Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Network Security

1/31/2019
08:00 AM
Larry Loeb
Larry Loeb
Larry Loeb
50%
50%

Is Your Cisco Router Leaving Your Enterprise Vulnerable?

If your network uses Cisco's RV320 or RV325 Dual Gigabit WAN VPN routers, you are already under attack.

If your network uses Cisco's RV320 or RV325 Dual Gigabit WAN VPN routers, you are already under attack, whether you have realized it or not. The two routers are popular among Internet service providers and large enterprises.

There are two major vulnerabilities affecting these routers. One is a command injection (CVE-2019-1652) and the other an information disclosure (CVE-2019-1653).

CVE-2019-1653 requires no authentication, so a remote attacker can easily retrieve sensitive information including the router's configuration file, which includes MD5 hashed credentials as well as diagnostic information.

If the two are chained together by an attacker, they may obtain the hashed access credentials for a privileged account which then could give them the ability to run arbitrary commands as root.

German company RedTeam Pentesting first found these vulnerabilities in the routers, and reported them to Cisco. Cisco then issued a firmware update to mitigate the situation, along with an advisory.

In the advisory, Cisco stated the problem as "The vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending malicious HTTP POST requests to the web-based management interface of an affected device. A successful exploit could allow the attacker to execute arbitrary commands on the underlying Linux shell as root."

Cisco also says there are no workarounds for this.

Firmware Releases 1.4.2.15 through 1.4.2.19. are affected by these vulnerabilities.

However, there are already exploits on GitHub (one by David Davidson) that can serve as framework for an attack.

One of them can exploit CVE-2019-1653 and retrieve the configuration file from the router as well as the diagnostic information. This information includes hashed credentials for the router, which are hashed using MD5.

The md5 hash is md5($password.$auth_key), with the auth_key being a static value that can be simply discerned through the running of 'GET /' and parsing the output.

Threat actors are hoping that patching efforts will lag, and are racing to find those routers that are vulnerable.

Troy Mursch, a researcher from security firm Bad Packets, has found evidence of scans looking for these particular routers, and is trying to see which ones of the over 9,600 worldwide routers might be exploited. 6,247 were found to be Cisco RV320 routers, and 3,410 are Cisco RV325 routers.

He got the target number (out of the 20,000 that would show up in a Shodan search) through the use of BinaryEdge, a search engine for Internet-connected devices.

Most of these routers are located in use by US Internet service providers, according to a map that Mursh generated.

If you have not applied the update to the firmware, an emergency response might be to change their router's admin and WiFi credentials as well as assuming that you have already been compromised.

— Larry Loeb has written for many of the last century's major "dead tree" computer magazines, having been, among other things, a consulting editor for BYTE magazine and senior editor for the launch of WebWeek.

Comment  | 
Print  | 
More Insights
Comments
Threaded  |  Newest First  |  Oldest First
COVID-19: Latest Security News & Commentary
Dark Reading Staff 8/10/2020
Researcher Finds New Office Macro Attacks for MacOS
Curtis Franklin Jr., Senior Editor at Dark Reading,  8/7/2020
Exploiting Google Cloud Platform With Ease
Dark Reading Staff 8/6/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win an Amazon Gift Card! Click Here
Latest Comment: They said you could use Zoom anywhere.......
Current Issue
Special Report: Computing's New Normal, a Dark Reading Perspective
This special report examines how IT security organizations have adapted to the "new normal" of computing and what the long-term effects will be. Read it and get a unique set of perspectives on issues ranging from new threats & vulnerabilities as a result of remote working to how enterprise security strategy will be affected long term.
Flash Poll
The Changing Face of Threat Intelligence
The Changing Face of Threat Intelligence
This special report takes a look at how enterprises are using threat intelligence, as well as emerging best practices for integrating threat intel into security operations and incident response. Download it today!
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-13285
PUBLISHED: 2020-08-13
For GitLab before 13.0.12, 13.1.6, 13.2.3 a cross-site scripting vulnerability exists in the issue reference number tooltip.
CVE-2020-16087
PUBLISHED: 2020-08-13
An issue was discovered in Zalo.exe in VNG Zalo Desktop 19.8.1.0. An attacker can run arbitrary commands on a remote Windows machine running the Zalo client by sending the user of the device a crafted file.
CVE-2020-17463
PUBLISHED: 2020-08-13
FUEL CMS 1.4.7 allows SQL Injection via the col parameter to /pages/items, /permissions/items, or /navigation/items.
CVE-2019-16374
PUBLISHED: 2020-08-13
Pega Platform 8.2.1 allows LDAP injection because a username can contain a * character and can be of unlimited length. An attacker can specify four characters of a username, followed by the * character, to bypass access control.
CVE-2020-13280
PUBLISHED: 2020-08-13
For GitLab before 13.0.12, 13.1.6, 13.2.3 a memory exhaustion flaw exists due to excessive logging of an invite email error message.