RHEL 6 : autofs (RHSA-2015:1344)

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated autofs packages that fix one security issue and several bugs
are now available for Red Hat Enterprise Linux 6.

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.

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 would use 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.

Bug fixes :

* If the 'ls *' command was executed before a valid mount, the autofs
program failed on further mount attempts inside the mount point,
whether the mount point was valid or not. While attempting to mount,
the 'ls *' command of the root directory of an indirect mount was
executed, which led to an attempt to mount '*', causing it to be added
to the negative map entry cache. This bug has been fixed by checking
for and not adding '*' while updating the negative map entry cache.
(BZ#1163957)

* The autofs program by design did not mount host map entries that
were duplicate exports in an NFS server export list. The duplicate
entries in a multi-mount map entry were recognized as a syntax error
and autofs refused to perform mounts when the duplicate entries
occurred. Now, autofs has been changed to continue mounting the last
seen instance of the duplicate entry rather than fail, and to report
the problem in the log files to alert the system administrator.
(BZ#1124083)

* The autofs program did not recognize the yp map type in the master
map. This was caused by another change in the master map parser to fix
a problem with detecting the map format associated with mapping the
type in the master map. The change led to an incorrect length for the
type comparison of yp maps that resulted in a match operation failure.
This bug has been fixed by correcting the length which is used for the
comparison. (BZ#1153130)

* The autofs program did not update the export list of the Sun-format
maps of the network shares exported from an NFS server. This happened
due to a change of the Sun-format map parser leading to the hosts map
update to stop working on the map re-read operation. The bug has been
now fixed by selectively preventing this type of update only for the
Sun-formatted maps. The updates of the export list on the Sun-format
maps are now visible and refreshing of the export list is no longer
supported for the Sun-formatted hosts map. (BZ#1156387)

* Within changes made for adding of the Sun-format maps, an incorrect
check was added that caused a segmentation fault in the Sun-format map
parser in certain circumstances. This has been now fixed by analyzing
the intent of the incorrect check and changing it in order to properly
identify the conditions without causing a fault. (BZ#1175671)

* A bug in the autofs program map lookup module caused an incorrect
map format type comparison. The incorrect comparison affected the
Sun-format program maps where it led to the unused macro definitions.
The bug in the comparison has been fixed so that the macro definitions
are not present for the Sun-format program maps. (BZ#1201195)

Users of autofs are advised to upgrade to these updated packages,
which contain backported patches to correct these issues.

See also :

https://www.redhat.com/security/data/cve/CVE-2014-8169.html
http://rhn.redhat.com/errata/RHSA-2015-1344.html

Solution :

Update the affected autofs and / or autofs-debuginfo packages.

Risk factor :

Medium / CVSS Base Score : 4.4
(CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P)
CVSS Temporal Score : 3.7
(CVSS2#E:U/RL:U/RC:ND)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 84939 ()

Bugtraq ID: 73211

CVE ID: CVE-2014-8169

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