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From 630f9c33c23639de85c3fd306b209b538b73b4c9 Mon Sep 17 00:00:00 2001
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From: Stanislav Malyshev <stas@php.net>
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Date: Thu, 11 Dec 2014 19:28:32 -0800
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Subject: [PATCH] Fix bug #68594 - Use after free vulnerability in
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unserialize()
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---
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NEWS | 2 +
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ext/standard/tests/serialize/bug68594.phpt | 23 ++++++++++
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ext/standard/var_unserializer.c | 68 ++++++++++++++++--------------
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ext/standard/var_unserializer.re | 3 ++
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4 files changed, 64 insertions(+), 32 deletions(-)
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create mode 100644 ext/standard/tests/serialize/bug68594.phpt
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diff --git a/ext/standard/tests/serialize/bug68594.phpt b/ext/standard/tests/serialize/bug68594.phpt
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new file mode 100644
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index 0000000..60fc7a7
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--- /dev/null
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+++ b/ext/standard/tests/serialize/bug68594.phpt
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@@ -0,0 +1,23 @@
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+--TEST--
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+Bug #68545 Use after free vulnerability in unserialize()
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+--FILE--
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+
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+for ($i=4; $i<100; $i++) {
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+ $m = new StdClass();
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+
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+ $u = array(1);
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+
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+ $m->aaa = array(1,2,&$u,4,5);
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+ $m->bbb = 1;
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+ $m->ccc = &$;;
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+ $m->ddd = str_repeat("A", $i);
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+
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+ $z = serialize($m);
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+ $z = str_replace("bbb", "aaa", $z);
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+ $y = unserialize($z);
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+ $z = serialize($y);
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+}
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+?>
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+===DONE===
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+--EXPECTF--
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+===DONE===
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diff --git a/ext/standard/var_unserializer.c b/ext/standard/var_unserializer.c
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index f6f31bd..a12d2fa 100644
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--- a/ext/standard/var_unserializer.c
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+++ b/ext/standard/var_unserializer.c
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@@ -309,6 +309,9 @@ static inline int process_nested_data(UNSERIALIZE_PARAMETER, HashTable *ht, long
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} else {
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/* object properties should include no integers */
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convert_to_string(key);
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+ if (zend_symtable_find(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&old_data)==SUCCESS) {
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+ var_push_dtor(var_hash, old_data);
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+ }
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zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data,
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sizeof data, NULL);
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}
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diff --git a/ext/standard/var_unserializer.re b/ext/standard/var_unserializer.re
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index 7afef6a..4cf1d10 100644
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--- a/ext/standard/var_unserializer.re
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+++ b/ext/standard/var_unserializer.re
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@@ -315,6 +315,9 @@ static inline int process_nested_data(UNSERIALIZE_PARAMETER, HashTable *ht, long
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} else {
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/* object properties should include no integers */
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convert_to_string(key);
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+ if (zend_symtable_find(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, (void **)&old_data)==SUCCESS) {
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+ var_push_dtor(var_hash, old_data);
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+ }
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zend_hash_update(ht, Z_STRVAL_P(key), Z_STRLEN_P(key) + 1, &data,
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sizeof data, NULL);
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}
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--
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2.1.4
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