SecurityTracker.com
    Home    |    View Topics    |    Search    |    Contact Us    |   

SecurityTracker
Archives


 


Category:   Application (Generic)  >   Tcpdump Vendors:   Tcpdump.org
(FreeBSD Issues Fix) Tcpdump Buffer Overflow in 'print-bgp.c' Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1018499
SecurityTracker URL:  http://securitytracker.com/id/1018499
CVE Reference:   CVE-2007-3798   (Links to External Site)
Date:  Aug 2 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Tcpdump. A remote user can execute arbitrary code on the target system.

A remote user can send specially crafted BGP data to trigger a buffer overflow and execute arbitrary code on the target system. The code will run with the privileges of the target service.

The vulnerability resides in 'print-bgp.c'.

mu-b reported this vulnerability.

A demonstration exploit is available at:

http://www.digit-labs.org/files/exploits/private/tcpdump-bgp.c

Impact:   A remote user can execute arbitrary code on the target system.
Solution:   FreeBSD has provided the following solution instructions [quoted]:

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

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

# fetch http://security.FreeBSD.org/patches/SA-07:06/tcpdump.patch
# fetch http://security.FreeBSD.org/patches/SA-07:06/tcpdump.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/tcpdump/tcpdump
# make obj && make depend && make && make install

The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-07:06.tcpdump.asc

Vendor URL:  www.tcpdump.org/ (Links to External Site)
Cause:   Boundary error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  6.2 and prior versions

Message History:   This archive entry is a follow-up to the message listed below.
Jul 19 2007 Tcpdump Buffer Overflow in 'print-bgp.c' Lets Remote Users Execute Arbitrary Code



 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-07:06.tcpdump


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=============================================================================
FreeBSD-SA-07:06.tcpdump                                    Security Advisory
                                                          The FreeBSD Project

Topic:          Buffer overflow in tcpdump(1)

Category:       contrib
Module:         tcpdump
Announced:      2007-08-01
Credits:        "mu-b"
Affects:        All supported versions of FreeBSD
Corrected:      2007-08-01 20:42:48 UTC (RELENG_6, 6.2-STABLE)
                2007-08-01 20:44:58 UTC (RELENG_6_2, 6.2-RELEASE-p7)
                2007-08-01 20:45:49 UTC (RELENG_6_1, 6.1-RELEASE-p19)
                2007-08-01 20:47:13 UTC (RELENG_5, 5.5-STABLE)
                2007-08-01 20:48:19 UTC (RELENG_5_5, 5.5-RELEASE-p15)
CVE Name:       CVE-2007-3798

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

I.   Background

Tcpdump is a commonly used network diagnostic utility which decodes packets
received on the wire into human readable format.

II.  Problem Description

An un-checked return value in the BGP dissector code can result in an integer
overflow.  This value is used in subsequent buffer management operations,
resulting in a stack based buffer overflow under certain circumstances.

III. Impact

By crafting malicious BGP packets, an attacker could exploit this vulnerability
to execute code or crash the tcpdump process on the target system.  This
code would be executed in the context of the user running tcpdump(1).
It should be noted that tcpdump(1) requires privileges in order to open live
network interfaces.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 5-STABLE, or 6-STABLE, or to the
RELENG_6_2, RELENG_6_1, or RELENG_5_5 security branch dated after the
correction date.

2) To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5, 6.1,
and 6.2 systems.

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

# fetch http://security.FreeBSD.org/patches/SA-07:06/tcpdump.patch
# fetch http://security.FreeBSD.org/patches/SA-07:06/tcpdump.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/usr.sbin/tcpdump/tcpdump
# make obj && make depend && make && make install

VI.  Correction details

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

Branch                                                           Revision
  Path
- -------------------------------------------------------------------------
RELENG_5
  src/contrib/tcpdump/print-bgp.c                             1.1.1.5.2.2
RELENG_5_5
  src/UPDATING                                            1.342.2.35.2.15
  src/sys/conf/newvers.sh                                  1.62.2.21.2.17
  src/contrib/tcpdump/print-bgp.c                         1.1.1.5.2.1.2.1
RELENG_6
  src/contrib/tcpdump/print-bgp.c                             1.1.1.8.2.1
RELENG_6_2
  src/UPDATING                                            1.416.2.29.2.10
  src/sys/conf/newvers.sh                                  1.69.2.13.2.10
  src/contrib/tcpdump/print-bgp.c                             1.1.1.8.8.1
RELENG_6_1
  src/UPDATING                                            1.416.2.22.2.21
  src/sys/conf/newvers.sh                                  1.69.2.11.2.21
  src/contrib/tcpdump/print-bgp.c                             1.1.1.8.6.1
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3798

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-07:06.tcpdump.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.7 (FreeBSD)

iD8DBQFGsPfwFdaIBMps37IRAmK/AJ0adsy8zlOOXaJhJJdcX6A0Uy+bSQCfQYVi
4qk7MNSrKFZotejLEXKMCYI=
=JIZh
-----END PGP SIGNATURE-----
_______________________________________________
freebsd-security@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security
To unsubscribe, send any mail to "freebsd-security-unsubscribe@freebsd.org"

 
 


Go to the Top of This SecurityTracker Archive Page





Home   |    View Topics   |    Search   |    Contact Us

This web site uses cookies for web analytics. Learn More

Copyright 2020, SecurityGlobal.net LLC