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Home » Security Advisories» NetBSD » NetBSD 2003-008: integer overflow in xdrmem_getbytes

NetBSD 2003-008: integer overflow in xdrmem_getbytes

The xdrmem XDR stream object does incorrect bounds-checking. If the bounds-checking error is exploited, it may be possible for an attacker to send maliciously formatted messages.

  • Vendor: NetBSD
  • Vendor ID: 2003-008
  • Date: March 26, 2003


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NetBSD Security Advisory 2003-008
=================================

Topic:
Be sure to restart running instances of programs that use the libc rpc
library after upgrading.

If you have any statically-linked binaries that linked against a
vulnerable libc and uses rpc, you need to recompile them.


* NetBSD-current:

Systems running NetBSD-current dated from before 2003-03-20
should be upgraded to NetBSD-current dated 2003-03-20 or later.

The following file needs to be updated from the
netbsd-current CVS branch (aka HEAD):
lib/libc/rpc

To update from CVS, re-build, and re-install libc:
# cd src
# cvs update -d -P lib/libc/rpc
# cd lib/libc
# make USETOOLS=no cleandir dependall includes
# make USETOOLS=no install


* NetBSD 1.6:

The binary distribution of NetBSD 1.6 is vulnerable.

If a source-based point upgrade is required, sources from the
NetBSD 1.6 branch dated 2003-03-xx or later should be used.

The following file needs to be updated from the
netbsd-1-6 CVS branch:
lib/libc/rpc

To update from CVS, re-build, and re-install libc:
# cd src
# cvs update -d -P -r netbsd-1-6 lib/libc/rpc
# cd lib/libc
# make USETOOLS=no cleandir dependall includes
# make USETOOLS=no install


* NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:

The binary distribution of NetBSD 1.5.3 is vulnerable.

Systems running NetBSD-1.5.x dated from before 2003-03-xx
should be upgraded to NetBSD-1.5 branch dated 2003-03-xx or later.

The following file needs to be updated from the
Version: NetBSD-current: source prior to March 21, 2003
NetBSD-1.6.1: not affected
NetBSD-1.6: affected
NetBSD-1.5.3: affected
NetBSD-1.5.2: affected
NetBSD-1.5.1: affected
NetBSD-1.5: affected
NetBSD-1.4*: affected

Severity: buffer overrun

Fixed: NetBSD-current: March 21, 2003
NetBSD-1.6 branch: March 21, 2003
NetBSD-1.5 branch: not yet


Abstract
========

The xdrmem_*() routines in libc are susceptible to integer overflows,
that affect memory allocation in their local buffers. Processes
that use these functions may be coerced to execute code, or to
return private memory of the vulnerable process to the caller.


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

These URLs also describe another set of vulnerabilities which did not
affect NetBSD due to strong data typing changes made many years ago.

The relevant problem is described in the following URLs:

http://www.cert.org/advisories/CA-2003-10.html
http://www.securityfocus.com/archive/1/315641
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-003-xdr.txt


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

The following instructions describe how to upgrade your libc
binaries by updating your source tree and rebuilding and installing
a new version of libc.
The following file needs to be updated from the
netbsd-1-5 CVS branch:
lib/libc/rpc

To update from CVS, re-build, and re-install libc:
# cd src
# cvs update -d -P -r netbsd-1-5 lib/libc/rpc
# cd lib/libc
# make cleandir dependall includes
# make install


Thanks To
=========

eEye and CERT for notification.

Christos Zoulas for patches.


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

2003-03-26 Initial release

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

An up-to-date PGP signed copy of this release will be maintained at
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2003-008.txt.asc

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


Copyright 2003, The NetBSD Foundation, Inc. All Rights Reserved.

$NetBSD: NetBSD-SA2003-008.txt,v 1.5 2003/03/26 06:03:30 david Exp $

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