-
Notifications
You must be signed in to change notification settings - Fork 7.7k
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Fixed ##72433: Use After Free Vulnerability in PHP's GC algorithm and…
… unserialize
- Loading branch information
Showing
3 changed files
with
44 additions
and
1 deletion.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
|
@@ -13,5 +13,5 @@ var_dump(gc_collect_cycles()); | |
echo "ok\n"; | ||
?> | ||
--EXPECT-- | ||
int(1) | ||
int(2) | ||
ok |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,32 @@ | ||
--TEST-- | ||
Bug #72433: Use After Free Vulnerability in PHP's GC algorithm and unserialize | ||
--FILE-- | ||
<?php | ||
// Fill any potential freed spaces until now. | ||
$filler = array(); | ||
for($i = 0; $i < 100; $i++) | ||
$filler[] = ""; | ||
// Create our payload and unserialize it. | ||
$serialized_payload = 'a:3:{i:0;r:1;i:1;r:1;i:2;C:11:"ArrayObject":19:{x:i:0;r:1;;m:a:0:{}}}'; | ||
$free_me = unserialize($serialized_payload); | ||
// We need to increment the reference counter of our ArrayObject s.t. all reference counters of our unserialized array become 0. | ||
$inc_ref_by_one = $free_me[2]; | ||
// The call to gc_collect_cycles will free '$free_me'. | ||
gc_collect_cycles(); | ||
// We now have multiple freed spaces. Fill all of them. | ||
$fill_freed_space_1 = "filler_zval_1"; | ||
$fill_freed_space_2 = "filler_zval_2"; | ||
var_dump($free_me); | ||
?> | ||
--EXPECTF-- | ||
array(3) { | ||
[0]=> | ||
*RECURSION* | ||
[1]=> | ||
*RECURSION* | ||
[2]=> | ||
object(ArrayObject)#%d (1) { | ||
["storage":"ArrayObject":private]=> | ||
*RECURSION* | ||
} | ||
} |