NetBSD Security Advisory 2008-001: file(1) Integer overflow

[NetBSD Security-Officer <security-officer%netbsd.org@localhost>]

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                 NetBSD Security Advisory 2008-001
                 =================================

Topic:          file(1) Integer overflow

Version:        NetBSD-current:         affected
                NetBSD 4.0:             not affected
                NetBSD 3.1.1:           not affected
                NetBSD 3.1              affected
                NetBSD 3.0:             affected
                NetBSD 3.0.3:           not affected
                NetBSD 3.0.2:           affected
                NetBSD 3.0.1:           affected
                NetBSD 3.0:             affected
                NetBSD 2.1              affected
                NetBSD 2.0.*            affected

Severity:       Local code execution

Fixed:          NetBSD-current:         June 7, 2007
                NetBSD-3-1 branch:      June 24, 2007
                NetBSD-3-0 branch:      June 24, 2007
                NetBSD-3 branch:        June 24, 2007
                        (3.2 will include the fix)
                pkgsrc:                 file-4.2.1 corrects the issue


Abstract
========

An integer underflow was initially fixed in file 4.20 and soon after, a 
new integer overflow was identified in the original fix. To address the 
latest issue file 4.21 was release.  Either of these issues could result 
in local code execution if using file(1) on a maliciously crafted file.

This vulnerability has been assigned CVE reference CVE-2007-1536 for the 
initial issue and CVE-2007-2799 for the issue in the initial fix.


Technical Details
=================

An integer underflow was found in file_printf() which can lead to an
exploitable heap overflow.  The initial fix for this issue was found
to introduce an integer overflow which could again lead to code execution.
An updated patch was released as a part of file(1) 4.21.


Solutions and Workarounds
=========================

It is recommended that NetBSD users of vulnerable versions update
their binaries.

The following instructions describe how to upgrade your file(1)
binaries by updating your source tree and rebuilding and
installing a new version of file(1).

* NetBSD-current:

        Systems running NetBSD-current dated from before 2007-06-07
        should be upgraded to NetBSD-current dated 2007-06-08 or later.

        The following files/directories need to be updated from the
        netbsd-current CVS branch (aka HEAD):
                dist/file
                distrib/sets/lists/base/shl.elf
                distrib/sets/lists/base/shl.mi
                lib/Makefile
                lib/libmagic/Makefile
                lib/libmagic/config.h
                lib/libmagic/shlib_version
                tools/file/Makefile
                usr.bin/file/Makefile

        To update from CVS, re-build, and re-install file:

                # cd src
                # cvs update -d -P dist/file
                # cvs update -r distrib/sets/lists/base/shl.elf \
                        distrib/sets/lists/base/shl.mi \
                        lib/Makefile \
                        lib/libmagic/Makefile \
                        lib/libmagic/config.h \
                        lib/libmagic/shlib_version \
                        tools/file/Makefile \
                        usr.bin/file/Makefile
                # cd usr.bin/file
                # make USETOOLS=no cleandir dependall
                # make USETOOLS=no install

* NetBSD 3.*:

        Systems running NetBSD 3.* sources dated from before
        2007-06-24 should be upgraded from NetBSD 3.* sources dated
        2007-06-25 or later.

        The following files/directories need to be updated from the
        netbsd-3, netbsd-3-0 or netbsd-3-1 branches:
                dist/file
                distrib/sets/lists/base/shl.elf
                distrib/sets/lists/base/shl.mi
                lib/Makefile
                lib/libmagic/Makefile
                lib/libmagic/config.h
                lib/libmagic/shlib_version
                tools/file/Makefile
                usr.bin/file/Makefile

        To update from CVS, re-build, and re-install file:

                # cd src
                # cvs update -d -P dist/file
                # cvs update -r distrib/sets/lists/base/shl.elf \
                        distrib/sets/lists/base/shl.mi \
                        lib/Makefile \
                        lib/libmagic/Makefile \
                        lib/libmagic/config.h \
                        lib/libmagic/shlib_version \
                        tools/file/Makefile \
                        usr.bin/file/Makefile
                # cd usr.bin/file
                # make USETOOLS=no cleandir dependall
                # make USETOOLS=no install


Thanks To
=========

Christos Zoulas and Antti Kantee for patches, importing fixes and testing.


Revision History
================

        2008-02-28      Initial release


More Information
================

Advisories may be updated as new information becomes available.
The most recent version of this advisory (PGP signed) can be found at 
  ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2008-001.txt.asc

Information about NetBSD and NetBSD security can be found at
http://www.NetBSD.org/ and http://www.NetBSD.org/Security/.


Copyright 2008, The NetBSD Foundation, Inc.  All Rights Reserved.
Redistribution permitted only in full, unmodified form.

$NetBSD: NetBSD-SA2008-001.txt,v 1.3 2008/02/28 19:27:42 adrianp Exp $

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