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Move rsa_key initialization in front of load_config().
If loading the config fails, rsa_key isn't initialized and may
cause invalid free() in the end: cleanup.
Remove superfluous memset.
Reviewed-by: Andy Polyakov <appro@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit c003851783ed05e3fd5296786e1f8f6a63dc4f31)
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GH issue #1916 affects only big-endian platforms. TLS is not affected,
because TLS fragment is never big enough.
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 76f572ed0469a277d92378848250b7a9705d3071)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1849)
(cherry picked from commit 1e62cc12f35408508594be254f40bf9b65d2a3a9)
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Forks will have to define their own
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1821)
(cherry picked from commit 5e28b1c1e048eef600dc49820934a5e1531186d4)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1625)
(cherry picked from commit e4d94269a5a41594852dc60716500580f1d47cef)
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A temporary buffer containing g^xy was not cleared in ecdh_compute_key()
before freeing it, so the shared secret was leaked in memory.
Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 0e4690165b4beb6777b747b0aeb1646a301f41d9)
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The SWEET32 fix moved 3DES from HIGH to MEDIUM, but omitted SSL2.
CLA: trivial
Reviewed-by: Kurt Roeckx <kurt@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1683)
(cherry picked from commit 6d69dc56de8f0535be9ccabea7a8d4e61c04c2f1)
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Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/1702)
(cherry picked from commit 7954dced19a7e59e7055eab95a981fa943c7d100)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
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Reviewed-by: Richard Levitte <levitte@openssl.org>
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Reviewed-by: Richard Levitte <levitte@openssl.org>
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Russian GOST ciphersuites are vulnerable to the KCI attack because they use
long-term keys to establish the connection when ssl client authorization is
on. This change brings the GOST implementation into line with the latest
specs in order to avoid the attack. It should not break backwards
compatibility.
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
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A malicious client can send an excessively large OCSP Status Request
extension. If that client continually requests renegotiation,
sending a large OCSP Status Request extension each time, then there will
be unbounded memory growth on the server. This will eventually lead to a
Denial Of Service attack through memory exhaustion. Servers with a
default configuration are vulnerable even if they do not support OCSP.
Builds using the "no-ocsp" build time option are not affected.
I have also checked other extensions to see if they suffer from a similar
problem but I could not find any other issues.
CVE-2016-6304
Issue reported by Shi Lei.
Reviewed-by: Rich Salz <rsalz@openssl.org>
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Reviewed-by: Rich Salz <rsalz@openssl.org>
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Grow TLS/DTLS 16 bytes more than strictly necessary as a precaution against
OOB reads. In most cases this will have no effect because the message buffer
will be large enough already.
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 006a788c84e541c8920dd2ad85fb62b52185c519)
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Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit bc9563f83d28342b5ec0073ec12d9e581e4f3317)
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The overflow check will never be triggered because the
the n2l3 result is always less than 2^24.
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 709ec8b3848e2ac201b86f49c5561debb8572ccd)
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In ssl3_get_client_certificate, ssl3_get_server_certificate and
ssl3_get_certificate_request check we have enough room
before reading a length.
Thanks to Shi Lei (Gear Team, Qihoo 360 Inc.) for reporting these bugs.
CVE-2016-6306
Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit ff553f837172ecb2b5c8eca257ec3c5619a4b299)
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Commit d8e8590e ("Fix missing return value checks in SCTP") made the
DTLS handshake fail, even for non-SCTP connections, if
SSL_export_keying_material() fails. Which it does, for DTLS1_BAD_VER.
Apply the trivial fix to make it succeed, since there's no real reason
why it shouldn't even though we never need it.
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit c8a18468caef4d62778381be0acdadc8a88d6e51)
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Thanks to Shi Lei for reporting this issue.
CVE-2016-6303
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 55d83bf7c10c7b205fffa23fa7c3977491e56c07)
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Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>
(cherry picked from commit 0fff5065884d5ac61123a604bbcee30a53c808ff)
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If a ticket callback changes the HMAC digest to SHA512 the existing
sanity checks are not sufficient and an attacker could perform a DoS
attack with a malformed ticket. Add additional checks based on
HMAC size.
Thanks to Shi Lei for reporting this bug.
CVE-2016-6302
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit baaabfd8fdcec04a691695fad9a664bea43202b6)
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Fix an off by one error in the overflow check added by 07bed46f332fc
("Check for errors in BN_bn2dec()").
