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Threat from router to connected device

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#1 cyberhash


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Posted 03 June 2015 - 02:31 PM

I have a few questions I was looking for help on; 
If you connected via an Ethernet cable to a compromised router (previously had malware attack carried out on it) would it be possible for the connected computer to be infected by the malware held in the router?
Further to this what other risks are there connecting to a compromised router via an ethernet cable? 
An important point here would be that the connection to the router would not be in order to browse the internet, the connection would be to download the data logs held in the router.
Any help available would be greatly appreciated.

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#2 quietman7


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Posted 03 June 2015 - 03:19 PM

Routers can be compromised if they have a weak or default password which attackers can easily guess or break using a dictionary attack or brute force attack. Malware which can modify routers are rare and may require the router to be a specific make, model and firmware revision. The most common was the DNSChanger Trojan which compromised the router's weak default password using brute-force attacks. The Trojan then changed the router's DNS table to malicious DNS servers...redirecting Domain Name resolutions to unsolicited, illegal and malicious sites the attacker wanted victims to access.

...Some DNS changer Trojans can alter routers' DNS settings via brute-force attacks. As a result, all systems connected to the "infected" router also become infected. Some DNS changer Trojans can also be used to set up rogue Dynamic Host Configuration Protocol (DHCP) servers on certain networks, which can have the same effect.

How DNS Changer Trojans Direct Users to Threats
Millions Of Home Routers Vulnerable To Web Hack
Malware Silently Alters Wireless Router Settings

Some routers have known vulnerabilities which can be exploited to open them up to attacks without needing to know the proper password. There have been various reports of vulnerabilities and attacks against hardware devices such as routers and data storage. For example, Ars Technica reported that ASUS routers and any storage devices attached to them may be exposed to anyone online without the need of login credentials if users have taken advantage of remote access features built into the routers. Linksys routers have been reported to be vulnerable to a simple exploit that could give an attacker remote access to the router.
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#3 mremski


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Posted 04 June 2015 - 03:45 AM

I'd disconnect the WAN side of the router, make sure nothing but the one PC is connected, use a Linux LiveCD so you're not running off the connected PC desktop to minimize potential for any damage.


I'd guess that most exploited routers merely are a gateway for bad actions, not a repository to attack connected devices.

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