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main/libxt: fix CVE-2013-2002,CVE-2013-2005

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ref #1931
This commit is contained in:
Natanael Copa 2013-05-24 09:55:00 +00:00
parent decef4fe3c
commit e6d9eccdf7
3 changed files with 282 additions and 8 deletions
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175
main/libxt/0001-Unchecked-return-values-of-XGetWindowProperty-CVE-20.patch Normal file
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@ -0,0 +1,175 @@
From eae57493feec958bcf733ad0d334715107029f8b Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sat, 9 Mar 2013 11:29:21 -0800
Subject: [PATCH 1/2] Unchecked return values of XGetWindowProperty
[CVE-2013-2005]
Multiple functions in Selection.c assumed that XGetWindowProperty() would
always set the pointer to the property, but before libX11 1.6, it could
fail to do so in some cases, leading to libXt freeing or operating on an
uninitialized pointer value, so libXt should always initialize the pointers
and check for failure itself.
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
src/Selection.c | 84 ++++++++++++++++++++++++++++++++-------------------------
1 file changed, 47 insertions(+), 37 deletions(-)
diff --git a/src/Selection.c b/src/Selection.c
index f35cb44..4f59d70 100644
--- a/src/Selection.c
+++ b/src/Selection.c
@@ -839,14 +839,16 @@ static void HandleSelectionEvents(
IndirectPair *p;
int format;
unsigned long bytesafter, length;
- unsigned char *value;
+ unsigned char *value = NULL;
ev.property = event->xselectionrequest.property;
StartProtectedSection(ev.display, ev.requestor);
- (void) XGetWindowProperty(ev.display, ev.requestor,
+ if (XGetWindowProperty(ev.display, ev.requestor,
event->xselectionrequest.property, 0L, 1000000,
False,(Atom)AnyPropertyType, &target, &format, &length,
- &bytesafter, &value);
- count = BYTELENGTH(length, format) / sizeof(IndirectPair);
+ &bytesafter, &value) == Success)
+ count = BYTELENGTH(length, format) / sizeof(IndirectPair);
+ else
+ count = 0;
for (p = (IndirectPair *)value; count; p++, count--) {
EndProtectedSection(ctx->dpy);
if (!GetConversion(ctx, (XSelectionRequestEvent*)event,
@@ -1053,9 +1055,10 @@ static Boolean IsINCRtype(
if (prop == None) return False;
- (void)XGetWindowProperty(XtDisplay(info->widget), window, prop, 0L, 0L,
- False, info->ctx->prop_list->incr_atom,
- &type, &format, &length, &bytesafter, &value);
+ if (XGetWindowProperty(XtDisplay(info->widget), window, prop, 0L, 0L,
+ False, info->ctx->prop_list->incr_atom, &type,
+ &format, &length, &bytesafter, &value) != Success)
+ return False;
return (type == info->ctx->prop_list->incr_atom);
}
@@ -1069,7 +1072,6 @@ static void ReqCleanup(
{
CallBackInfo info = (CallBackInfo)closure;
unsigned long bytesafter, length;
- char *value;
int format;
Atom target;
@@ -1093,17 +1095,19 @@ static void ReqCleanup(
(ev->xproperty.state == PropertyNewValue) &&
(ev->xproperty.atom == info->property)) {
XPropertyEvent *event = (XPropertyEvent *) ev;
- (void) XGetWindowProperty(event->display, XtWindow(widget),
- event->atom, 0L, 1000000, True, AnyPropertyType,
- &target, &format, &length, &bytesafter,
- (unsigned char **) &value);
- XFree(value);
- if (length == 0) {
- XtRemoveEventHandler(widget, (EventMask) PropertyChangeMask, FALSE,
- ReqCleanup, (XtPointer) info );
- FreeSelectionProperty(XtDisplay(widget), info->property);
- XtFree(info->value); /* requestor never got this, so free now */
- FreeInfo(info);
+ char *value = NULL;
+ if (XGetWindowProperty(event->display, XtWindow(widget),
+ event->atom, 0L, 1000000, True, AnyPropertyType,
+ &target, &format, &length, &bytesafter,
+ (unsigned char **) &value) == Success) {
+ XFree(value);
+ if (length == 0) {
+ XtRemoveEventHandler(widget, (EventMask) PropertyChangeMask,
+ FALSE, ReqCleanup, (XtPointer) info );
+ FreeSelectionProperty(XtDisplay(widget), info->property);
+ XtFree(info->value); /* requestor never got this, so free now */
