utility did not enforce proper file permissions on the directory used as an alternate temporary directory mounted as /tmp/. A local user could use this flaw to overwrite files or, possibly, execute arbitrary code with the privileges of a setuid or setgid application that relies on proper /tmp/ permissions, by running that application via seunshare. (CVE-2011-1011)
Red Hat would like to thank Tavis Ormandy for reporting this issue.
This update also introduces the following changes:
* The seunshare utility was moved from the main policycoreutils subpackage to the policycoreutils-sandbox subpackage. This utility is only required by the sandbox feature and does not need to be installed by default.
* Updated selinux-policy packages that add the SELinux policy changes required by the seunshare fixes.
All policycoreutils users should upgrade to these updated packages, which correct this issue.

Topics%20covered

Topics Covered

security advisory security issue Red Hat Enterprise Linux local exploit important SELinux policycoreutils

References

https://access.redhat.com/security/cve/CVE-2011-1011 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Desktop (v. 6):
Source:
i386: policycoreutils-2.0.83-19.8.el6_0.i686.rpm policycoreutils-debuginfo-2.0.83-19.8.el6_0.i686.rpm policycoreutils-gui-2.0.83-19.8.el6_0.i686.rpm policycoreutils-newrole-2.0.83-19.8.el6_0.i686.rpm policycoreutils-python-2.0.83-19.8.el6_0.i686.rpm policycoreutils-sandbox-2.0.83-19.8.el6_0.i686.rpm
noarch: selinux-policy-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-minimum-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-mls-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-targeted-3.7.19-54.el6_0.5.noarch.rpm
x86_64: policycoreutils-2.0.83-19.8.el6_0.x86_64.rpm policycoreutils-debuginfo-2.0.83-19.8.el6_0.x86_64.rpm policycoreutils-gui-2.0.83-19.8.el6_0.x86_64.rpm policycoreutils-newrole-2.0.83-19.8.el6_0.x86_64.rpm policycoreutils-python-2.0.83-19.8.el6_0.x86_64.rpm policycoreutils-sandbox-2.0.83-19.8.el6_0.x86_64.rpm
Red Hat Enterprise Linux Desktop Optional (v. 6):
Source:
noarch: selinux-policy-doc-3.7.19-54.el6_0.5.noarch.rpm
Red Hat Enterprise Linux HPC Node (v. 6):
Source:
noarch: selinux-policy-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-minimum-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-mls-3.7.19-54.el6_0.5.noarch.rpm selinux-policy-targeted-3.7.19-54.el6_0.5.noarch.rpm
x86_64: policycoreutils-2.0.83-19.8.el6_0.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2011:0414-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2011:0414.html
Issue date: 2011-04-04

Topic

Updated policycoreutils packages that fix one security issue are nowavailable for Red Hat Enterprise Linux 6.The Red Hat Security Response Team has rated this update as havingimportant security impact. A Common Vulnerability Scoring System (CVSS)base score, which gives a detailed severity rating, is available from theCVE link in the References section.

Topics%20covered

Topics Covered

security advisory security issue Red Hat Enterprise Linux local exploit important SELinux policycoreutils

Relevant Releases Architectures

Red Hat Enterprise Linux Desktop (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Desktop Optional (v. 6) - noarch

Red Hat Enterprise Linux HPC Node (v. 6) - noarch, x86_64

Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, noarch, ppc64, s390x, x86_64

Red Hat Enterprise Linux Server Optional (v. 6) - noarch

Red Hat Enterprise Linux Workstation (v. 6) - i386, noarch, x86_64

Red Hat Enterprise Linux Workstation Optional (v. 6) - noarch

Bugs Fixed

633544 - CVE-2011-1011 policycoreutils: insecure temporary directory handling in seunshare

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