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Don't leak information via uninitialized space in db(3) records. [09:07]

Browse Source 
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)
This commit is contained in:
Colin Percival 2009-04-22 14:07:14 +00:00
parent 801cecc475
commit e55ab0a54b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=191381
3 changed files with 16 additions and 0 deletions
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2
crypto/openssl/crypto/asn1/asn1.h
View File

@ -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

2
crypto/openssl/crypto/asn1/asn1_err.c
View File

@ -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"},

12
crypto/openssl/crypto/asn1/tasn_dec.c
View File

@ -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)
{