+ FreeInfo(info);
+ }
}
}
}
@@ -1121,20 +1125,23 @@ static void ReqTimedOut(
unsigned long bytesafter;
unsigned long proplength;
Atom type;
- IndirectPair *pairs;
XtPointer *c;
int i;
if (*info->target == info->ctx->prop_list->indirect_atom) {
- (void) XGetWindowProperty(XtDisplay(info->widget),
- XtWindow(info->widget), info->property, 0L,
- 10000000, True, AnyPropertyType, &type, &format,
- &proplength, &bytesafter, (unsigned char **) &pairs);
- XFree((char*)pairs);
- for (proplength = proplength / IndirectPairWordSize, i = 0, c = info->req_closure;
- proplength; proplength--, c++, i++)
- (*info->callbacks[i])(info->widget, *c,
- &info->ctx->selection, &resulttype, value, &length, &format);
+ IndirectPair *pairs = NULL;
+ if (XGetWindowProperty(XtDisplay(info->widget), XtWindow(info->widget),
+ info->property, 0L, 10000000, True,
+ AnyPropertyType, &type, &format, &proplength,
+ &bytesafter, (unsigned char **) &pairs)
+ == Success) {
+ XFree(pairs);
+ for (proplength = proplength / IndirectPairWordSize, i = 0,
+ c = info->req_closure;
+ proplength; proplength--, c++, i++)
+ (*info->callbacks[i])(info->widget, *c, &info->ctx->selection,
+ &resulttype, value, &length, &format);
+ }
} else {
(*info->callbacks[0])(info->widget, *info->req_closure,
&info->ctx->selection, &resulttype, value, &length, &format);
@@ -1280,12 +1287,13 @@ Boolean HandleNormal(
unsigned long length;
int format;
Atom type;
- unsigned char *value;
+ unsigned char *value = NULL;
int number = info->current;
- (void) XGetWindowProperty(dpy, XtWindow(widget), property, 0L,
- 10000000, False, AnyPropertyType,
- &type, &format, &length, &bytesafter, &value);
+ if (XGetWindowProperty(dpy, XtWindow(widget), property, 0L, 10000000,
+ False, AnyPropertyType, &type, &format, &length,
+ &bytesafter, &value) != Success)
+ return FALSE;
if (type == info->ctx->prop_list->incr_atom) {
unsigned long size = IncrPropSize(widget, value, format, length);
@@ -1370,7 +1378,6 @@ static void HandleSelectionReplies(
Display *dpy = event->display;
CallBackInfo info = (CallBackInfo) closure;
Select ctx = info->ctx;
- IndirectPair *pairs, *p;
unsigned long bytesafter;
unsigned long length;
int format;
@@ -1385,9 +1392,12 @@ static void HandleSelectionReplies(
XtRemoveEventHandler(widget, (EventMask)0, TRUE,
HandleSelectionReplies, (XtPointer) info );
if (event->target == ctx->prop_list->indirect_atom) {
- (void) XGetWindowProperty(dpy, XtWindow(widget), info->property, 0L,
- 10000000, True, AnyPropertyType, &type, &format,
- &length, &bytesafter, (unsigned char **) &pairs);
+ IndirectPair *pairs = NULL, *p;
+ if (XGetWindowProperty(dpy, XtWindow(widget), info->property, 0L,
+ 10000000, True, AnyPropertyType, &type, &format,
+ &length, &bytesafter, (unsigned char **) &pairs)
+ != Success)
+ length = 0;
for (length = length / IndirectPairWordSize, p = pairs,
c = info->req_closure;
length; length--, p++, c++, info->current++) {
--
1.8.2.3

78
main/libxt/0002-unvalidated-length-in-_XtResourceConfigurationEH-CVE.patch Normal file
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@ -0,0 +1,78 @@
From 9264a21b688891dbdcee630ff72cf39aa75fc4e1 Mon Sep 17 00:00:00 2001
From: Alan Coopersmith <alan.coopersmith@oracle.com>
Date: Sat, 9 Mar 2013 11:44:14 -0800
Subject: [PATCH 2/2] unvalidated length in _XtResourceConfigurationEH
[CVE-2013-2002]
The RCM_DATA property is expected to be in the format:
resource_length, resource, value
If the property contains a resource_length thats results in a pointer
outside the property string, memory corruption can occur.
Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
---
src/ResConfig.c | 41 ++++++++++++++++++++++++++---------------
1 file changed, 26 insertions(+), 15 deletions(-)
diff --git a/src/ResConfig.c b/src/ResConfig.c
index 68da536..1f3edbe 100644
--- a/src/ResConfig.c
+++ b/src/ResConfig.c
@@ -971,26 +971,37 @@ _XtResourceConfigurationEH (
* resource and value fields.
