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authorAlan Coopersmith <alan.coopersmith@oracle.com>2013-03-01 19:30:09 -0800
committerUlrich Sibiller <uli42@gmx.de>2016-10-12 09:34:39 +0200
commit2a1fbb1818bc56342e23e026004e0e7c4059cb6a (patch)
tree7ecdc6e9e242618f6923bd97957cc71033f9603c /nx-X11
parente03f3922a3d97174916273e369b2e9a90f53a05a (diff)
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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>
Diffstat (limited to 'nx-X11')
-rw-r--r--nx-X11/lib/X11/AllCells.c9
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);