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

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When a SSH2_MSG_OPEN_FAILURE 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 14:37:40 +02:00
committed by Andreas Schneider
parent 3837a0547f
commit e5ff7aa410
1 changed files with 11 additions and 0 deletions
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11
src/channels.c
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@@ -219,6 +219,14 @@ SSH_PACKET_CALLBACK(ssh_packet_channel_open_fail){
return SSH_PACKET_USED;
}
if (channel->state != SSH_CHANNEL_STATE_OPENING) {
SSH_LOG(SSH_LOG_RARE,
"SSH2_MSG_CHANNEL_OPEN_FAILURE received in incorrect channel "
"state %d",
channel->state);
goto error;
}
ssh_set_error(session, SSH_REQUEST_DENIED,
"Channel opening failure: channel %u error (%lu) %s",
channel->local_channel,
@@ -226,6 +234,9 @@ SSH_PACKET_CALLBACK(ssh_packet_channel_open_fail){
error);
SAFE_FREE(error);
channel->state=SSH_CHANNEL_STATE_OPEN_DENIED;
error:
ssh_set_error(session, SSH_FATAL, "Invalid packet");
return SSH_PACKET_USED;
}