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add size checking to binary packets in Net/SSH2.php (thanks ?????? ????????!)

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terrafrost 2013-01-26 00:17:23 -06:00
parent 111544428e
commit e7336e6b54
1 changed files with 9 additions and 0 deletions
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9
phpseclib/Net/SSH2.php
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@ -2060,6 +2060,15 @@ class Net_SSH2 {
extract(unpack('Npacket_length/Cpadding_length', $this->_string_shift($raw, 5)));
$remaining_length = $packet_length + 4 - $this->decrypt_block_size;
// quoting <http://tools.ietf.org/html/rfc4253#section-6.1>,
// "implementations SHOULD check that the packet length is reasonable"
// PuTTY uses 0x9000 as the actual max packet size and so to shall we
if ($remaining_length < -$this->decrypt_block_size || $remaining_length > 0x9000 || $remaining_length % $this->decrypt_block_size != 0) {
user_error('Invalid size');
return false;
}
$buffer = '';
while ($remaining_length > 0) {
$temp = fread($this->fsock, $remaining_length);