- MFH: CVE-2007-1001, integer overflow with invalid wbmp images

diff --git a/NEWS b/NEWS
index a23563291a21cdd3ddb32ac638655e3d249c7dd0..11e22718faafc26f3ea10d1e67e2286a0efb52b7 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 PHP 4                                                                      NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
 ?? ??? 2007, Version 4.4.7
+- Fixed CVE-2007-1001, GD wbmp used with invalid image size (Pierre)
 - Fixed bug #40747 (possible crash in session when save_path is out of 
   open_basedir). (Tony)
 

diff --git a/ext/gd/config.m4 b/ext/gd/config.m4
index b1617ef92fac00b700023083f4978de8b0e06be2..086fdd5b83888fdf96bb9187b2f229fd842f4a04 100644 (file)
--- a/ext/gd/config.m4
+++ b/ext/gd/config.m4
@@ -273,7 +273,7 @@ if test "$PHP_GD" = "yes"; then
                  libgd/gdxpm.c libgd/gdfontt.c libgd/gdfonts.c libgd/gdfontmb.c libgd/gdfontl.c \
                  libgd/gdfontg.c libgd/gdtables.c libgd/gdft.c libgd/gdcache.c libgd/gdkanji.c \
                  libgd/wbmp.c libgd/gd_wbmp.c libgd/gdhelpers.c libgd/gd_topal.c libgd/gd_gif_in.c \
-                 libgd/xbm.c libgd/gd_gif_out.c "
+                 libgd/xbm.c libgd/gd_gif_out.c libgd/gd_security.c"
 
 dnl check for fabsf and floorf which are available since C99
   AC_CHECK_FUNCS(fabsf floorf)

diff --git a/ext/gd/gd.dsp b/ext/gd/gd.dsp
index 56365164d72ea1a1d970d59a9cb07fcd764b0521..782a396ccd827a2a894ed54fac436096ef3d85ac 100644 (file)
--- a/ext/gd/gd.dsp
+++ b/ext/gd/gd.dsp
@@ -104,6 +104,10 @@ SOURCE=.\gd.c
 # End Source File\r
 # Begin Source File\r
 \r
+SOURCE=.\gd_security.c\r
+# End Source File\r
+# Begin Source File\r
+\r
 SOURCE=.\gdttf.c\r
 # End Source File\r
 # End Group\r

diff --git a/ext/gd/libgd/gd_security.c b/ext/gd/libgd/gd_security.c
new file mode 100644 (file)
index 0000000..a5fea34
--- /dev/null
+++ b/ext/gd/libgd/gd_security.c
@@ -0,0 +1,33 @@
+/*
+   * gd_security.c
+   *
+   * Implements buffer overflow check routines.
+   *
+   * Written 2004, Phil Knirsch.
+   * Based on netpbm fixes by Alan Cox.
+   *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <limits.h>
+#include "gd.h"
+
+int overflow2(int a, int b)
+{
+       if(a < 0 || b < 0) {
+               php_gd_error("gd warning: one parameter to a memory allocation multiplication is negative, failing operation gracefully\n");
+               return 1;
+       }
+       if(b == 0)
+               return 0;
+       if(a > INT_MAX / b) {
+               php_gd_error("gd warning: product of memory allocation multiplication would exceed INT_MAX, failing operation gracefully\n");
+               return 1;
+       }
+       return 0;
+}

diff --git a/ext/gd/libgd/gdhelpers.h b/ext/gd/libgd/gdhelpers.h
index 33223318f161f905530e5f2bba84b2e19c0c0955..11041febeda41c84de6b73ec2c6606c417840c47 100644 (file)
--- a/ext/gd/libgd/gdhelpers.h
+++ b/ext/gd/libgd/gdhelpers.h
@@ -21,6 +21,13 @@ extern char *gd_strtok_r(char *s, char *sep, char **state);
 #define gdPFree(ptr)           pefree(ptr, 1)
 #define gdPEstrdup(ptr)                pestrdup(ptr, 1)
 
