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gnu: openssl: Fix CVE-2016-2177 and CVE-2016-2178. 

* gnu/packages/patches/openssl-CVE-2016-2177.patch,
gnu/packages/patches/openssl-CVE-2016-2178.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/tls.scm (openssl/fixed): Use them.
master
Leo Famulari 2016-06-13 16:15:34 -04:00
parent a44fd439dc
commit 9c4a8514d6
No known key found for this signature in database
GPG Key ID: 2646FA30BACA7F08
4 changed files with 403 additions and 1 deletions
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2
gnu/local.mk
View File

@ -686,6 +686,8 @@ dist_patch_DATA = \
%D%/packages/patches/openssh-CVE-2015-8325.patch \
%D%/packages/patches/openssl-runpath.patch \
%D%/packages/patches/openssl-c-rehash-in.patch \
%D%/packages/patches/openssl-CVE-2016-2177.patch \
%D%/packages/patches/openssl-CVE-2016-2178.patch \
%D%/packages/patches/orpheus-cast-errors-and-includes.patch \
%D%/packages/patches/ots-no-include-missing-file.patch \
%D%/packages/patches/patchelf-page-size.patch \

286
gnu/packages/patches/openssl-CVE-2016-2177.patch 100644
View File

@ -0,0 +1,286 @@
Fix CVE-2016-2177.
<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2177>
Source:
<https://git.openssl.org/?p=openssl.git;a=commit;h=a004e72b95835136d3f1ea90517f706c24c03da7>
From a004e72b95835136d3f1ea90517f706c24c03da7 Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Thu, 5 May 2016 11:10:26 +0100
Subject: [PATCH] Avoid some undefined pointer arithmetic
A common idiom in the codebase is:
if (p + len > limit)
{
return; /* Too long */
}
Where "p" points to some malloc'd data of SIZE bytes and
limit == p + SIZE
"len" here could be from some externally supplied data (e.g. from a TLS
message).
The rules of C pointer arithmetic are such that "p + len" is only well
defined where len <= SIZE. Therefore the above idiom is actually
undefined behaviour.
For example this could cause problems if some malloc implementation
provides an address for "p" such that "p + len" actually overflows for
values of len that are too big and therefore p + len < limit!
Issue reported by Guido Vranken.
CVE-2016-2177
Reviewed-by: Rich Salz <rsalz@openssl.org>
---
ssl/s3_srvr.c | 14 +++++++-------
ssl/ssl_sess.c | 2 +-
ssl/t1_lib.c | 56 ++++++++++++++++++++++++++++++--------------------------
3 files changed, 38 insertions(+), 34 deletions(-)
diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index ab28702..ab7f690 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -980,7 +980,7 @@ int ssl3_get_client_hello(SSL *s)
session_length = *(p + SSL3_RANDOM_SIZE);
- if (p + SSL3_RANDOM_SIZE + session_length + 1 >= d + n) {
+ if (SSL3_RANDOM_SIZE + session_length + 1 >= (d + n) - p) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
@@ -998,7 +998,7 @@ int ssl3_get_client_hello(SSL *s)
/* get the session-id */
j = *(p++);
- if (p + j > d + n) {
+ if ((d + n) - p < j) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
@@ -1054,14 +1054,14 @@ int ssl3_get_client_hello(SSL *s)
if (SSL_IS_DTLS(s)) {
/* cookie stuff */
- if (p + 1 > d + n) {
+ if ((d + n) - p < 1) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
}
cookie_len = *(p++);
- if (p + cookie_len > d + n) {
+ if ((d + n ) - p < cookie_len) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
@@ -1131,7 +1131,7 @@ int ssl3_get_client_hello(SSL *s)
}
}
- if (p + 2 > d + n) {
+ if ((d + n ) - p < 2) {
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
goto f_err;
@@ -1145,7 +1145,7 @@ int ssl3_get_client_hello(SSL *s)
}
/* i bytes of cipher data + 1 byte for compression length later */
- if ((p + i + 1) > (d + n)) {
+ if ((d + n) - p < i + 1) {
/* not enough data */
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
@@ -1211,7 +1211,7 @@ int ssl3_get_client_hello(SSL *s)
/* compression */
i = *(p++);
- if ((p + i) > (d + n)) {
+ if ((d + n) - p < i) {
/* not enough data */