Reviewed-by: Stephen Henson <steve@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 099e2968ed3c7d256cda048995626664082b1b30)
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Follow on from CVE-2016-2179
The investigation and analysis of CVE-2016-2179 highlighted a related flaw.
This commit fixes a security "near miss" in the buffered message handling
code. Ultimately this is not currently believed to be exploitable due to
the reasons outlined below, and therefore there is no CVE for this on its
own.
The issue this commit fixes is a MITM attack where the attacker can inject
a Finished message into the handshake. In the description below it is
assumed that the attacker injects the Finished message for the server to
receive it. The attack could work equally well the other way around (i.e
where the client receives the injected Finished message).
The MITM requires the following capabilities:
- The ability to manipulate the MTU that the client selects such that it
is small enough for the client to fragment Finished messages.
- The ability to selectively drop and modify records sent from the client
- The ability to inject its own records and send them to the server
The MITM forces the client to select a small MTU such that the client
will fragment the Finished message. Ideally for the attacker the first
fragment will contain all but the last byte of the Finished message,
with the second fragment containing the final byte.
During the handshake and prior to the client sending the CCS the MITM
injects a plaintext Finished message fragment to the server containing
all but the final byte of the Finished message. The message sequence
number should be the one expected to be used for the real Finished message.
OpenSSL will recognise that the received fragment is for the future and
will buffer it for later use.
After the client sends the CCS it then sends its own Finished message in
two fragments. The MITM causes the first of these fragments to be
dropped. The OpenSSL server will then receive the second of the fragments
and reassemble the complete Finished message consisting of the MITM
fragment and the final byte from the real client.
The advantage to the attacker in injecting a Finished message is that
this provides the capability to modify other handshake messages (e.g.
the ClientHello) undetected. A difficulty for the attacker is knowing in
advance what impact any of those changes might have on the final byte of
the handshake hash that is going to be sent in the "real" Finished
message. In the worst case for the attacker this means that only 1 in
256 of such injection attempts will succeed.
It may be possible in some situations for the attacker to improve this such
that all attempts succeed. For example if the handshake includes client
authentication then the final message flight sent by the client will
include a Certificate. Certificates are ASN.1 objects where the signed
portion is DER encoded. The non-signed portion could be BER encoded and so
the attacker could re-encode the certificate such that the hash for the
whole handshake comes to a different value. The certificate re-encoding
would not be detectable because only the non-signed portion is changed. As
this is the final flight of messages sent from the client the attacker
knows what the complete hanshake hash value will be that the client will
send - and therefore knows what the final byte will be. Through a process
of trial and error the attacker can re-encode the certificate until the
modified handhshake also has a hash with the same final byte. This means
that when the Finished message is verified by the server it will be
correct in all cases.
In practice the MITM would need to be able to perform the same attack
against both the client and the server. If the attack is only performed
against the server (say) then the server will not detect the modified
handshake, but the client will and will abort the connection.
Fortunately, although OpenSSL is vulnerable to Finished message
injection, it is not vulnerable if *both* client and server are OpenSSL.
The reason is that OpenSSL has a hard "floor" for a minimum MTU size
that it will never go below. This minimum means that a Finished message
will never be sent in a fragmented form and therefore the MITM does not
have one of its pre-requisites. Therefore this could only be exploited
if using OpenSSL and some other DTLS peer that had its own and separate
Finished message injection flaw.
The fix is to ensure buffered messages are cleared on epoch change.
Reviewed-by: Richard Levitte <levitte@openssl.org>
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DTLS can handle out of order record delivery. Additionally since
handshake messages can be bigger than will fit into a single packet, the
messages can be fragmented across multiple records (as with normal TLS).
That means that the messages can arrive mixed up, and we have to
reassemble them. We keep a queue of buffered messages that are "from the
future", i.e. messages we're not ready to deal with yet but have arrived
early. The messages held there may not be full yet - they could be one
or more fragments that are still in the process of being reassembled.
The code assumes that we will eventually complete the reassembly and
when that occurs the complete message is removed from the queue at the
point that we need to use it.
However, DTLS is also tolerant of packet loss. To get around that DTLS
messages can be retransmitted. If we receive a full (non-fragmented)
message from the peer after previously having received a fragment of
that message, then we ignore the message in the queue and just use the
non-fragmented version. At that point the queued message will never get
removed.
