forked from pool/openssl
42aa3a9eb7
- security update: * CVE-2015-0209 (bnc#919648) - Fix a failure to NULL a pointer freed on error * CVE-2015-0286 (bnc#922496) - Segmentation fault in ASN1_TYPE_cmp * CVE-2015-0287 (bnc#922499) - ASN.1 structure reuse memory corruption * CVE-2015-0288 x509: (bnc#920236) - added missing public key is not NULL check * CVE-2015-0289 (bnc#922500) - PKCS7 NULL pointer dereferences * CVE-2015-0293 (bnc#922488) - Fix reachable assert in SSLv2 servers * added patches: openssl-CVE-2015-0209.patch openssl-CVE-2015-0286.patch openssl-CVE-2015-0287.patch openssl-CVE-2015-0288.patch openssl-CVE-2015-0289.patch openssl-CVE-2015-0293.patch (forwarded request 291606 from vitezslav_cizek) OBS-URL: https://build.opensuse.org/request/show/291607 OBS-URL: https://build.opensuse.org/package/show/openSUSE:Factory/openssl?expand=0&rev=126
125 lines
4.6 KiB
Diff
125 lines
4.6 KiB
Diff
commit a40c1bcb8c37fbad24d8f28f0fb0204d76f0fee2
|
|
Author: Emilia Kasper <emilia@openssl.org>
|
|
Date: Wed Mar 4 09:05:02 2015 -0800
|
|
|
|
Fix reachable assert in SSLv2 servers.
|
|
|
|
This assert is reachable for servers that support SSLv2 and export ciphers.
|
|
Therefore, such servers can be DoSed by sending a specially crafted
|
|
SSLv2 CLIENT-MASTER-KEY.
|
|
|
|
Also fix s2_srvr.c to error out early if the key lengths are malformed.
|
|
These lengths are sent unencrypted, so this does not introduce an oracle.
|
|
|
|
CVE-2015-0293
|
|
|
|
This issue was discovered by Sean Burford (Google) and Emilia Käsper of
|
|
the OpenSSL development team.
|
|
|
|
Reviewed-by: Richard Levitte <levitte@openssl.org>
|
|
Reviewed-by: Tim Hudson <tjh@openssl.org>
|
|
|
|
Index: openssl-1.0.1i/ssl/s2_lib.c
|
|
===================================================================
|
|
--- openssl-1.0.1i.orig/ssl/s2_lib.c 2015-03-17 14:05:13.745459798 +0100
|
|
+++ openssl-1.0.1i/ssl/s2_lib.c 2015-03-17 14:05:14.763474757 +0100
|
|
@@ -487,7 +487,7 @@ int ssl2_generate_key_material(SSL *s)
|
|
|
|
OPENSSL_assert(s->session->master_key_length >= 0
|
|
&& s->session->master_key_length
|
|
- < (int)sizeof(s->session->master_key));
|
|
+ <= (int)sizeof(s->session->master_key));
|
|
EVP_DigestUpdate(&ctx,s->session->master_key,s->session->master_key_length);
|
|
EVP_DigestUpdate(&ctx,&c,1);
|
|
c++;
|
|
Index: openssl-1.0.1i/ssl/s2_srvr.c
|
|
===================================================================
|
|
--- openssl-1.0.1i.orig/ssl/s2_srvr.c 2015-03-17 14:05:13.721459445 +0100
|
|
+++ openssl-1.0.1i/ssl/s2_srvr.c 2015-03-17 14:07:43.262655766 +0100
|
|
@@ -446,9 +446,6 @@ static int get_client_master_key(SSL *s)
|
|
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
|
|
return(-1);
|
|
}
|
|
- i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
|
|
- &(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
|
|
- (s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
|
|
|
|
is_export=SSL_C_IS_EXPORT(s->session->cipher);
|
|
|
|
@@ -467,21 +464,59 @@ static int get_client_master_key(SSL *s)
|
|
else
|
|
ek=5;
|
|
|
|
+ /*
|
|
+ * The format of the CLIENT-MASTER-KEY message is
|
|
+ * 1 byte message type
|
|
+ * 3 bytes cipher
|
|
+ * 2-byte clear key length (stored in s->s2->tmp.clear)
|
|
+ * 2-byte encrypted key length (stored in s->s2->tmp.enc)
|
|
+ * 2-byte key args length (IV etc)
|
|
+ * clear key
|
|
+ * encrypted key
|
|
+ * key args
|
|
+ *
|
|
+ * If the cipher is an export cipher, then the encrypted key bytes
|
|
+ * are a fixed portion of the total key (5 or 8 bytes). The size of
|
|
+ * this portion is in |ek|. If the cipher is not an export cipher,
|
|
+ * then the entire key material is encrypted (i.e., clear key length
|
|
+ * must be zero).
|
|
+ */
|
|
+ if ((!is_export && s->s2->tmp.clear != 0) ||
|
|
+ (is_export && s->s2->tmp.clear + ek != EVP_CIPHER_key_length(c))) {
|
|
+ ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
|
|
+ SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_LENGTH);
|
|
+ return -1;
|
|
+ }
|
|
+ /*
|
|
+ * The encrypted blob must decrypt to the encrypted portion of the key.
|
|
+ * Decryption can't be expanding, so if we don't have enough encrypted
|
|
+ * bytes to fit the key in the buffer, stop now.
|
|
+ */
|
|
+ if ((is_export && s->s2->tmp.enc < ek) ||
|
|
+ (!is_export && s->s2->tmp.enc < EVP_CIPHER_key_length(c))) {
|
|
+ ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
|
|
+ SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_LENGTH_TOO_SHORT);
|
|
+ return -1;
|
|
+ }
|
|
+
|
|
+ i = ssl_rsa_private_decrypt(s->cert, s->s2->tmp.enc,
|
|
+ &(p[s->s2->tmp.clear]),
|
|
+ &(p[s->s2->tmp.clear]),
|
|
+ (s->s2->ssl2_rollback) ? RSA_SSLV23_PADDING :
|
|
+ RSA_PKCS1_PADDING);
|
|
+
|
|
/* bad decrypt */
|
|
#if 1
|
|
/* If a bad decrypt, continue with protocol but with a
|
|
* random master secret (Bleichenbacher attack) */
|
|
- if ((i < 0) ||
|
|
- ((!is_export && (i != EVP_CIPHER_key_length(c)))
|
|
- || (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
|
|
- (unsigned int)EVP_CIPHER_key_length(c))))))
|
|
- {
|
|
+ if ((i < 0) || ((!is_export && i != EVP_CIPHER_key_length(c))
|
|
+ || (is_export && i != ek))) {
|
|
ERR_clear_error();
|
|
if (is_export)
|
|
i=ek;
|
|
else
|
|
i=EVP_CIPHER_key_length(c);
|
|
- if (RAND_pseudo_bytes(p,i) <= 0)
|
|
+ if (RAND_pseudo_bytes(&p[s->s2->tmp.clear], i) <= 0)
|
|
return 0;
|
|
}
|
|
#else
|
|
@@ -505,7 +540,8 @@ static int get_client_master_key(SSL *s)
|
|
}
|
|
#endif
|
|
|
|
- if (is_export) i+=s->s2->tmp.clear;
|
|
+ if (is_export)
|
|
+ i = EVP_CIPHER_key_length(c);
|
|
|
|
if (i > SSL_MAX_MASTER_KEY_LENGTH)
|
|
{
|