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                 NetBSD Security Advisory 2002-021
                 =================================

Topic: rogue vulnerability

Version: NetBSD-current: source prior to October 2, 2002
                NetBSD 1.6: affected
                NetBSD-1.5.3: affected
                NetBSD-1.5.2: affected
                NetBSD-1.5.1: affected
                NetBSD-1.5: affected

Severity: Local user can elevate privileges to group "games"

Fixed: NetBSD-current: October 2, 2002
                NetBSD-1.6 branch: October 3, 2002
                                        (1.6.1 will include the fix)
                NetBSD-1.5 branch: October 3, 2002

Abstract
========

There are several buffer overflows in the processing of saved games
when restarting rogue(6), that allow one to obtain group "games."

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

When rogue(6) saves a game for later, it writes a string length with
each string in the save file. When re-reading the file for continuing
the game, this value was used unbounded when reading the string,
allowing a hand-crafted save file to overflow a buffer.

All read operations from the save file are now correctly bounded.

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

The easiest solution to this problem is to simply remove the set-gid
bit from rogue(6):

        # chmod g-s /usr/games/rogue

This only impacts rogue's ability to save scores.

The following instructions describe how to upgrade your rogue(6)
binaries by updating your source tree and rebuilding and
installing a new version of rogue(6).

* NetBSD-current:

        Systems running NetBSD-current dated from before 2002-10-02
        should be upgraded to NetBSD-current dated 2002-10-02 or later.

        The following directories need to be updated from the
        netbsd-current CVS branch (aka HEAD):
                games/rogue

        To update from CVS, re-build, and re-install rogue(6):
                # cd src
                # cvs update -d -P games/rogue
                # cd games/rogue

                # make cleandir dependall
                # make install

* NetBSD 1.6:

        Systems running NetBSD 1.6 sources dated from before
        2002-10-03 should be upgraded from NetBSD 1.6 sources dated
        2002-10-03 or later.

        NetBSD 1.6.1 will include the fix.

        The following directories need to be updated from the
        netbsd-1-6 CVS branch:
                games/rogue

        To update from CVS, re-build, and re-install rogue(6):

                # cd src
                # cvs update -d -P -r netbsd-1-6 games/rogue
                # cd games/rogue

                # make cleandir dependall
                # make install

        Alternatively, apply the following patch (with potential offset
        differences):
                ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA20020-021-rogue.patch

        To patch, re-build and re-install rogue(6):

                # cd src/games/rogue
                # patch < /path/to/SA20020-021-rogue.patch

                # make cleandir dependall
                # make install

* NetBSD 1.5, 1.5.1, 1.5.2, 1.5.3:

        Systems running NetBSD 1.5, 1.5.1, 1.5.2, or 1.5.3 sources dated
        from before 2002-10-03 should be upgraded from NetBSD 1.5.*
        sources dated 2002-10-03 or later.

        The following directories need to be updated from the
        netbsd-1-5 CVS branch:
                games/rogue

        To update from CVS, re-build, and re-install rogue(6):

                # cd src
                # cvs update -d -P -r netbsd-1-5 games/rogue
                # cd games/rogue

                # make cleandir dependall
                # make install

        Alternatively, apply the following patch (with potential offset
        differences):
                ftp://ftp.netbsd.org/pub/NetBSD/security/patches/SA20020-021-rogue.patch

        To patch, re-build and re-install rogue(6):

                # cd src/games/rogue
                # patch < /path/to/SA20020-021-rogue.patch

                # make cleandir dependall
                # make install

Thanks To
=========

stanojr for reporting this problem, matthew green for providing a solution
and Simon Burge for helping test the solution.

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

        2002-10-08 Initial release

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

Advisories may be updated as new information comes to hand. The most
recent version of this advisory (PGP signed) can be found at
  ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2002-021.txt.asc

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

Copyright 2002, The NetBSD Foundation, Inc. All Rights Reserved.

$NetBSD: NetBSD-SA2002-021.txt,v 1.7 2002/10/08 03:43:35 itojun Exp $

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