Disable Telnet! Cisco Finds 0-Day Inward Cia Dump Affecting Over 300 Network Switch Models

Cisco is alarm of a novel critical zero-day IOS / IOS XE vulnerability that affects to a greater extent than than 300 of its switch models.

The fellowship identified this highest score of vulnerability inward its production piece analyzing "Vault 7" — a roughly 8,761 documents in addition to files leaked past times Wikileaks terminal week, claiming to detail hacking tools in addition to tactics of the Central Intelligence Agency (CIA).

The vulnerability resides inward the Cluster Management Protocol (CMP) processing code inward Cisco IOS in addition to Cisco IOS XE Software.

If exploited, the flaw (CVE-2017-3881) could allow an unauthenticated, remote assaulter to elbow grease a reboot of an affected device or remotely execute malicious code on the device alongside elevated privileges to convey amount command of the device, Cisco says inward its advisory.

The CMP protocol has been designed to top unopen to data nearly switch clusters betwixt cluster members using Telnet or SSH.

The vulnerability is inward the default configuration of affected Cisco devices, fifty-fifty if the user doesn't configure whatever cluster configuration commands. The flaw tin survive exploited during Telnet session negotiation over either IPv4 or IPv6.

According to the Cisco researchers, this põrnikas occurs inward Telnet connections inside the CMP, due to 2 factors:

• The protocol doesn't confine the purpose of CMP-specific Telnet options exclusively to internal, local communications betwixt cluster members; instead, it accepts in addition to processes commands over whatever Telnet connexion to an affected device.
• The wrong processing of malformed CMP-specific Telnet options.

So, inward guild to exploit this vulnerability, an assaulter tin post "malformed CMP-specific Telnet options piece establishing a Telnet session alongside an affected Cisco device configured to stimulate got Telnet connections," researchers say.

This exploitation could allow the assaulter to remotely execute malicious code in addition to obtain amount command of the affected device or elbow grease a reload of the affected device.

Disable Telnet On Vulnerable Models — Patch is non Available Yet!

The vulnerability affects 264 Catalyst switches, 51 industrial Ethernet switches, in addition to iii other devices, which includes Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2/3 EtherSwitch Service Module, Enhanced Layer 2 EtherSwitch Service Module, ME 4924-10GE switch, IE Industrial Ethernet switches, RF Gateway 10, SM-X Layer 2/3 EtherSwitch Service Module, in addition to Gigabit Ethernet Switch Module (CGESM) for HP. (check complete list here)

Currently, this vulnerability is unpatched, in addition to until patches are available, Cisco recommends its users to disable the Telnet connexion to the switch devices inward favor of SSH.

The company's advisory doesn't verbalise nearly whatever working exploit using this flaw, only if there's one, tens of thousands, if non hundreds of thousands, of devices installed unopen to the Blue Planet await to stimulate got been at corking adventure for an unknown menstruum — Thanks to the CIA for belongings the flaw.

Cisco volition update its IOS Software Checker tool instantly equally shortly equally the patches come upward out.

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