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authorAlan Coopersmith <alan.coopersmith@oracle.com>2013-03-02 11:04:44 -0800
committerUlrich Sibiller <uli42@gmx.de>2016-10-12 09:34:39 +0200
commite27df80700727725aea6c03986fa10e4ed0c6d65 (patch)
tree98819657f851a6d85e58020c2ae902312c1162cd /nx-X11/lib/X11
parent7564bf7efc93b87da7a512a0ba205c9d1d26ff36 (diff)
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unvalidated index in _XkbReadExplicitComponents() [CVE-2013-1997 9/15]
If the X server returns key indexes outside the range of the number of keys it told us to allocate, out of bounds memory writes could occur. 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/lib/X11')
-rw-r--r--nx-X11/lib/X11/XKBGetMap.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/nx-X11/lib/X11/XKBGetMap.c b/nx-X11/lib/X11/XKBGetMap.c
index 56f068dbf..5705f2649 100644
--- a/nx-X11/lib/X11/XKBGetMap.c
+++ b/nx-X11/lib/X11/XKBGetMap.c
@@ -363,8 +363,10 @@ register int i;
unsigned char *wire;
if ( rep->totalKeyExplicit>0 ) {
+ int size = xkb->max_key_code + 1;
+ if ( ((int) rep->firstKeyExplicit + rep->nKeyExplicit) > size)
+ return BadLength;
if ( xkb->server->explicit == NULL ) {
- int size = xkb->max_key_code+1;
xkb->server->explicit = _XkbTypedCalloc(size,unsigned char);
if (xkb->server->explicit==NULL)
return BadAlloc;
@@ -378,6 +380,8 @@ unsigned char *wire;
if (!wire)
return BadLength;
for (i=0;i<rep->totalKeyExplicit;i++,wire+=2) {
+ if (wire[0] > xkb->max_key_code || wire[1] > xkb->max_key_code)
+ return BadLength;
xkb->server->explicit[wire[0]]= wire[1];
}
}