+/* Returns nonzero if multiplying the two quantities will
+       result in integer overflow. Also returns nonzero if 
+       either quantity is negative. By Phil Knirsch based on
+       netpbm fixes by Alan Cox. */
+
+int overflow2(int a, int b);
+
 #ifdef ZTS
 #define gdMutexDeclare(x) MUTEX_T x
 #define gdMutexSetup(x) x = tsrm_mutex_alloc()

diff --git a/ext/gd/libgd/wbmp.c b/ext/gd/libgd/wbmp.c
index e115e80b8260034f5ba4cdcd25e6bd2ec1435171..53603639cac03c21dc5e8cc4640e3ffbc1bdb25e 100644 (file)
--- a/ext/gd/libgd/wbmp.c
+++ b/ext/gd/libgd/wbmp.c
@@ -116,6 +116,15 @@ createwbmp (int width, int height, int color)
   if ((wbmp = (Wbmp *) gdMalloc (sizeof (Wbmp))) == NULL)
     return (NULL);
 
+  if (overflow2(sizeof (int), width)) {
+    gdFree(wbmp);
+    return NULL;
+  }
+  if (overflow2(sizeof (int) * width, height)) {
+    gdFree(wbmp);
+    return NULL;
+  }
+
   if ((wbmp->bitmap = (int *) safe_emalloc(sizeof(int), (width * height), 0)) == NULL)
     {
       gdFree (wbmp);
@@ -176,6 +185,13 @@ readwbmp (int (*getin) (void *in), void *in, Wbmp ** return_wbmp)
   printf ("W: %d, H: %d\n", wbmp->width, wbmp->height);
 #endif
 
+  if (overflow2(sizeof (int), wbmp->width) ||
+    overflow2(sizeof (int) * wbmp->width, wbmp->height))
+    {
+      gdFree(wbmp);
+      return (-1);
+    }
+
   if ((wbmp->bitmap = (int *) safe_emalloc(sizeof(int), (wbmp->width * wbmp->height), 0)) == NULL)
     {
       gdFree (wbmp);

diff --git a/ext/gd/tests/createfromwbmp2.phpt b/ext/gd/tests/createfromwbmp2.phpt
new file mode 100644 (file)
index 0000000..4c67913
--- /dev/null
+++ b/ext/gd/tests/createfromwbmp2.phpt
@@ -0,0 +1,47 @@
+--TEST--
+imagecreatefromwbmp with invalid wbmp
+--SKIPIF--
+<?php
+       if (!function_exists('imagecreatefromwbmp')) die("skip gd extension not available\n");
+?>
+--FILE--
+<?php
+$filename = dirname(__FILE__) . '/_tmp.wbmp';
+$fp = fopen($filename,"wb");
+if (!$fp) {
+       exit("Failed to create <$filename>");
+}
+
+//write header
+$c = 0;
+fputs($fp, chr($c), 1);
+fputs($fp, $c, 1);
+
+//write width = 2^32 / 4 + 1
+$c = 0x84;
+fputs($fp, chr($c), 1);
+$c = 0x80;
+fputs($fp, chr($c), 1);
+fputs($fp, chr($c), 1);
+fputs($fp, chr($c), 1);
+$c = 0x01;
+fputs($fp, chr($c), 1);
+
+/*write height = 4*/
+$c = 0x04;
+fputs($fp, chr($c), 1);
+
+/*write some data to cause overflow*/
+for ($i=0; $i<10000; $i++) {
+       fwrite($fp, chr($c), 1);
+}
+
+fclose($fp);
+$im = imagecreatefromwbmp($filename);
+unlink($filename);
+?>
+--EXPECTF--
+Warning: imagecreatefromwbmp() [/phpmanual/function.imagecreatefromwbmp.html]: gd warning: product of memory allocation multiplication would exceed INT_MAX, failing operation gracefully
+ in %s on line %d
+
+Warning: imagecreatefromwbmp() [/phpmanual/function.imagecreatefromwbmp.html]: '%s' is not a valid WBMP file in %s on line %d