Additionally the peer could send "future" messages that we never get to
in order to complete the handshake. Each message has a sequence number
(starting from 0). We will accept a message fragment for the current
message sequence number, or for any sequence up to 10 into the future.
However if the Finished message has a sequence number of 2, anything
greater than that in the queue is just left there.
So, in those two ways we can end up with "orphaned" data in the queue
that will never get removed - except when the connection is closed. At
that point all the queues are flushed.
An attacker could seek to exploit this by filling up the queues with
lots of large messages that are never going to be used in order to
attempt a DoS by memory exhaustion.
I will assume that we are only concerned with servers here. It does not
seem reasonable to be concerned about a memory exhaustion attack on a
client. They are unlikely to process enough connections for this to be
an issue.
A "long" handshake with many messages might be 5 messages long (in the
incoming direction), e.g. ClientHello, Certificate, ClientKeyExchange,
CertificateVerify, Finished. So this would be message sequence numbers 0
to 4. Additionally we can buffer up to 10 messages in the future.
Therefore the maximum number of messages that an attacker could send
that could get orphaned would typically be 15.
The maximum size that a DTLS message is allowed to be is defined by
max_cert_list, which by default is 100k. Therefore the maximum amount of
"orphaned" memory per connection is 1500k.
Message sequence numbers get reset after the Finished message, so
renegotiation will not extend the maximum number of messages that can be
orphaned per connection.
As noted above, the queues do get cleared when the connection is closed.
Therefore in order to mount an effective attack, an attacker would have
to open many simultaneous connections.
Issue reported by Quan Luo.
CVE-2016-2179
Reviewed-by: Richard Levitte <levitte@openssl.org>
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Reviewed-by: Rich Salz <rsalz@openssl.org>
MR: #3176
(cherry picked from commit a73be798ced572a988d455d961a2387f6eccb549)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 2a9afa4046592d44af84644cd89fe1a0d6d46889)
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A function error code needed updating due to merge issues.
Reviewed-by: Richard Levitte <levitte@openssl.org>
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The DTLS implementation provides some protection against replay attacks
in accordance with RFC6347 section 4.1.2.6.
A sliding "window" of valid record sequence numbers is maintained with
the "right" hand edge of the window set to the highest sequence number we
have received so far. Records that arrive that are off the "left" hand
edge of the window are rejected. Records within the window are checked
against a list of records received so far. If we already received it then
we also reject the new record.
If we have not already received the record, or the sequence number is off
the right hand edge of the window then we verify the MAC of the record.
If MAC verification fails then we discard the record. Otherwise we mark
the record as received. If the sequence number was off the right hand edge
of the window, then we slide the window along so that the right hand edge
is in line with the newly received sequence number.
Records may arrive for future epochs, i.e. a record from after a CCS being
sent, can arrive before the CCS does if the packets get re-ordered. As we
have not yet received the CCS we are not yet in a position to decrypt or
validate the MAC of those records. OpenSSL places those records on an
unprocessed records queue. It additionally updates the window immediately,
even though we have not yet verified the MAC. This will only occur if
currently in a handshake/renegotiation.
This could be exploited by an attacker by sending a record for the next
epoch (which does not have to decrypt or have a valid MAC), with a very
large sequence number. This means the right hand edge of the window is
moved very far to the right, and all subsequent legitimate packets are
dropped causing a denial of service.
A similar effect can be achieved during the initial handshake. In this
case there is no MAC key negotiated yet. Therefore an attacker can send a
message for the current epoch with a very large sequence number. The code
will process the record as normal. If the hanshake message sequence number
(as opposed to the record sequence number that we have been talking about
so far) is in the future then the injected message is bufferred to be
handled later, but the window is still updated. Therefore all subsequent
legitimate handshake records are dropped. This aspect is not considered a
security issue because there are many ways for an attacker to disrupt the
initial handshake and prevent it from completing successfully (e.g.
injection of a handshake message will cause the Finished MAC to fail and
the handshake to be aborted). This issue comes about as a result of trying
to do replay protection, but having no integrity mechanism in place yet.
Does it even make sense to have replay protection in epoch 0? That
issue isn't addressed here though.
This addressed an OCAP Audit issue.
CVE-2016-2181
Reviewed-by: Richard Levitte <levitte@openssl.org>
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During a DTLS handshake we may get records destined for the next epoch
arrive before we have processed the CCS. In that case we can't decrypt or
verify the record yet, so we buffer it for later use. When we do receive
the CCS we work through the queue of unprocessed records and process them.
