Synopsis

Low: autofs security, bug fix, and enhancement update

Type/Severity

Security Advisory: Low

Topic

An updated autofs package that fixes one security issue, several bugs, and
adds one enhancement is now available for Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having low
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.

Description

The autofs utility controls the operation of the automount daemon. The
automount daemon automatically mounts and unmounts file systems.

A bug fix included in RHBA-2012:0264 introduced a denial of service flaw in
autofs. When using autofs with LDAP, a local user could use this flaw to
crash autofs, preventing future mount requests from being processed until
the autofs service was restarted. Note: This flaw did not impact existing
mounts (except for preventing mount expiration). (CVE-2012-2697)

Red Hat would like to thank Ray Rocker for reporting this issue.

This update also fixes the following bugs:

• The autofs init script sometimes timed out waiting for the automount
  daemon to exit and returned a shutdown failure if the daemon failed to exit
  in time. To resolve this problem, the amount of time that the init script
  waits for the daemon has been increased to allow for cases where servers
  are slow to respond or there are many active mounts. (BZ#585058)
  
• Due to an omission when backporting a change, autofs attempted to
  download the entire LDAP map at startup. This mistake has now been
  corrected. (BZ#767428)
  
• A function to check the validity of a mount location was meant to check
  only for a small subset of map location errors. A recent modification in
  error reporting inverted a logic test in this validating function.
  Consequently, the scope of the test was widened, which caused the automount
  daemon to report false positive failures. With this update, the faulty
  logic test has been corrected and false positive failures no longer occur.
  (BZ#798448)
  
• When there were many attempts to access invalid or non-existent keys, the
  automount daemon used excessive CPU resources. As a consequence, systems
  sometimes became unresponsive. The code has been improved so that automount
  checks for invalid keys earlier in the process which has eliminated a
  significant amount of the processing overhead. (BZ#847101)
  
• The auto.master(5) man page did not document the "-t, --timeout" option
  in the FORMAT options section. This update adds this information to the man
  page. (BZ#859890)
  

This update also adds the following enhancement:

• Previously, it was not possible to configure separate timeout values for
  individual direct map entries in the autofs master map. This update adds
  this functionality. (BZ#690404)
  

All users of autofs are advised to upgrade to this updated package, which
contains backported patches to correct these issues and add this
enhancement.

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/knowledge/articles/11258

Affected Products

• Red Hat Enterprise Linux Server 5 x86_64
• Red Hat Enterprise Linux Server 5 ia64
• Red Hat Enterprise Linux Server 5 i386
• Red Hat Enterprise Linux Workstation 5 x86_64
• Red Hat Enterprise Linux Workstation 5 i386
• Red Hat Enterprise Linux Desktop 5 x86_64
• Red Hat Enterprise Linux Desktop 5 i386
• Red Hat Enterprise Linux for IBM z Systems 5 s390x
• Red Hat Enterprise Linux for Power, big endian 5 ppc
• Red Hat Enterprise Linux Server from RHUI 5 x86_64
• Red Hat Enterprise Linux Server from RHUI 5 i386

Fixes

• BZ - 585058 - autofs5 init script times out before automount exits and incorrectly shows that autofs5 stop failed
• BZ - 643142 - "/net -hosts -fstype=nfs4" does not work while "/home /etc/auto.nfs4" works.
• BZ - 690404 - RFE: timeout option cannot be configured individually with multiple direct map entries
• BZ - 831772 - CVE-2012-2697 autofs: denial of service when using an LDAP-based automount map

CVEs

• CVE-2012-2697

References

• https://access.redhat.com/security/updates/classification/#low
• https://rhn.redhat.com/errata/RHBA-2012-0264.html

Red Hat Enterprise Linux Server 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
x86_64
autofs-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: f2745a829836a43d28ab12e227f0c2b5abedf5cd263191c0367408da4defcd63
autofs-debuginfo-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: 2d73e158124ce3431d6feb4f501d10819d6be3dca885c2df5458cc7e85c97f62
ia64
autofs-5.0.1-0.rc2.177.el5.ia64.rpm	SHA-256: bbead4a933c2506a5d40f6913c47e57cb99b2ff54c417c61faa948e0b07b10be
autofs-debuginfo-5.0.1-0.rc2.177.el5.ia64.rpm	SHA-256: 3ab7b2913eb99a4350a508dfc723210de853f069b382dc7a73a261bab65e0226
i386
autofs-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 4655b2123d235aff45611a76365d106e6ab4cd12f177a396d2dcd99394a8c9e1
autofs-debuginfo-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 9be7492184908ca7ded7d0f58abd6595c73f40e359c451b58e683749103c1f31

Red Hat Enterprise Linux Workstation 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
x86_64
autofs-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: f2745a829836a43d28ab12e227f0c2b5abedf5cd263191c0367408da4defcd63
autofs-debuginfo-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: 2d73e158124ce3431d6feb4f501d10819d6be3dca885c2df5458cc7e85c97f62
i386
autofs-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 4655b2123d235aff45611a76365d106e6ab4cd12f177a396d2dcd99394a8c9e1
autofs-debuginfo-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 9be7492184908ca7ded7d0f58abd6595c73f40e359c451b58e683749103c1f31

Red Hat Enterprise Linux Desktop 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
x86_64
autofs-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: f2745a829836a43d28ab12e227f0c2b5abedf5cd263191c0367408da4defcd63
autofs-debuginfo-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: 2d73e158124ce3431d6feb4f501d10819d6be3dca885c2df5458cc7e85c97f62
i386
autofs-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 4655b2123d235aff45611a76365d106e6ab4cd12f177a396d2dcd99394a8c9e1
autofs-debuginfo-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 9be7492184908ca7ded7d0f58abd6595c73f40e359c451b58e683749103c1f31

Red Hat Enterprise Linux for IBM z Systems 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
s390x
autofs-5.0.1-0.rc2.177.el5.s390x.rpm	SHA-256: 4ad4f7eb2f7cfdb9011cd6ae359411dc6b444e603d5504817421eea6e824bc61
autofs-debuginfo-5.0.1-0.rc2.177.el5.s390x.rpm	SHA-256: ac6110ae1b01f76562b40ebe2043588d7f4623c8446fc9cf53b9afc5f3827a03

Red Hat Enterprise Linux for Power, big endian 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
ppc
autofs-5.0.1-0.rc2.177.el5.ppc.rpm	SHA-256: 084ac5e0bb2282ad37b789b33e96ddec2435d1b89bb3d4332afa7d48c80f0a2d
autofs-debuginfo-5.0.1-0.rc2.177.el5.ppc.rpm	SHA-256: b85ca389bfed348de8c41c7abdf951f5e1f8ce70eaa3c245e6baf537bbf2bc6a

Red Hat Enterprise Linux Server from RHUI 5

SRPM
autofs-5.0.1-0.rc2.177.el5.src.rpm	SHA-256: 0f5e025728b575fafa7325110cdbb336c593a9488eecbc76a737499072538d74
x86_64
autofs-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: f2745a829836a43d28ab12e227f0c2b5abedf5cd263191c0367408da4defcd63
autofs-debuginfo-5.0.1-0.rc2.177.el5.x86_64.rpm	SHA-256: 2d73e158124ce3431d6feb4f501d10819d6be3dca885c2df5458cc7e85c97f62
i386
autofs-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 4655b2123d235aff45611a76365d106e6ab4cd12f177a396d2dcd99394a8c9e1
autofs-debuginfo-5.0.1-0.rc2.177.el5.i386.rpm	SHA-256: 9be7492184908ca7ded7d0f58abd6595c73f40e359c451b58e683749103c1f31