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UNIRAS Brief - 277/04 - FreeBSD-SA-04:12.jailroute:Jailed processes can manipulate host routing tables.



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 277/04 dated 08.06.04  Time: 12:15  
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

FreeBSD-SA-04:12.jailroute:Jailed processes can manipulate host routing tables.
                          

Detail
====== 

The jail(2) system call allows a system administrator to lock up a process and all
its descendants inside a closed environment with very limited ability to affect the
system outside that environment, even for processes with superuser privileges.  
It is an extension of, but far more stringent than, the traditional Unix chroot(2)
system call.




1.              ESB-2004.0388 -- FreeBSD-SA-04:12.jailroute
            Jailed processes can manipulate host routing tables
                               08 June 2004


Product:                jail
Publisher:              FreeBSD
Operating System:       FreeBSD 4.x releases prior to 4.10-RELEASE
Impact:                 Inappropriate Access
Access Required:        Existing Account
CVE Names:              CAN-2004-0125


=============================================================================
FreeBSD-SA-04:12.jailroute                                  Security Advisory
                                                          The FreeBSD Project

Topic:          Jailed processes can manipulate host routing tables

Category:       core
Module:         kernel
Announced:      2004-06-07
Credits:        Pawel Malachowski
Affects:        All FreeBSD 4.x releases prior to 4.10-RELEASE
Corrected:      2004-04-06 20:11:53 UTC (RELENG_4)
                2004-06-07 17:44:44 UTC (RELENG_4_9, 4.9-RELEASE-p10)
                2004-06-07 17:42:42 UTC (RELENG_4_8, 4.8-RELEASE-p23)
CVE Name:       CAN-2004-0125
FreeBSD only:   YES

For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://www.freebsd.org/security/>.

I.   Background

The jail(2) system call allows a system administrator to lock up a process and all its descendants inside a closed environment with very limited ability to affect the system outside that environment, even for processes with superuser privileges.  It is an extension of, but far more stringent than, the traditional Unix chroot(2) system call.

The FreeBSD kernel maintains internal routing tables for the purpose of determining which interface should be used to transmit packets. These routing tables can be manipulated by user processes running with superuser privileges by sending messages over a routing socket.

II.  Problem Description

A programming error resulting in a failure to verify that an attempt to manipulate routing tables originated from a non-jailed process.

III. Impact

Jailed processes running with superuser privileges could modify host routing tables.  This could result in a variety of consequences including packets being sent via an incorrect network interface and packets being discarded entirely.

IV.  Workaround

No workaround is available.

V.   Solution

Do one of the following:

1) Upgrade your vulnerable system to 4.10-RELEASE, or to the RELENG_4_8 or RELENG_4_9 security branch dated after the correction date.

OR

2) Patch your present system:

The following patch has been verified to apply to the FreeBSD 4.8 and 4.9 systems.

a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.

# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:12/jailroute.patch
# fetch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-04:12/jailroute.patch.asc

b) Apply the patch.

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in <URL:http://www.freebsd.org/handbook/kernelconfig.html> and reboot the system.

VI.  Correction details

The following list contains the revision numbers of each file that was corrected in FreeBSD.

Branch                                                           Revision
  Path
- - - -------------------------------------------------------------------------
RELENG_4
  src/sys/net/rtsock.c                                          1.44.2.13
RELENG_4_9
  src/UPDATING                                             1.73.2.89.2.11
  src/sys/conf/newvers.sh                                  1.44.2.32.2.11
  src/sys/net/rtsock.c                                      1.44.2.11.4.1
RELENG_4_8
  src/UPDATING                                             1.73.2.80.2.26
  src/sys/conf/newvers.sh                                  1.44.2.29.2.24
  src/sys/net/rtsock.c                                      1.44.2.11.2.1
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UNIRAS wishes to acknowledge the contributions of FreeBSD for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
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<End of UNIRAS Briefing>

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