diff -up php-5.3.27/ext/openssl/openssl.c.CVE-2013-6420 php-5.3.27/ext/openssl/openssl.c
--- php-5.3.27/ext/openssl/openssl.c.CVE-2013-6420	2013-12-13 20:13:30.108796370 +0700
+++ php-5.3.27/ext/openssl/openssl.c	2013-12-13 20:15:22.626794650 +0700
@@ -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';