D-Link DWR-932B SSH Service backdoor

Summaryinfo

A vulnerability marked as critical has been reported in D-Link DWR-932B. Impacted is an unknown function of the component SSH Service. Performing a manipulation results in backdoor. Furthermore, there is an exploit available. It is suggested to update the configuration settings.

Detailsinfo

A vulnerability was found in D-Link DWR-932B (the affected version is unknown). It has been classified as critical. This affects an unknown code of the component SSH Service. The manipulation with an unknown input leads to a backdoor vulnerability. CWE is classifying the issue as CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. This is going to have an impact on confidentiality, integrity, and availability.

The bug was discovered 12/04/2015. The weakness was shared 09/28/2016 by Pierre Kim as not defined mailinglist post (Bugtraq). The advisory is shared at seclists.org. The exploitability is told to be easy. It is possible to initiate the attack remotely. A authentication is needed for exploitation. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1588.001 for this issue. The reason for this vulnerability is this part of code:

#Sandro { for telnetd debug...
start-stop-daemon -S -b -a /bin/logmaster
#if [ -e /config2/telnetd ]; then
		start-stop-daemon -S -b -a /sbin/telnetd
#fi
#Sandro }

A public exploit has been developed by Pierre Kim and been published immediately after the advisory. The exploit is shared for download at packetstormsecurity.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 299 days. During that time the estimated underground price was around $25k-$100k.

It is possible to mitigate the problem by applying the configuration setting .It is possible to mitigate the weakness by firewalling tcp/22 (ssh). The best possible mitigation is suggested to be the change of configuration settings.

The entries VDB-92228, VDB-92230, VDB-92231 and VDB-92232 are related to this item. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• D-Link

Name

• DWR-932B

License

• commercial

Website

• Vendor: https://www.dlink.com/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

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Exploitinginfo

Threat Intelligenceinfo

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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