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
index b182998..54ee783 100644
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -573,7 +573,7 @@ int ssl_get_prev_session(SSL *s, unsigned char *session_id, int len,
int r;
#endif
- if (session_id + len > limit) {
+ if (limit - session_id < len) {
fatal = 1;
goto err;
}
diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index fb64607..cdac011 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1867,11 +1867,11 @@ static void ssl_check_for_safari(SSL *s, const unsigned char *data,
0x02, 0x03, /* SHA-1/ECDSA */
};
- if (data >= (limit - 2))
+ if (limit - data <= 2)
return;
data += 2;
- if (data > (limit - 4))
+ if (limit - data < 4)
return;
n2s(data, type);
n2s(data, size);
@@ -1879,7 +1879,7 @@ static void ssl_check_for_safari(SSL *s, const unsigned char *data,
if (type != TLSEXT_TYPE_server_name)
return;
- if (data + size > limit)
+ if (limit - data < size)
return;
data += size;
@@ -1887,7 +1887,7 @@ static void ssl_check_for_safari(SSL *s, const unsigned char *data,
const size_t len1 = sizeof(kSafariExtensionsBlock);
const size_t len2 = sizeof(kSafariTLS12ExtensionsBlock);
- if (data + len1 + len2 != limit)
+ if (limit - data != (int)(len1 + len2))
return;
if (memcmp(data, kSafariExtensionsBlock, len1) != 0)
return;
@@ -1896,7 +1896,7 @@ static void ssl_check_for_safari(SSL *s, const unsigned char *data,
} else {
const size_t len = sizeof(kSafariExtensionsBlock);
- if (data + len != limit)
+ if (limit - data != (int)(len))
return;
if (memcmp(data, kSafariExtensionsBlock, len) != 0)
return;
@@ -2053,19 +2053,19 @@ static int ssl_scan_clienthello_tlsext(SSL *s, unsigned char **p,
if (data == limit)
goto ri_check;
- if (data > (limit - 2))
+ if (limit - data < 2)
goto err;
n2s(data, len);
- if (data + len != limit)
+ if (limit - data != len)
goto err;
- while (data <= (limit - 4)) {
+ while (limit - data >= 4) {
n2s(data, type);
n2s(data, size);
- if (data + size > (limit))
+ if (limit - data < size)
goto err;
# if 0
fprintf(stderr, "Received extension type %d size %d\n", type, size);
@@ -2472,18 +2472,18 @@ static int ssl_scan_clienthello_custom_tlsext(SSL *s,
if (s->hit || s->cert->srv_ext.meths_count == 0)
return 1;
- if (data >= limit - 2)
+ if (limit - data <= 2)
return 1;
n2s(data, len);
- if (data > limit - len)
+ if (limit - data < len)
return 1;
- while (data <= limit - 4) {
+ while (limit - data >= 4) {
n2s(data, type);
n2s(data, size);
- if (data + size > limit)
+ if (limit - data < size)
return 1;
if (custom_ext_parse(s, 1 /* server */ , type, data, size, al) <= 0)
return 0;
@@ -2569,20 +2569,20 @@ static int ssl_scan_serverhello_tlsext(SSL *s, unsigned char **p,
SSL_TLSEXT_HB_DONT_SEND_REQUESTS);
# endif
- if (data >= (d + n - 2))
+ if ((d + n) - data <= 2)
goto ri_check;
n2s(data, length);
- if (data + length != d + n) {
+ if ((d + n) - data != length) {
*al = SSL_AD_DECODE_ERROR;
return 0;
}
- while (data <= (d + n - 4)) {
+ while ((d + n) - data >= 4) {
n2s(data, type);
n2s(data, size);
- if (data + size > (d + n))
+ if ((d + n) - data < size)
goto ri_check;
if (s->tlsext_debug_cb)
@@ -3307,29 +3307,33 @@ int tls1_process_ticket(SSL *s, unsigned char *session_id, int len,
/* Skip past DTLS cookie */
if (SSL_IS_DTLS(s)) {
i = *(p++);
- p += i;
- if (p >= limit)
+
+ if (limit - p <= i)
return -1;
+
+ p += i;
}
/* Skip past cipher list */
n2s(p, i);
- p += i;
- if (p >= limit)
+ if (limit - p <= i)
return -1;
+ p += i;
+
/* Skip past compression algorithm list */
i = *(p++);
- p += i;
- if (p > limit)
+ if (limit - p < i)
return -1;
+ p += i;
+
/* Now at start of extensions */
- if ((p + 2) >= limit)
+ if (limit - p <= 2)
return 0;
n2s(p, i);
- while ((p + 4) <= limit) {
+ while (limit - p >= 4) {
unsigned short type, size;
n2s(p, type);
n2s(p, size);
- if (p + size > limit)
+ if (limit - p < size)
return 0;
if (type == TLSEXT_TYPE_session_ticket) {
int r;
--
2.8.4