Unfortunately the act of processing wipes out any existing packet data
that we were still working through. This includes any records from the new
epoch that were in the same packet as the CCS. We should only process the
buffered records if we've not got any data left.
Reviewed-by: Richard Levitte <levitte@openssl.org>
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(cherry picked from commit a1be17a72f6e0fe98275dc113cddd799bf55df44)
Conflicts:
crypto/pem/pem_err.c
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Stephen Henson <steve@openssl.org>
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Apply a limit to the maximum blob length which can be read in do_d2i_bio()
to avoid excessive allocation.
Thanks to Shi Lei for reporting this.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 66bcba145740e4f1210499ba6e5033035a2a4647)
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If an oversize BIGNUM is presented to BN_bn2dec() it can cause
BN_div_word() to fail and not reduce the value of 't' resulting
in OOB writes to the bn_data buffer and eventually crashing.
Fix by checking return value of BN_div_word() and checking writes
don't overflow buffer.
Thanks to Shi Lei for reporting this bug.
CVE-2016-2182
Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 07bed46f332fce8c1d157689a2cdf915a982ae34)
Conflicts:
crypto/bn/bn_print.c
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Check for error return in BN_div_word().
Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 8b9afbc0fc7f8be0049d389d34d9416fa377e2aa)
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Thanks to Hanno Böck for reporting this bug.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 39a43280316f1b9c45be5ac5b04f4f5c3f923686)
Conflicts:
crypto/pkcs12/p12_utl.c
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Fix error path leaks in a2i_ASN1_STRING(), a2i_ASN1_INTEGER() and
a2i_ASN1_ENUMERATED().
Thanks to Shi Lei for reporting these issues.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit e1be1dce7722ee40ced16b1b91d5e1b9fce13d08)
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GH: #1322
Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Stephen Henson <steve@openssl.org>
(cherry picked from commit 32baafb2f6fb2a424824df08232d86765f554880)
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Thanks to Shi Lei for reporting this bug.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 81f69e5b69b8e87ca5d7080ab643ebda7808542c)
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Thanks to Shi Lei for reporting this issue.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit af601b83198771a4ad54ac0f415964b90aab4b5f)
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Use correct length in old ASN.1 indefinite length sequence decoder
(only used by SSL_SESSION).
This bug was discovered by Hanno Böck using libfuzzer.
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 436dead2e2a157fa501a7538a77b6078391b477f)
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Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 134ab5139a8d41455a81d9fcc31b3edb8a4b2f5c)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit e9f17097e9fbba3e7664cd67e54eebf2bd438863)
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Reviewed-by: Richard Levitte <levitte@openssl.org>
(cherry picked from commit 56f9953c846204cb3251ab27605e403c7444fd72)
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TS_OBJ_print_bio() misuses OBJ_txt2obj: it should print the result
as a null terminated buffer. The length value returned is the total
length the complete text reprsentation would need not the amount of
data written.
CVE-2016-2180
Thanks to Shi Lei for reporting this bug.
Reviewed-by: Matt Caswell <matt@openssl.org>
(cherry picked from commit 0ed26acce328ec16a3aa635f1ca37365e8c7403a)
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Ensure things really do get cleared when we intend them to.
Addresses an OCAP Audit issue.
Reviewed-by: Andy Polyakov <appro@openssl.org>
(cherry picked from commit cb5ebf961333896776fbce10ef88c2af7bec8aea)
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Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 6ad8c48291622a6ccc51489b9a230c9a05ca5614)
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While travelling up the certificate chain, the internal
proxy_path_length must be updated with the pCPathLengthConstraint
value, or verification will not work properly. This corresponds to
RFC 3820, 4.1.4 (a).
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 30aeb3128199c15760a785d88a4eda9e156d5af6)
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The subject name MUST be the same as the issuer name, with a single CN
entry added.
RT#1852
Reviewed-by: Rich Salz <rsalz@openssl.org>
(cherry picked from commit 338fb1688fbfb7efe0bdd475b01791a6de5ef94b)
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RAND_pseudo_bytes() allows random data to be returned even in low entropy
conditions. Sometimes this is ok. Many times it is not. For the avoidance
of any doubt, replace existing usage of RAND_pseudo_bytes() with
RAND_bytes().
Reviewed-by: Rich Salz <rsalz@openssl.org>
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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>
(cherry picked from commit b7d0f2834e139a20560d64c73e2565e93715ce2b)
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