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From c1224573c773b6845e83505f717fbf820fc18415 Mon Sep 17 00:00:00 2001
From: Stanislav Malyshev <stas@php.net>
Date: Sun, 8 Dec 2013 11:40:18 -0800
Subject: [PATCH] Fix CVE-2013-6420 - memory corruption in openssl_x509_parse
---
NEWS | 4 +++-
ext/openssl/openssl.c | 18 ++++++++++++++----
ext/openssl/tests/cve-2013-6420.crt | 29 +++++++++++++++++++++++++++++
ext/openssl/tests/cve-2013-6420.phpt | 18 ++++++++++++++++++
4 files changed, 64 insertions(+), 5 deletions(-)
create mode 100644 ext/openssl/tests/cve-2013-6420.crt
create mode 100644 ext/openssl/tests/cve-2013-6420.phpt
--- php5.orig/ext/openssl/openssl.c
+++ php5/ext/openssl/openssl.c
@@ -644,18 +644,28 @@ static time_t asn1_time_to_time_t(ASN1_U
char * thestr;
long gmadjust = 0;
- if (timestr->length < 13) {
- php_error_docref(NULL TSRMLS_CC, E_WARNING, "extension author too lazy to parse %s correctly", timestr->data);
+ if (ASN1_STRING_type(timestr) != V_ASN1_UTCTIME) {
+ php_error_docref(NULL TSRMLS_CC, E_WARNING, "illegal ASN1 data type for timestamp");
return (time_t)-1;
}
- strbuf = estrdup((char *)timestr->data);
+ if (ASN1_STRING_length(timestr) != strlen(ASN1_STRING_data(timestr))) {
+ php_error_docref(NULL TSRMLS_CC, E_WARNING, "illegal length in timestamp");
+ return (time_t)-1;
+ }
+
+ if (ASN1_STRING_length(timestr) < 13) {
+ php_error_docref(NULL TSRMLS_CC, E_WARNING, "unable to parse time string %s correctly", timestr->data);
+ return (time_t)-1;
+ }
+
+ strbuf = estrdup((char *)ASN1_STRING_data(timestr));
memset(&thetime, 0, sizeof(thetime));
/* we work backwards so that we can use atoi more easily */
- thestr = strbuf + timestr->length - 3;
+ thestr = strbuf + ASN1_STRING_length(timestr) - 3;
thetime.tm_sec = atoi(thestr);
*thestr = '\0';
--- /dev/null
+++ php5/ext/openssl/tests/cve-2013-6420.crt
@@ -0,0 +1,29 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
+
+
--- /dev/null
+++ php5/ext/openssl/tests/cve-2013-6420.phpt
@@ -0,0 +1,18 @@
+--TEST--
+CVE-2013-6420
+--SKIPIF--
+<?php
+if (!extension_loaded("openssl")) die("skip");
+?>
+--FILE--
+<?php
+$crt = substr(__FILE__, 0, -4).'.crt';
+$info = openssl_x509_parse("file://$crt");
+var_dump($info['issuer']['emailAddress'], $info["validFrom_time_t"]);
+?>
+Done
+--EXPECTF--
+%s openssl_x509_parse(): illegal ASN1 data type for timestamp in %s%ecve-2013-6420.php on line 3
+string(27) "stefan.esser@sektioneins.de"
+int(-1)
+Done
|