112
gnu/packages/patches/openssl-CVE-2016-2178.patch 100644
View File

@ -0,0 +1,112 @@
Fix CVE-2016-2178.
<https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2178>
Source:
<https://git.openssl.org/?p=openssl.git;a=commit;h=621eaf49a289bfac26d4cbcdb7396e796784c534>
<https://git.openssl.org/?p=openssl.git;a=commit;h=b7d0f2834e139a20560d64c73e2565e93715ce2b>
From 621eaf49a289bfac26d4cbcdb7396e796784c534 Mon Sep 17 00:00:00 2001
From: Cesar Pereida <cesar.pereida@aalto.fi>
Date: Mon, 23 May 2016 12:45:25 +0300
Subject: [PATCH 1/2] Fix DSA, preserve BN_FLG_CONSTTIME
Operations in the DSA signing algorithm should run in constant time in
order to avoid side channel attacks. A flaw in the OpenSSL DSA
implementation means that a non-constant time codepath is followed for
certain operations. This has been demonstrated through a cache-timing
attack to be sufficient for an attacker to recover the private DSA key.
CVE-2016-2178
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
---
crypto/dsa/dsa_ossl.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
index efc4f1b..b29eb4b 100644
--- a/crypto/dsa/dsa_ossl.c
+++ b/crypto/dsa/dsa_ossl.c
@@ -248,9 +248,6 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
if (!BN_rand_range(&k, dsa->q))
goto err;
while (BN_is_zero(&k)) ;
- if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
- BN_set_flags(&k, BN_FLG_CONSTTIME);
- }
if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
@@ -279,9 +276,12 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
}
K = &kq;
+
+ BN_set_flags(K, BN_FLG_CONSTTIME);
} else {
K = &k;
}
+
DSA_BN_MOD_EXP(goto err, dsa, r, dsa->g, K, dsa->p, ctx,
dsa->method_mont_p);
if (!BN_mod(r, r, dsa->q, ctx))
--
2.8.4
From b7d0f2834e139a20560d64c73e2565e93715ce2b Mon Sep 17 00:00:00 2001
From: Matt Caswell <matt@openssl.org>
Date: Tue, 7 Jun 2016 09:12:51 +0100
Subject: [PATCH 2/2] More fix DSA, preserve BN_FLG_CONSTTIME
The previous "fix" still left "k" exposed to constant time problems in
the later BN_mod_inverse() call. Ensure both k and kq have the
BN_FLG_CONSTTIME flag set at the earliest opportunity after creation.
CVE-2016-2178
Reviewed-by: Rich Salz <rsalz@openssl.org>
---
crypto/dsa/dsa_ossl.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/crypto/dsa/dsa_ossl.c b/crypto/dsa/dsa_ossl.c
index b29eb4b..58013a4 100644
--- a/crypto/dsa/dsa_ossl.c
+++ b/crypto/dsa/dsa_ossl.c
@@ -247,7 +247,12 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
do
if (!BN_rand_range(&k, dsa->q))
goto err;
- while (BN_is_zero(&k)) ;
+ while (BN_is_zero(&k));
+
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
+ BN_set_flags(&k, BN_FLG_CONSTTIME);
+ }
+
if (dsa->flags & DSA_FLAG_CACHE_MONT_P) {
if (!BN_MONT_CTX_set_locked(&dsa->method_mont_p,
@@ -261,6 +266,8 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
if (!BN_copy(&kq, &k))
goto err;
+ BN_set_flags(&kq, BN_FLG_CONSTTIME);
+
/*
* We do not want timing information to leak the length of k, so we
* compute g^k using an equivalent exponent of fixed length. (This
@@ -276,8 +283,6 @@ static int dsa_sign_setup(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
}
K = &kq;
-
- BN_set_flags(K, BN_FLG_CONSTTIME);
} else {
K = &k;
}
--
2.8.4

4
gnu/packages/tls.scm
View File

@ -316,7 +316,9 @@ required structures.")
(base32
"06996ds1rk8xhnyb5y273a7xkcxhggp4bq1g02rab55d7bjhfh0x"))
(patches (search-patches "openssl-runpath.patch"
"openssl-c-rehash-in.patch")))))))
"openssl-c-rehash-in.patch"
"openssl-CVE-2016-2177.patch"
"openssl-CVE-2016-2178.patch")))))))
(define-public libressl
(package