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@ -75,3 +75,59 @@ diff -u -r1.30.2.2 rsa_lib.c
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}
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void RSA_set_default_method(const RSA_METHOD *meth)
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Index: ssl/s3_srvr.c
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============================================================================
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$ cvs diff -u -r1.104 -r1.105 s3_srvr.c
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--- ssl/s3_srvr.c 28 Feb 2003 15:37:10 -0000 1.104
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+++ ssl/s3_srvr.c 19 Mar 2003 19:19:53 -0000 1.105
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@@ -1684,7 +1684,7 @@
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if (i != SSL_MAX_MASTER_KEY_LENGTH)
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{
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al=SSL_AD_DECODE_ERROR;
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- SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
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+ /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
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}
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if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
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@@ -1700,30 +1700,29 @@
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(p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
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{
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al=SSL_AD_DECODE_ERROR;
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- SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER);
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- goto f_err;
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+ /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
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+
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+ /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
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+ * (http://eprint.iacr.org/2003/052/) exploits the version
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+ * number check as a "bad version oracle" -- an alert would
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+ * reveal that the plaintext corresponding to some ciphertext
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+ * made up by the adversary is properly formatted except
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+ * that the version number is wrong. To avoid such attacks,
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+ * we should treat this just like any other decryption error. */
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+ p[0] = (char)(int) "CAN-2003-0131 patch 2003-03-20";
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}
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}
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if (al != -1)
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{
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-#if 0
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- goto f_err;
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-#else
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/* Some decryption failure -- use random value instead as countermeasure
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* against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
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- * (see RFC 2246, section 7.4.7.1).
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- * But note that due to length and protocol version checking, the
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- * attack is impractical anyway (see section 5 in D. Bleichenbacher:
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- * "Chosen Ciphertext Attacks Against Protocols Based on the RSA
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- * Encryption Standard PKCS #1", CRYPTO '98, LNCS 1462, pp. 1-12).
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- */
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+ * (see RFC 2246, section 7.4.7.1). */
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ERR_clear_error();
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i = SSL_MAX_MASTER_KEY_LENGTH;
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p[0] = s->client_version >> 8;
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p[1] = s->client_version & 0xff;
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RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
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-#endif
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}
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s->session->master_key_length=
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