Bugzilla Bug 149266

from the dokuwiki ml:

Another two vulnerabilities have been discovered in DokuWiki. Both are
mostly harmful for users of ImageMagick's convert utility only, but
should be quickly fixed by everyone.


The first one is a possible denial of service vulnerability caused by
allowing images being resized unlimited. When libGD is used (default)
the needed RAM is calculated before and the function aborts if not
enough RAM for the PHP process is available (typically 8 to 32MB).
However if ImageMagick ($conf['imconvert']) is used, no such limit
exists, allowing an attacker to potentially consume a lot of system
ressources.

More info and how to fix this is available at
http://bugs.splitbrain.org/?do=details&id=924


While examining this problem I discovered another, more serious one.
The input parameters for width and height are not sanitized properly,
which can be used by an attacker to introduce arbitrary shell commands
into the imagemagick commandline. I was not able exploit this with the
default libGD option but all users should apply the fix as soon as
possible anyway.

More info and how to fix this is available at
http://bugs.splitbrain.org/?do=details&id=926



Both problems are fixed in the new hotfixed tarball available at
http://www.splitbrain.org/go/dokuwiki

Committed dokuwiki-20060309e into cvs. I don't have a good place to test this
since I'm in the middle of moving, so can someone please test the app once you
install it? Thanks.

rating B1, it appears not to be vulnerable by default though (not using
imagemagick by default)

x86, pls test and mark stable if possible

and i'd have rated C1 since dokuwiki is not a widely-deployed package... but
nevermind

> rating B1, it appears not to be vulnerable by default though (not using
> imagemagick by default)

Yup, default is GD.

1) emerges fine
2) passes collision test
3) seems to work
Portage 2.1.1 (default-linux/x86/2006.1/desktop, gcc-4.1.1, glibc-2.4-r3,
2.6.17-gentoo-r8 i686)
=================================================================
System uname: 2.6.17-gentoo-r8 i686 AMD Athlon(tm) XP 2500+
Gentoo Base System version 1.12.5
Last Sync: Thu, 28 Sep 2006 05:20:01 +0000
app-admin/eselect-compiler: [Not Present]
dev-java/java-config: 1.2.11-r1
dev-lang/python:     2.4.3-r4
dev-python/pycrypto: 2.0.1-r5
dev-util/ccache:     [Not Present]
dev-util/confcache:  [Not Present]
sys-apps/sandbox:    1.2.17
sys-devel/autoconf:  2.13, 2.59-r7
sys-devel/automake:  1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2
sys-devel/binutils:  2.16.1-r3
sys-devel/gcc-config: 1.3.13-r3
sys-devel/libtool:   1.5.22
virtual/os-headers:  2.6.17-r1
ACCEPT_KEYWORDS="x86"
AUTOCLEAN="yes"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config
/usr/share/texmf/dvipdfm/config/ /usr/share/texmf/dvips/config/
/usr/share/texmf/tex/generic/config/ /usr/share/texmf/tex/platex/config/
/usr/share/texmf/xdvi/"
CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/revdep-rebuild /etc/splash
/etc/terminfo"
CXXFLAGS="-O2"
DISTDIR="/usr/portage/distfiles"
FEATURES="autoconfig ccache collision-protect distlocks metadata-transfer
parallel-fetch sandbox sfperms strict test"
GENTOO_MIRRORS="ftp://sunsite.informatik.rwth-aachen.de/pub/Linux/gentoo/"
LANG="de_DE@euro"
LC_ALL="de_DE@euro"
LINGUAS="de"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --delete-after --stats --timeout=180
--exclude='/distfiles' --exclude='/local' --exclude='/packages'"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.informatik.rwth-aachen.de/gentoo-portage"
USE="x86 3dnow 3dnowext X Xaw3d a52 alsa artworkextra asf audiofile
bash-completion beagle berkdb bidi bitmap-fonts bootsplash branding bzip2 cairo
cdda cddb cdparanoia cdr cli cracklib crypt css cups curl custom-cflags dbus
dga directfb divx4linux dlloader dri dts dvd dvdr dvdread dvi eds elibc_glibc
emacs emboss encode esd evo exif expat fam fat fbcon ffmpeg firefox fortran ftp
gb gcj gdbm gif gnome gpm gstreamer gtk gtk2 gtkhtml hal icq idn imagemagick
imap input_devices_keyboard input_devices_mouse ipv6 isdnlog java javascript
jikes jpeg jpeg2k kde kernel_linux ldap leim libg++ linguas_de lm_sensors mad
maildir matroska mbox mhash mikmod mime mmx mmxext mng mono mp3 mpeg mpeg2 mule
nautilus ncurses nforce2 nls nocardbus nptl nptlonly nsplugin nvidia objc ogg
opengl pam pcre pdf perl plotutils pmu png ppds pppd preview-latex print python
qt3 qt4 quicktime readline reflection reiserfs samba sdk session slang spell
spl sse ssl svg svga t1lib tcltk tcpd tetex theora thunderbird tiff truetype
truetype-fonts type1-fonts udev usb userland_GNU vcd video_cards_fbdev
video_cards_radeon video_cards_vesa videos vorbis win32codecs wmf wxwindows
xine xml xorg xosd xv xvid zlib"
Unset:  CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LDFLAGS,
PORTAGE_RSYNC_EXTRA_OPTS

x86 done

GLSA 200609-20

thanks everyone

adding CVE entries, sorry for the spam