fix RSA signature padding vulnerability in OpenSSL libcrypto CVE-2006-4339;

ok beck@ miod@

1 files changed, 17 insertions, 0 deletions

diff --git a/src/lib/libcrypto/rsa/rsa_sign.c b/src/lib/libcrypto/rsa/rsa_sign.c
index cee09eccb1..db86f1ac58 100644
--- a/src/lib/libcrypto/rsa/rsa_sign.c
+++ b/src/lib/libcrypto/rsa/rsa_sign.c
@@ -185,6 +185,23 @@ int RSA_verify(int dtype, const unsigned char *m, unsigned int m_len,
                 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);