FatPipe Networks WARP/IPVPN/MPVPN 10.2.2 Hidden Backdoor Account (Write Access)

Title: FatPipe Networks WARP/IPVPN/MPVPN 10.2.2 Hidden Backdoor Account (Write Access)
Advisory ID: ZSL-2021-5684
Type: Local/Remote
Impact: Security Bypass, System Access, DoS, Privilege Escalation
Risk: (5/5)
Release Date: 27.09.2021
Summary
FatPipe Networks invented the concept of router-clustering, which provides the highest level of reliability, redundancy, and speed of Internet traffic for Business Continuity and communications. FatPipe WARP achieves fault tolerance for companies by creating an easy method of combining two or more Internet connections of any kind over multiple ISPs. FatPipe utilizes all paths when the lines are up and running, dynamically balancing traffic over the multiple lines, and intelligently failing over inbound and outbound IP traffic when ISP services and/or components fail.

FatPipe IPVPN balances load and provides reliability among multiple managed and CPE based VPNs as well as dedicated private networks. FatPipe IPVPN can also provide you an easy low-cost migration path from private line, Frame or Point-to-Point networks. You can aggregate multiple private, MPLS and public networks without additional equipment at the provider's site.

FatPipe MPVPN, a patented router clustering device, is an essential part of Disaster Recovery and Business Continuity Planning for Virtual Private Network (VPN) connectivity. It makes any VPN up to 900% more secure and 300% times more reliable, redundant and faster. MPVPN can take WANs with an uptime of 99.5% or less and make them 99.999988% or higher, providing a virtually infallible WAN. MPVPN dynamically balances load over multiple lines and ISPs without the need for BGP programming. MPVPN aggregates up to 10Gbps - 40Gbps of bandwidth, giving you all the reliability and speed you need to keep your VPN up and running despite failures of service, line, software, or hardware.
Description
The application has a hidden administrative account 'cmuser' that has no password and has write access permissions to the device. The user cmuser is not visible in Users menu list of the application.
Vendor
FatPipe Networks Inc. - https://www.fatpipeinc.com
Affected Version
WARP / IPVPN / MPVPN
10.2.2r38
10.2.2r25
10.2.2r10
10.1.2r60p82
10.1.2r60p71
10.1.2r60p65
10.1.2r60p58s1
10.1.2r60p58
10.1.2r60p55
10.1.2r60p45
10.1.2r60p35
10.1.2r60p32
10.1.2r60p13
10.1.2r60p10
9.1.2r185
9.1.2r180p2
9.1.2r165
9.1.2r164p5
9.1.2r164p4
9.1.2r164
9.1.2r161p26
9.1.2r161p20
9.1.2r161p17
9.1.2r161p16
9.1.2r161p12
9.1.2r161p3
9.1.2r161p2
9.1.2r156
9.1.2r150
9.1.2r144
9.1.2r129
7.1.2r39
6.1.2r70p75-m
6.1.2r70p45-m
6.1.2r70p26
5.2.0r34
Tested On
Apache-Coyote/1.1
Vendor Status
[30.05.2016] Vulnerability discovered.
[25.07.2021] Vulnerability discovered.
[25.07.2021] Vendor contacted.
[27.07.2021] No response from the vendor.
[28.07.2021] Vendor contacted.
[06.08.2021] No response from the vendor.
[07.08.2021] Vendor contacted.
[09.08.2021] CISA contacted.
[09.08.2021] CISA asks for more details.
[09.08.2021] Sent details to CISA.
[10.08.2021] CISA asked if the vulnerabilities were previously reported and which contacts did ZSL used initially.
[10.08.2021] Replied to CISA.
[10.08.2021] CISA will reach out to the vendor.
[16.08.2021] Asked CISA for status update.
[17.08.2021] CISA responds that the vendor replied and is reviewing the information.
[17.08.2021] CISA responds, vendor pushed updates to address the reported issues.
[17.08.2021] Replied to CISA, asked for patch release plan and coordination of advisory release.
[18.08.2021] Working with CISA and FatPipe.
[20.08.2021] Vendor released advisory: https://www.fatpipeinc.com/support/advisories.php
[23.08.2021] Working with the vendor.
[24.08.2021] Sent draft advisories to vendor. Asked for fixed version number. Informed that the advisories will be released mid September.
[25.08.2021] Asked vendor for confirmation of PoCs receipt.
[30.08.2021] Further discussion with the vendor about the vulnerabilities.
[07.09.2021] Asked vendor for status update.
[10.09.2021] Vendor requests more details.
[10.09.2021] Provided further details to the vendor.
[14.09.2021] Informed the vendor that advisories will be released 27th September.
[19.09.2021] Informed CISA about our release plan.
[27.09.2021] Coordinated public security advisory released.
[27.09.2021] Vendor provides fixed versions 10.1.2r60p92 and 10.2.2r43, and for 9.1.2: 9.1.2r161p31 and 9.1.2r180p9.
PoC
fatpipe_backdoor.txt
Credits
Vulnerability discovered by Gjoko Krstic - <gjoko@zeroscience.mk>
References
[1] https://www.fatpipeinc.com/support/advisories.php
[2] https://www.exploit-db.com/exploits/50341
[3] https://packetstormsecurity.com/files/164322/
[4] https://cxsecurity.com/issue/WLB-2021090146
[5] https://exchange.xforce.ibmcloud.com/vulnerabilities/210328
[6] https://www.nsa.gov/Press-Room/Press-Releases-Statements/Press-Release-View/Article/2791320/nsa-cisa-release-guidance-on-selecting-and-hardening-remote-access-vpns/
Changelog
[27.09.2021] - Initial release
[30.09.2021] - Added reference [2], [3], [4], [5] and [6]
Contact
Zero Science Lab

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