[RHSA-2015:2417-01] Moderate: autofs security, bug fix and enhancement update

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Red Hat Security Advisory

 

Synopsis: Moderate: autofs security, bug fix and enhancement update

Advisory ID: RHSA-2015:2417-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2417.html

Issue date: 2015-11-19

CVE Names: CVE-2014-8169

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1. Summary:

 

Updated autofs packages that fix one security issue, several bugs, and add

one enhancement are now available for Red Hat Enterprise Linux 7.

 

Red Hat Product Security has rated this update as having Moderate security

impact. A Common Vulnerability Scoring System (CVSS) base score, which

gives a detailed severity rating, is available from the CVE link in the

References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux Client (v. 7) - x86_64

Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64

Red Hat Enterprise Linux Server (v. 7) - aarch64, ppc64, ppc64le, s390x, x86_64

Red Hat Enterprise Linux Workstation (v. 7) - x86_64

 

3. Description:

 

The autofs utility controls the operation of the automount daemon. The

daemon automatically mounts file systems when in use and unmounts them when

they are not busy.

 

It was found that program-based automounter maps that used interpreted

languages such as Python used standard environment variables to locate

and load modules of those languages. A local attacker could potentially use

this flaw to escalate their privileges on the system. (CVE-2014-8169)

 

Note: This issue has been fixed by adding the "AUTOFS_" prefix to the

affected environment variables so that they are not used to subvert the

system. A configuration option ("force_standard_program_map_env") to

override this prefix and to use the environment variables without the

prefix has been added. In addition, warnings have been added to the manual

page and to the installed configuration file. Now, by default the standard

variables of the program map are provided only with the prefix added to

its name.

 

Red Hat would like to thank the Georgia Institute of Technology for

reporting this issue.

 

Notably, this update fixes the following bugs:

 

* When the "ls *" command was run in the root of an indirect mount, autofs

attempted to literally mount the wildcard character (*) causing it to be

added to the negative cache. If done before a valid mount, autofs then

failed on further mount attempts inside the mount point, valid or not. This

has been fixed, and wildcard map entries now function in the described

situation. (BZ#1166457)

 

* When autofs encountered a syntax error consisting of a duplicate entry in

a multimap entry, it reported an error and did not mount the map entry.

With this update, autofs has been amended to report the problem in the log

to alert the system administrator and use the last seen instance of the

duplicate entry rather than fail. (BZ#1205600)

 

* In the ldap and sss lookup modules, the map reading functions did not

distinguish between the "no entry found" and "service not available"

errors. Consequently, when the "service not available" response was

returned from a master map read, autofs did not update the mounts.

An "entry not found" return does not prevent the map update, so the ldap

and sss lookup modules were updated to distinguish between these two

returns and now work as expected. (BZ#1233065)

 

In addition, this update adds the following enhancement:

 

* The description of the configuration parameter map_hash_table_size was

missing from the autofs.conf(5) man page and its description in the

configuration file comments was insufficient. A description of the

parameter has been added to autofs.conf(5), and the configuration file

comments have been updated. (BZ#1238573)

 

All autofs users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues and add this

enhancement.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

For details on how to apply this update, refer to:

 

https://access.redhat.com/articles/11258

 

5. Bugs fixed (https://bugzilla.redhat.com/):

 

1161474 - automount segment fault in parse_sun.so for negative parser tests

1166457 - Autofs unable to mount indirect after attempt to mount wildcard

1192565 - CVE-2014-8169 autofs: priv escalation via interpreter load path for program based automount maps

1201582 - autofs: MAPFMT_DEFAULT is not macro in lookup_program.c

1218045 - Similar but unrelated NFS exports block proper mounting of "parent" mount point

1233067 - autofs is performing excessive direct mount map re-reads

1233069 - Direct map does not expire if map is initially empty

1263508 - Heavy program map usage can lead to a hang

 

6. Package List:

 

Red Hat Enterprise Linux Client (v. 7):

 

Source:

autofs-5.0.7-54.el7.src.rpm

 

x86_64:

autofs-5.0.7-54.el7.x86_64.rpm

autofs-debuginfo-5.0.7-54.el7.x86_64.rpm

 

Red Hat Enterprise Linux ComputeNode (v. 7):

 

Source:

autofs-5.0.7-54.el7.src.rpm

 

x86_64:

autofs-5.0.7-54.el7.x86_64.rpm

autofs-debuginfo-5.0.7-54.el7.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 7):

 

Source:

autofs-5.0.7-54.el7.src.rpm

 

aarch64:

autofs-5.0.7-54.el7.aarch64.rpm

autofs-debuginfo-5.0.7-54.el7.aarch64.rpm

 

ppc64:

autofs-5.0.7-54.el7.ppc64.rpm

autofs-debuginfo-5.0.7-54.el7.ppc64.rpm

 

ppc64le:

autofs-5.0.7-54.el7.ppc64le.rpm

autofs-debuginfo-5.0.7-54.el7.ppc64le.rpm

 

s390x:

autofs-5.0.7-54.el7.s390x.rpm

autofs-debuginfo-5.0.7-54.el7.s390x.rpm

 

x86_64:

autofs-5.0.7-54.el7.x86_64.rpm

autofs-debuginfo-5.0.7-54.el7.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 7):

 

Source:

autofs-5.0.7-54.el7.src.rpm

 

x86_64:

autofs-5.0.7-54.el7.x86_64.rpm

autofs-debuginfo-5.0.7-54.el7.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/

 

7. References:

 

https://access.redhat.com/security/cve/CVE-2014-8169

https://access.redhat.com/security/updates/classification/#moderate

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2015 Red Hat, Inc.

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