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Sangoma NetBorder / Vega Session Controller Remote Command Execution

Sangoma NetBorder / Vega Session Controller Remote Command Execution
Posted Jan 11, 2018
Authored by Appsecco Security Team | Site appsecco.com

Sangoma NetBorder / Vega Session Controller versions prior to 2.3.12-80-GA allows remote unauthenticated attackers to execute arbitrary commands via the web interface.

tags | exploit, remote, web, arbitrary
MD5 | 36a49fe20eb6acbd86755f5f716ec2c1

Sangoma NetBorder / Vega Session Controller Remote Command Execution

Change Mirror Download
## Description

Sangoma NetBorder / Vega Session Controller before 2.3.12-80-GA allows remote unauthenticated attackers to execute arbitrary commands via the web interface.

## Technical Details

The `ShellExec` class implemented in `api/ShellExec.class.php` is extensively used by various PHP scripts in the management web application to invoke external command line programs. The `Execute` method in this class invokes external programs, optionally with `sudo` for privileged execution. Unfortunately this method does not implement any input validation or parameter escaping which can be exploited to inject and execute arbitrary shell commands.

During our research, we exploited the `login` functionality in the web app to inject and execute arbitrary shell commands when `/usr/local/sng/bin/sng-user-mgmt` was invoked to verify provided credentials.

Following code is executed to authenticate a user from web ui:

```
1197 $shell = new ShellExec();
1198 $cmd = '/usr/local/sng/bin/sng-user-mgmt';
[...]
1204 $args =' --action=login --user='.$username.' --encrypted-password="' . $string.'"';
1205 $rc = $shell->Execute($cmd, $args, true, array('log'));
1206 if(0 == $rc){
[...]
1217 $_SESSION['user_login'] = $username;
1218 $_SESSION['system_login'] = "root";
1219 WebSetSessionAuthenticated();
1220 return true;
```

Example payload during login to achieve command execution:

```
username: a;echo A > /tmp/test.txt;
password: anything
```

This results in creation of `/tmp/test.txt` on the server.

## Vendor Response

This issue has been responsibly disclosed to the vendor for which a patch has been released.
ftp://ftp.sangoma.com/nsc/2.3/Changelog

## Credits

Appsecco Security Team
http://www.appsecco.com

## Timeline

2017-12-05: Discovered and reported to vendor
2017-12-06: Vendor confirmation
2017-12-07: Fixed version (2.3.12) released



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