From e55ab0a54b06a1f09099d92989dc5dade6fec89f Mon Sep 17 00:00:00 2001
From: Colin Percival <cperciva@FreeBSD.org>
Date: Wed, 22 Apr 2009 14:07:14 +0000
Subject: [PATCH] Don't leak information via uninitialized space in db(3)
 records. [09:07]

Sanity-check string lengths in order to stop OpenSSL crashing
when printing corrupt BMPString or UniversalString objects. [09:08]

Security:	FreeBSD-SA-09:07.libc
Security:	FreeBSD-SA-09:08.openssl
Security:	CVE-2009-0590
Approved by:	re (kensmith)
Approved by:	so (cperciva)
---
 crypto/openssl/crypto/asn1/asn1.h     |  2 ++
 crypto/openssl/crypto/asn1/asn1_err.c |  2 ++
 crypto/openssl/crypto/asn1/tasn_dec.c | 12 ++++++++++++
 3 files changed, 16 insertions(+)

diff --git a/crypto/openssl/crypto/asn1/asn1.h b/crypto/openssl/crypto/asn1/asn1.h
index a60ab04a340a..4574b21a21aa 100644
--- a/crypto/openssl/crypto/asn1/asn1.h
+++ b/crypto/openssl/crypto/asn1/asn1.h
@@ -1134,6 +1134,7 @@ void ERR_load_ASN1_strings(void);
 #define ASN1_R_BAD_OBJECT_HEADER			 102
 #define ASN1_R_BAD_PASSWORD_READ			 103
 #define ASN1_R_BAD_TAG					 104
+#define ASN1_R_BMPSTRING_IS_WRONG_LENGTH		 210
 #define ASN1_R_BN_LIB					 105
 #define ASN1_R_BOOLEAN_IS_WRONG_LENGTH			 106
 #define ASN1_R_BUFFER_TOO_SMALL				 107
@@ -1213,6 +1214,7 @@ void ERR_load_ASN1_strings(void);
 #define ASN1_R_UNABLE_TO_DECODE_RSA_KEY			 157
 #define ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY		 158
 #define ASN1_R_UNEXPECTED_EOC				 159
+#define ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH		 211
 #define ASN1_R_UNKNOWN_FORMAT				 160
 #define ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM		 161
 #define ASN1_R_UNKNOWN_OBJECT_TYPE			 162
diff --git a/crypto/openssl/crypto/asn1/asn1_err.c b/crypto/openssl/crypto/asn1/asn1_err.c
index f6b5c3f3dd77..796cc96a7e51 100644
--- a/crypto/openssl/crypto/asn1/asn1_err.c
+++ b/crypto/openssl/crypto/asn1/asn1_err.c
@@ -188,6 +188,7 @@ static ERR_STRING_DATA ASN1_str_reasons[]=
 {ERR_REASON(ASN1_R_BAD_OBJECT_HEADER)    ,"bad object header"},
 {ERR_REASON(ASN1_R_BAD_PASSWORD_READ)    ,"bad password read"},
 {ERR_REASON(ASN1_R_BAD_TAG)              ,"bad tag"},
+{ERR_REASON(ASN1_R_BMPSTRING_IS_WRONG_LENGTH),"bmpstring is wrong length"},
 {ERR_REASON(ASN1_R_BN_LIB)               ,"bn lib"},
 {ERR_REASON(ASN1_R_BOOLEAN_IS_WRONG_LENGTH),"boolean is wrong length"},
 {ERR_REASON(ASN1_R_BUFFER_TOO_SMALL)     ,"buffer too small"},
@@ -267,6 +268,7 @@ static ERR_STRING_DATA ASN1_str_reasons[]=
 {ERR_REASON(ASN1_R_UNABLE_TO_DECODE_RSA_KEY),"unable to decode rsa key"},
 {ERR_REASON(ASN1_R_UNABLE_TO_DECODE_RSA_PRIVATE_KEY),"unable to decode rsa private key"},
 {ERR_REASON(ASN1_R_UNEXPECTED_EOC)       ,"unexpected eoc"},
+{ERR_REASON(ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH),"universalstring is wrong length"},
 {ERR_REASON(ASN1_R_UNKNOWN_FORMAT)       ,"unknown format"},
 {ERR_REASON(ASN1_R_UNKNOWN_MESSAGE_DIGEST_ALGORITHM),"unknown message digest algorithm"},
 {ERR_REASON(ASN1_R_UNKNOWN_OBJECT_TYPE)  ,"unknown object type"},
diff --git a/crypto/openssl/crypto/asn1/tasn_dec.c b/crypto/openssl/crypto/asn1/tasn_dec.c
index 66d229b08b39..ab646daa6a26 100644
--- a/crypto/openssl/crypto/asn1/tasn_dec.c
+++ b/crypto/openssl/crypto/asn1/tasn_dec.c
@@ -1012,6 +1012,18 @@ int asn1_ex_c2i(ASN1_VALUE **pval, const unsigned char *cont, int len,
 		case V_ASN1_SET:
 		case V_ASN1_SEQUENCE:
 		default:
+		if (utype == V_ASN1_BMPSTRING && (len & 1))
+			{
+			ASN1err(ASN1_F_ASN1_EX_C2I,
+					ASN1_R_BMPSTRING_IS_WRONG_LENGTH);
+			goto err;
+			}
+		if (utype == V_ASN1_UNIVERSALSTRING && (len & 3))
+			{
+			ASN1err(ASN1_F_ASN1_EX_C2I,
+					ASN1_R_UNIVERSALSTRING_IS_WRONG_LENGTH);
+			goto err;
+			}
 		/* All based on ASN1_STRING and handled the same */
 		if (!*pval)
 			{