Title: Secure Computing SnapGear Management Console SG560 v3.1.5 Arbitrary File Read/Write
Advisory ID: ZSL-2020-5568
Type: Local/Remote
Impact: Cross-Site Scripting, Manipulation of data, Exposure of system information, Exposure of sensitive information
Risk: (4/5)
Release Date: 04.06.2020

Summary

The SG gateway appliance range provides Internet security and privacy of communications for small and medium enterprises, and branch offices. It simply and securely connects your office to the Internet, and with its robust stateful firewall, shields your computers from external threats.

Description

The application allows the currently logged-in user to edit the configuration files in the system using the CGI executable 'edit_config_files' in /cgi-bin/cgix/. The files that are allowed to be modified (read/write/delete) are located in the /etc/config/ directory. An attacker can manipulate the POST request parameters to escape from the restricted environment by using absolute path and start reading, writing and deleting arbitrary files on the system.

Vendor

Secure Computing Corp. - http://www.securecomputing.com

Affected Version

3.1.5u1

Tested On

fnord/1.9
Apache 1.3.27 (Unix)
Linux 2.4.31

Vendor Status

N/A

PoC

sg560_rw.txt

Credits

Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>

References

[1] https://www.exploit-db.com/exploits/48556
[2] https://packetstormsecurity.com/files/157939
[3] https://exchange.xforce.ibmcloud.com/vulnerabilities/182960

Changelog

[04.06.2020] - Initial release
[05.06.2020] - Added reference [1], [2] and [3]

Contact

Zero Science Lab

Web: https://www.zeroscience.mk
e-mail: lab@zeroscience.mk