openssl: fix CVE-2014-0221

From the OpenSSL Security Advisory [05 Jun 2014]
http://www.openssl.org/news/secadv_20140605.txt

DTLS recursion flaw (CVE-2014-0221)

By sending an invalid DTLS handshake to an OpenSSL DTLS client the code
can be made to recurse eventually crashing in a DoS attack.

Only applications using OpenSSL as a DTLS client are affected.

(Patch borrowed from Fedora.)

(From OE-Core rev: 2a9e46a319d32e99266fd44e1ea1ca2b5e7c9a6a)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 39 insertions, 0 deletions

diff --git a/meta/recipes-connectivity/openssl/openssl-1.0.1e/openssl-1.0.1e-cve-2014-0221.patch b/meta/recipes-connectivity/openssl/openssl-1.0.1e/openssl-1.0.1e-cve-2014-0221.patch
new file mode 100644
index 0000000000..bf730a8124
--- /dev/null
+++ b/meta/recipes-connectivity/openssl/openssl-1.0.1e/openssl-1.0.1e-cve-2014-0221.patch
@@ -0,0 +1,38 @@
+commit d30e582446b027868cdabd0994681643682045a4
+Author: Dr. Stephen Henson <steve@openssl.org>
+Date:   Fri May 16 13:00:45 2014 +0100
+
+    Fix CVE-2014-0221
+    
+    Unnecessary recursion when receiving a DTLS hello request can be used to
+    crash a DTLS client. Fixed by handling DTLS hello request without recursion.
+    
+    Thanks to Imre Rad (Search-Lab Ltd.) for discovering this issue.
+
+Patch borrowed from Fedora
+Upstream-Status: Backport
+Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
+
+diff --git a/ssl/d1_both.c b/ssl/d1_both.c
+index 07f67f8..4c2fd03 100644
+--- a/ssl/d1_both.c
++++ b/ssl/d1_both.c
+@@ -793,6 +793,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
+        int i,al;
+        struct hm_header_st msg_hdr;
+ 
++       redo:
+        /* see if we have the required fragment already */
+        if ((frag_len = dtls1_retrieve_buffered_fragment(s,max,ok)) || *ok)
+                {
+@@ -851,8 +852,7 @@ dtls1_get_message_fragment(SSL *s, int st1, int stn, long max, int *ok)
+                                        s->msg_callback_arg);
+                        
+                        s->init_num = 0;
+-                       return dtls1_get_message_fragment(s, st1, stn,
+-                               max, ok);
++                       goto redo;
+                        }
+                else /* Incorrectly formated Hello request */
+                        {
+
diff --git a/meta/recipes-connectivity/openssl/openssl_1.0.1e.bb b/meta/recipes-connectivity/openssl/openssl_1.0.1e.bb
index 25dc1856c6..738f085059 100644
--- a/meta/recipes-connectivity/openssl/openssl_1.0.1e.bb
+++ b/meta/recipes-connectivity/openssl/openssl_1.0.1e.bb
@@ -38,6 +38,7 @@ SRC_URI += "file://configure-targets.patch \
             file://CVE-2014-0160.patch \
             file://openssl-1.0.1e-cve-2014-0195.patch \
             file://openssl-1.0.1e-cve-2014-0198.patch \
+            file://openssl-1.0.1e-cve-2014-0221.patch \
            "
 
 SRC_URI[md5sum] = "66bf6f10f060d561929de96f9dfe5b8c"