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Category:   Application (Generic)  >   libarchive Vendors:   FreeBSD
libarchive Lets Remote Users Deny Service Via Specially Crafted Archives
SecurityTracker Alert ID:  1017199
SecurityTracker URL:  http://securitytracker.com/id/1017199
CVE Reference:   CVE-2006-5680   (Links to External Site)
Updated:  Nov 8 2006
Original Entry Date:  Nov 8 2006
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in libarchive. A remote user can cause denial of service conditions on the target system.

A remote user can create a specially crafted file that, when processed with an application that uses the library, will cause the library to enter an infinite loop.

When the library reaches the end of an archive while attempting to go past a region of the archive, libarchive will enter an infinite loop and stop reading data.

Rink Springer reported this vulnerability.

Impact:   A remote user can create an archive that, when processed by the target user or application, will cause denial of service conditions.
Solution:   FreeBSD has issued a fix and has provided the following solution information [quoted]:

Perform one of the following:

1) Upgrade your vulnerable system to 6-STABLE dated after the correction
date.

2) To patch your present system:

The following patches have been verified to apply to affected 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-06:24/libarchive.patch
# fetch http://security.FreeBSD.org/patches/SA-06:24/libarchive.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libarchive
# make obj && make depend && make && make install


The FreeBSD advisory is available at:

http://security.FreeBSD.org/advisories/FreeBSD-SA-06:24.libarchive.asc

Vendor URL:  security.FreeBSD.org/advisories/FreeBSD-SA-06:24.libarchive.asc (Links to External Site)
Cause:   State error
Underlying OS:  UNIX (FreeBSD)
Underlying OS Comments:  6.1 - 6.2

Message History:   None.


 Source Message Contents

Subject:  FreeBSD Security Advisory FreeBSD-SA-06:24.libarchive

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

=============================================================================
FreeBSD-SA-06:24.libarchive                                 Security Advisory
                                                          The FreeBSD Project

Topic:          Infinite loop in corrupt archives handling in libarchive(3)

Category:       core
Module:         libarchive
Announced:      2006-11-08
Credits:        Rink Springer
Affects:        FreeBSD 6-STABLE after 2006-09-05 05:23:51 UTC
Corrected:      2006-11-08 14:05:40 UTC (RELENG_6, 6.2-RC1)
CVE Name:       CVE-2006-5680

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

The libarchive library provides a flexible interface for reading and
writing streaming archive files such as tar and cpio, and has been the
basis for FreeBSD's implementation of the tar(1) utility since FreeBSD 5.3.

II.  Problem Description

If the end of an archive is reached while attempting to "skip" past a
region of an archive, libarchive will enter an infinite loop wherein it
repeatedly attempts (and fails) to read further data.

III. Impact

An attacker able to cause a system to extract (via "tar -x" or another
application which uses libarchive) or list the contents (via "tar -t" or
another libarchive-using application) of an archive provided by the
attacker can cause libarchive to enter an infinite loop and use all
available CPU time.

IV.  Workaround

No workaround is available.

V.   Solution

Perform one of the following:

1) Upgrade your vulnerable system to 6-STABLE dated after the correction
date.

2) To patch your present system:

The following patches have been verified to apply to affected 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-06:24/libarchive.patch
# fetch http://security.FreeBSD.org/patches/SA-06:24/libarchive.patch.asc

b) Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch
# cd /usr/src/lib/libarchive
# 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_6
  src/lib/libarchive/archive_read_support_compression_none.c      1.6.2.2
- -------------------------------------------------------------------------

VII. References

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5680

The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-06:24.libarchive.asc
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=SDvI
-----END PGP SIGNATURE-----
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