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| author | Alan Coopersmith <alan.coopersmith@oracle.com> | 2013-03-01 19:30:09 -0800 |
|---|---|---|
| committer | Ulrich Sibiller <uli42@gmx.de> | 2016-10-12 09:34:39 +0200 |
| commit | 2a1fbb1818bc56342e23e026004e0e7c4059cb6a (patch) | |
| tree | 7ecdc6e9e242618f6923bd97957cc71033f9603c | |
| parent | e03f3922a3d97174916273e369b2e9a90f53a05a (diff) | |
| download | nx-libs-2a1fbb1818bc56342e23e026004e0e7c4059cb6a.tar.gz nx-libs-2a1fbb1818bc56342e23e026004e0e7c4059cb6a.tar.bz2 nx-libs-2a1fbb1818bc56342e23e026004e0e7c4059cb6a.zip | |
unvalidated lengths in XAllocColorCells() [CVE-2013-1997 1/15]
If a broken server returned larger than requested values for nPixels or
nMasks, XAllocColorCells would happily overflow the buffers provided by
the caller to write the results into.
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Reviewed-by: Matthieu Herrb <matthieu.herrb@laas.fr>
Signed-off-by: Julien Cristau <jcristau@debian.org>
Backported-to-NX-by: Ulrich Sibiller <uli42@gmx.de>
| -rw-r--r-- | nx-X11/lib/X11/AllCells.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/nx-X11/lib/X11/AllCells.c b/nx-X11/lib/X11/AllCells.c index bbc977059..6d9548f0d 100644 --- a/nx-X11/lib/X11/AllCells.c +++ b/nx-X11/lib/X11/AllCells.c @@ -54,8 +54,13 @@ Status XAllocColorCells( status = _XReply(dpy, (xReply *)&rep, 0, xFalse); if (status) { - _XRead32 (dpy, (long *) pixels, 4L * (long) (rep.nPixels)); - _XRead32 (dpy, (long *) masks, 4L * (long) (rep.nMasks)); + if ((rep.nPixels > ncolors) || (rep.nMasks > nplanes)) { + _XEatDataWords(dpy, rep.length); + status = 0; /* Failure */ + } else { + _XRead32 (dpy, (long *) pixels, 4L * (long) (rep.nPixels)); + _XRead32 (dpy, (long *) masks, 4L * (long) (rep.nMasks)); + } } UnlockDisplay(dpy); |