- fix three security issues in gnutls handshake - GNUTLS-SA-2008-1
(#447461, #447462, #447463)
This commit is contained in:
Tomáš Mráz
parent
0c2a289f4e
commit
7eaa87392c
98
gnutls-1.4.1-sa-2008-1.patch
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98
gnutls-1.4.1-sa-2008-1.patch
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@ -0,0 +1,98 @@
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diff -up gnutls-1.4.1/lib/ext_server_name.c.sa-2008-1 gnutls-1.4.1/lib/ext_server_name.c
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--- gnutls-1.4.1/lib/ext_server_name.c.sa-2008-1 2006-03-08 11:44:59.000000000 +0100
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+++ gnutls-1.4.1/lib/ext_server_name.c 2008-05-20 09:52:13.000000000 +0200
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@@ -74,10 +74,27 @@ _gnutls_server_name_recv_params (gnutls_
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len = _gnutls_read_uint16 (p);
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p += 2;
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- DECR_LENGTH_RET (data_size, len, 0);
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- server_names++;
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+ if (len > 0)
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+ {
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+ DECR_LENGTH_RET (data_size, len, 0);
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+ server_names++;
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+ p += len;
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+ }
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+ else
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+ _gnutls_handshake_log
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+ ("HSK[%x]: Received zero size server name (under attack?)\n",
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+ session);
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- p += len;
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+ }
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+
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+ /* we cannot accept more server names.
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+ */
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+ if (server_names > MAX_SERVER_NAME_EXTENSIONS)
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+ {
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+ _gnutls_handshake_log
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+ ("HSK[%x]: Too many server names received (under attack?)\n",
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+ session);
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+ server_names = MAX_SERVER_NAME_EXTENSIONS;
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}
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session->security_parameters.extensions.server_names_size =
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@@ -85,10 +102,6 @@ _gnutls_server_name_recv_params (gnutls_
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if (server_names == 0)
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return 0; /* no names found */
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- /* we cannot accept more server names.
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- */
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- if (server_names > MAX_SERVER_NAME_EXTENSIONS)
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- server_names = MAX_SERVER_NAME_EXTENSIONS;
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p = data + 2;
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for (i = 0; i < server_names; i++)
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diff -up gnutls-1.4.1/lib/gnutls_handshake.c.sa-2008-1 gnutls-1.4.1/lib/gnutls_handshake.c
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--- gnutls-1.4.1/lib/gnutls_handshake.c.sa-2008-1 2006-04-17 18:32:16.000000000 +0200
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+++ gnutls-1.4.1/lib/gnutls_handshake.c 2008-05-20 09:52:13.000000000 +0200
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@@ -929,6 +929,14 @@ _gnutls_recv_handshake_header (gnutls_se
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*recv_type = session->internals.handshake_header_buffer.recv_type;
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+ if (*recv_type != type)
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+ {
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+ gnutls_assert ();
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+ _gnutls_handshake_log
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+ ("HSK[%x]: Handshake type mismatch (under attack?)\n", session);
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+ return GNUTLS_E_UNEXPECTED_HANDSHAKE_PACKET;
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+ }
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+
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return session->internals.handshake_header_buffer.packet_length;
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}
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diff -up gnutls-1.4.1/lib/gnutls_cipher.c.sa-2008-1 gnutls-1.4.1/lib/gnutls_cipher.c
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--- gnutls-1.4.1/lib/gnutls_cipher.c.sa-2008-1 2006-03-08 11:44:59.000000000 +0100
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+++ gnutls-1.4.1/lib/gnutls_cipher.c 2008-05-20 09:52:48.000000000 +0200
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@@ -445,7 +445,6 @@ _gnutls_ciphertext2compressed (gnutls_se
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return GNUTLS_E_INTERNAL_ERROR;
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}
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-
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/* actual decryption (inplace)
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*/
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switch (_gnutls_cipher_is_block
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@@ -496,17 +495,20 @@ _gnutls_ciphertext2compressed (gnutls_se
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pad = ciphertext.data[ciphertext.size - 1] + 1; /* pad */
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- length = ciphertext.size - hash_size - pad;
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-
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- if (pad > ciphertext.size - hash_size)
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+ if ((int)pad > (int)ciphertext.size - hash_size)
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{
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gnutls_assert ();
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+ _gnutls_record_log
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+ ("REC[%x]: Short record length %d > %d - %d (under attack?)\n",
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+ session, pad, ciphertext.size, hash_size);
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/* We do not fail here. We check below for the
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* the pad_failed. If zero means success.
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*/
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pad_failed = GNUTLS_E_DECRYPTION_FAILED;
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}
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+ length = ciphertext.size - hash_size - pad;
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+
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/* Check the pading bytes (TLS 1.x)
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*/
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if (ver >= GNUTLS_TLS1 && pad_failed == 0)
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@ -1,7 +1,7 @@
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Summary: A TLS protocol implementation
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Name: gnutls
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Version: 2.0.4
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Release: 2%{?dist}
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Release: 3%{?dist}
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# The libgnutls library is LGPLv2+, utilities and remaining libraries are GPLv2+
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License: GPLv2+ and LGPLv2+
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Group: System Environment/Libraries
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@ -15,6 +15,7 @@ URL: http://www.gnutls.org/
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Source0: %{name}-%{version}-nosrp.tar.bz2
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Source1: libgnutls-config
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Patch0: gnutls-2.0.4-nosrp.patch
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Patch4: gnutls-1.4.1-sa-2008-1.patch
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BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
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Requires: libgcrypt >= 1.2.2
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@ -56,6 +57,7 @@ manipulation tools.
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%prep
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%setup -q
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%patch0 -p1 -b .nosrp
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%patch4 -p1 -b .sa-2008-1
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for i in auth_srp_rsa.c auth_srp_sb64.c auth_srp_passwd.c auth_srp.c gnutls_srp.c ext_srp.c; do
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touch lib/$i
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@ -124,6 +126,10 @@ fi
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%{_mandir}/man1/*
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%changelog
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* Tue May 20 2008 Tomas Mraz <tmraz@redhat.com> 2.0.4-3
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- fix three security issues in gnutls handshake - GNUTLS-SA-2008-1
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(#447461, #447462, #447463)
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* Mon Feb 4 2008 Joe Orton <jorton@redhat.com> 2.0.4-2
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- use system libtasn1
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