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CVE-2018-10933: Check channel state when OPEN_CONFIRMATION arrives

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When a SSH2_MSG_OPEN_CONFIRMATION arrives, the channel state is checked
to be in SSH_CHANNEL_STATE_OPENING.

Fixes T101

Signed-off-by: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>
This commit is contained in:
Anderson Toshiyuki Sasaki
2018-09-19 14:30:33 +02:00
committed by Andreas Schneider
parent 7985acb768
commit 3837a0547f
1 changed files with 9 additions and 0 deletions
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9
src/channels.c
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@@ -170,6 +170,15 @@ SSH_PACKET_CALLBACK(ssh_packet_channel_open_conf){
"Received a CHANNEL_OPEN_CONFIRMATION for channel %d:%d",
channel->local_channel,
channel->remote_channel);
if (channel->state != SSH_CHANNEL_STATE_OPENING) {
SSH_LOG(SSH_LOG_RARE,
"SSH2_MSG_CHANNEL_OPEN_CONFIRMATION received in incorrect "
"channel state %d",
channel->state);
goto error;
}
SSH_LOG(SSH_LOG_PROTOCOL,
"Remote window : %lu, maxpacket : %lu",
(long unsigned int) channel->remote_window,