Matt Caswell [Fri, 10 Apr 2015 15:49:33 +0000 (16:49 +0100)]
Fix ssl_get_prev_session overrun
If OpenSSL is configured with no-tlsext then ssl_get_prev_session can read
past the end of the ClientHello message if the session_id length in the
ClientHello is invalid. This should not cause any security issues since the
underlying buffer is 16k in size. It should never be possible to overrun by
that many bytes.
This is probably made redundant by the previous commit - but you can never be
too careful.
With thanks to Qinghao Tang for reporting this issue.
Matt Caswell [Fri, 10 Apr 2015 16:25:27 +0000 (17:25 +0100)]
Check for ClientHello message overruns
The ClientHello processing is insufficiently rigorous in its checks to make
sure that we don't read past the end of the message. This does not have
security implications due to the size of the underlying buffer - but still
needs to be fixed.
With thanks to Qinghao Tang for reporting this issue.
While *pval is usually a pointer in rare circumstances it can be a long
value. One some platforms (e.g. WIN64) where
sizeof(long) < sizeof(ASN1_VALUE *) this will write past the field.
*pval is initialised correctly in the rest of ASN1_item_ex_new so setting it
to NULL is unecessary anyway.
Thanks to Julien Kauffmann for reporting this issue.
Richard Levitte [Wed, 8 Apr 2015 17:26:11 +0000 (19:26 +0200)]
Have mkerr.pl treat already existing multiline string defs properly
Since source reformat, we ended up with some error reason string
definitions that spanned two lines. That in itself is fine, but we
sometimes edited them to provide better strings than what could be
automatically determined from the reason macro, for example:
{ERR_REASON(SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER),
"Peer haven't sent GOST certificate, required for selected ciphersuite"},
However, mkerr.pl didn't treat those two-line definitions right, and
they ended up being retranslated to whatever the macro name would
indicate, for example:
{ERR_REASON(SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER),
"No gost certificate sent by peer"},
Clearly not what we wanted. This change fixes this problem.
If a set of certificates is supplied to OCSP_basic_verify use those in
addition to any present in the OCSP response as untrusted CAs when
verifying a certificate chain.
Emilia Kasper [Wed, 4 Mar 2015 17:05:02 +0000 (09:05 -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>
Emilia Kasper [Fri, 27 Feb 2015 15:52:23 +0000 (16:52 +0100)]
PKCS#7: avoid NULL pointer dereferences with missing content
In PKCS#7, the ASN.1 content component is optional.
This typically applies to inner content (detached signatures),
however we must also handle unexpected missing outer content
correctly.
This patch only addresses functions reachable from parsing,
decryption and verification, and functions otherwise associated
with reading potentially untrusted data.
Correcting all low-level API calls requires further work.
CVE-2015-0289
Thanks to Michal Zalewski (Google) for reporting this issue.
Reviewed-by: Steve Henson <steve@openssl.org>
Conflicts:
crypto/pkcs7/pk7_doit.c
Fix segmentation violation when ASN1_TYPE_cmp is passed a boolean type. This
can be triggered during certificate verification so could be a DoS attack
against a client or a server enabling client authentication.
CVE-2015-0286
Reviewed-by: Richard Levitte <levitte@openssl.org>
Matt Caswell [Mon, 5 Jan 2015 11:30:03 +0000 (11:30 +0000)]
Re-align some comments after running the reformat script.
This should be a one off operation (subsequent invokation of the
script should not move them)
Matt Caswell [Wed, 21 Jan 2015 11:09:58 +0000 (11:09 +0000)]
indent has problems with comments that are on the right hand side of a line.
Sometimes it fails to format them very well, and sometimes it corrupts them!
This commit moves some particularly problematic ones.
Windows 8 SDKs complain that GetVersion() is deprecated.
We only use GetVersion like this:
(GetVersion() < 0x80000000)
which checks if the Windows version is NT based. Use a macro check_winnt()
which uses GetVersion() on older SDK versions and true otherwise.
(cherry picked from commit a4cc3c8041104896d51ae12ef7b678c31808ce52)
Conflicts:
apps/apps.c
crypto/bio/bss_log.c
Backported by Matt Caswell <matt@openssl.org> Reviewed-by: Tim Hudson <tjh@openss.org>
Fix typo in ssl3_get_cert_verify: we can only skip certificate verify
message if certificate is absent.
NB: OpenSSL 0.9.8 is NOT vulnerable to CVE-2015-0205 as it doesn't
support DH certificates and this typo prohibits skipping of
certificate verify message for sign only certificates anyway.
Matt Caswell [Sat, 3 Jan 2015 00:54:35 +0000 (00:54 +0000)]
Follow on from CVE-2014-3571. This fixes the code that was the original source
of the crash due to p being NULL. Steve's fix prevents this situation from
occuring - however this is by no means obvious by looking at the code for
dtls1_get_record. This fix just makes things look a bit more sane.
Conflicts:
ssl/d1_pkt.c
Reviewed-by: Dr Stephen Henson <steve@openssl.org>
Fix crash in dtls1_get_record whilst in the listen state where you get two
separate reads performed - one for the header and one for the body of the
handshake record.
CVE-2014-3571
Reviewed-by: Matt Caswell <matt@openssl.org>
Conflicts:
ssl/s3_pkt.c
Only allow ephemeral RSA keys in export ciphersuites.
OpenSSL clients would tolerate temporary RSA keys in non-export
ciphersuites. It also had an option SSL_OP_EPHEMERAL_RSA which
enabled this server side. Remove both options as they are a
protocol violation.
Thanks to Karthikeyan Bhargavan for reporting this issue.
(CVE-2015-0204) Reviewed-by: Matt Caswell <matt@openssl.org> Reviewed-by: Tim Hudson <tjh@openssl.org>
(cherry picked from commit 4b4c1fcc88aec8c9e001b0a0077d3cd4de1ed0e6)
By using non-DER or invalid encodings outside the signed portion of a
certificate the fingerprint can be changed without breaking the signature.
Although no details of the signed portion of the certificate can be changed
this can cause problems with some applications: e.g. those using the
certificate fingerprint for blacklists.
1. Reject signatures with non zero unused bits.
If the BIT STRING containing the signature has non zero unused bits reject
the signature. All current signature algorithms require zero unused bits.
2. Check certificate algorithm consistency.
Check the AlgorithmIdentifier inside TBS matches the one in the
certificate signature. NB: this will result in signature failure
errors for some broken certificates.
3. Check DSA/ECDSA signatures use DER.
Reencode DSA/ECDSA signatures and compare with the original received
signature. Return an error if there is a mismatch.
This will reject various cases including garbage after signature
(thanks to Antti Karjalainen and Tuomo Untinen from the Codenomicon CROSS
program for discovering this case) and use of BER or invalid ASN.1 INTEGERs
(negative or with leading zeroes).