*/
if (data) {
+ char *data_end = data + nitems;
+ char *data_value;
+
resource_len = Strtoul ((void *)data, &data_ptr, 10);
- data_ptr++;
- data_ptr[resource_len] = '\0';
+ if (data_ptr != (char *) data) {
+ data_ptr++;
+ data_value = data_ptr + resource_len;
+ } else /* strtoul failed to convert a number */
+ data_ptr = data_value = NULL;
+
+ if (data_value > data_ptr && data_value < data_end) {
+ *data_value++ = '\0';
- resource = XtNewString (data_ptr);
- value = XtNewString (&data_ptr[resource_len + 1]);
+ resource = XtNewString (data_ptr);
+ value = XtNewString (data_value);
#ifdef DEBUG
- fprintf (stderr, "resource_len=%d\n",resource_len);
- fprintf (stderr, "resource = %s\t value = %s\n",
- resource, value);
+ fprintf (stderr, "resource_len=%d\n"
+ resource_len);
+ fprintf (stderr, "resource = %s\t value = %s\n",
+ resource, value);
#endif
- /*
- * descend the application widget tree and
- * apply the value to the appropriate widgets
- */
- _search_widget_tree (w, resource, value);
-
- XtFree (resource);
- XtFree (value);
+ /*
+ * descend the application widget tree and
+ * apply the value to the appropriate widgets
+ */
+ _search_widget_tree (w, resource, value);
+
+ XtFree (resource);
+ XtFree (value);
+ }
}
}
--
1.8.2.3

37
main/libxt/APKBUILD
View File

@ -1,29 +1,50 @@
# Maintainer: Natanael Copa <ncopa@alpinelinux.org>
pkgname=libxt
pkgver=1.1.3
pkgrel=0
pkgrel=1
pkgdesc="X11 toolkit intrinsics library"
url="http://xorg.freedesktop.org/"
arch="all"
license="custom"
subpackages="$pkgname-dev $pkgname-doc"
depends=
makedepends="pkgconfig libsm-dev libice-dev libx11-dev e2fsprogs-dev"
source="http://xorg.freedesktop.org/releases/individual/lib/libXt-$pkgver.tar.bz2"
depends_dev="xproto libx11-dev libsm-dev"
makedepends="$depends_dev libice-dev e2fsprogs-dev"
source="http://xorg.freedesktop.org/releases/individual/lib/libXt-$pkgver.tar.bz2
0001-Unchecked-return-values-of-XGetWindowProperty-CVE-20.patch
0002-unvalidated-length-in-_XtResourceConfigurationEH-CVE.patch
"
_builddir="$srcdir"/libXt-$pkgver
prepare() {
cd "$_builddir"
for i in $source; do
case $i in
*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;
esac
done
}
build () {
cd "$srcdir"/libXt-$pkgver
cd "$_builddir"
./configure --prefix=/usr \
--sysconfdir=/etc \
--disable-install-makestrs
|| return 1
make || return 1
}
package() {
cd "$srcdir"/libXt-$pkgver
cd "$_builddir"
make -j1 DESTDIR="$pkgdir" install || return 1
rm "$pkgdir"/usr/lib/*.la || return 1
}
md5sums="a6f137ae100e74ebe3b71eb4a38c40b3 libXt-1.1.3.tar.bz2"
md5sums="a6f137ae100e74ebe3b71eb4a38c40b3 libXt-1.1.3.tar.bz2
ddbc29bbc588eaeb01c01a94ddf8cdb8 0001-Unchecked-return-values-of-XGetWindowProperty-CVE-20.patch
4ffbba851dcb9031ec620e48d0acffe9 0002-unvalidated-length-in-_XtResourceConfigurationEH-CVE.patch"
sha256sums="8db593c3fc5ffc4e9cd854ba50af1eac9b90d66521ba17802b8f1e0d2d7f05bd libXt-1.1.3.tar.bz2
84d0bc18fb74b4bbde40ec19e7745db1fc8cdc131a2578361005b289fa6dcb09 0001-Unchecked-return-values-of-XGetWindowProperty-CVE-20.patch
758c710f423e22d17b8938574bebf8dc5c8193ef8296f8c8fb974229f886420c 0002-unvalidated-length-in-_XtResourceConfigurationEH-CVE.patch"
sha512sums="26d81ddb00f2d231afe37f0d55be9aaf95f0926086751d1816d02d15244e8ac7dc61e4e96e6ac33b2d22455aa7992c7b86e5bc9eada4ebcecaf6909dc0939416 libXt-1.1.3.tar.bz2
b1e7040636ff0ab4d67c522c46aa72d134ca47bfb8553288a28e6e69e1aafcb9bce41e4a55b2356d7145fdacef72c5018ff96923bf46d7c21e15bf30d23d40e3 0001-Unchecked-return-values-of-XGetWindowProperty-CVE-20.patch
e43430f8b904bce0a6e171a6e24f7dc85bcfa9741d742c00d7f616744ae629b7ea3bdb32dd2b4c8f006880657f6ffc809966b69ce24bdf2343ecedf4fe579b1c 0002-unvalidated-length-in-_XtResourceConfigurationEH-CVE.patch"