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Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher

Browse Source 
(CVE-2006-4339)

Submitted by: Ben Laurie, Google Security Team
Reviewed by: bmoeller, mjc, shenson
This commit is contained in:
Mark J. Cox 2006-09-05 08:58:03 +00:00
parent 500b5a181d
commit b79aa05e3b
6 changed files with 44 additions and 3 deletions
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17
CHANGES
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@ -4,6 +4,9 @@
Changes between 0.9.8b and 0.9.9 [xx XXX xxxx]
*) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
(CVE-2006-4339) [Ben Laurie and Google Security Team]
*) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
Modify get_crl() to find a valid (unexpired) CRL if possible.
[Steve Henson]
@ -377,7 +380,12 @@
*) Change 'Configure' script to enable Camellia by default.
[NTT]
Changes between 0.9.8b and 0.9.8c [xx XXX xxxx]
Changes between 0.9.8c and 0.9.8d [xx XXX xxxx]
Changes between 0.9.8b and 0.9.8c [05 Sep 2006]
*) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
(CVE-2006-4339) [Ben Laurie and Google Security Team]
*) Add AES IGE and biIGE modes.
[Ben Laurie]
@ -1335,7 +1343,12 @@
differing sizes.
[Richard Levitte]
Changes between 0.9.7j and 0.9.7k [xx XXX xxxx]
Changes between 0.9.7k and 0.9.7l [xx XXX xxxx]
Changes between 0.9.7j and 0.9.7k [05 Sep 2006]
*) Avoid PKCS #1 v1.5 signature attack discovered by Daniel Bleichenbacher
(CVE-2006-4339) [Ben Laurie and Google Security Team]
*) Change the Unix randomness entropy gathering to use poll() when
possible instead of select(), since the latter has some

2
NEWS
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@ -7,7 +7,7 @@
Major changes between OpenSSL 0.9.8 and OpenSSL 0.9.8a:
o Fix potential SSL 2.0 rollback, CAN-2005-2969
o Fix potential SSL 2.0 rollback, CVE-2005-2969
o Extended Windows CE support
Major changes between OpenSSL 0.9.7g and OpenSSL 0.9.8:

1
crypto/rsa/rsa.h
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@ -457,6 +457,7 @@ void ERR_load_RSA_strings(void);
#define RSA_R_N_DOES_NOT_EQUAL_P_Q 127
#define RSA_R_OAEP_DECODING_ERROR 121
#define RSA_R_PADDING_CHECK_FAILED 114
#define RSA_R_PKCS1_PADDING_TOO_SHORT 105
#define RSA_R_P_NOT_PRIME 128
#define RSA_R_Q_NOT_PRIME 129
#define RSA_R_RSA_OPERATIONS_NOT_SUPPORTED 130

9
crypto/rsa/rsa_eay.c
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@ -640,6 +640,15 @@ static int RSA_eay_public_decrypt(int flen, const unsigned char *from,
{
case RSA_PKCS1_PADDING:
r=RSA_padding_check_PKCS1_type_1(to,num,buf,i,num);
/* Generally signatures should be at least 2/3 padding, though
this isn't possible for really short keys and some standard
signature schemes, so don't check if the unpadded data is
small. */
if(r > 42 && 3*8*r >= BN_num_bits(rsa->n))
{
RSAerr(RSA_F_RSA_EAY_PUBLIC_DECRYPT, RSA_R_PKCS1_PADDING_TOO_SHORT);
goto err;
}
break;
case RSA_X931_PADDING:
r=RSA_padding_check_X931(to,num,buf,i,num);

1
crypto/rsa/rsa_err.c
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@ -160,6 +160,7 @@ static ERR_STRING_DATA RSA_str_reasons[]=
{ERR_REASON(RSA_R_N_DOES_NOT_EQUAL_P_Q) ,"n does not equal p q"},
{ERR_REASON(RSA_R_OAEP_DECODING_ERROR) ,"oaep decoding error"},
{ERR_REASON(RSA_R_PADDING_CHECK_FAILED) ,"padding check failed"},
{ERR_REASON(RSA_R_PKCS1_PADDING_TOO_SHORT),"pkcs1 padding too short"},
{ERR_REASON(RSA_R_P_NOT_PRIME) ,"p not prime"},
{ERR_REASON(RSA_R_Q_NOT_PRIME) ,"q not prime"},
{ERR_REASON(RSA_R_RSA_OPERATIONS_NOT_SUPPORTED),"rsa operations not supported"},

17
crypto/rsa/rsa_sign.c
View File

@ -193,6 +193,23 @@ int int_rsa_verify(int dtype, const unsigned char *m,
sig=d2i_X509_SIG(NULL,&p,(long)i);
if (sig == NULL) goto err;
/* Excess data can be used to create forgeries */
if(p != s+i)
{
RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
goto err;
}
/* Parameters to the signature algorithm can also be used to
create forgeries */
if(sig->algor->parameter
&& ASN1_TYPE_get(sig->algor->parameter) != V_ASN1_NULL)
{
RSAerr(RSA_F_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
goto err;
}
sigtype=OBJ_obj2nid(sig->algor->algorithm);