318 models of Cisco switches contain a vulnerability that the CIA uses


    Vulnerable Cisco Catalyst 2960G-48TC-L Switch Photo: Cisco

    Cisco published information (Bulletin ID: cisco-sa-20170317-cmp) about a critical vulnerability in the Cluster Management Protocol (CMP) that comes with Cisco IOS XE Software. Vulnerability CVE-2017-3881 allows remote code execution with elevated privileges in the Cisco IOS internetwork operating system by any unauthorized remote user (who is aware of the bug).

    About him was precisely known to the CIA, which follows from the documents published on the site Wikileaks in the framework of the project Vault 7 (Year Zero). Cisco security experts say they have found vulnerability information by analyzing these documents.

    The CMP protocol is based on the telnet protocol , but supports specific parameters. The bug is associated with incorrect processing of these very specific CMP parameters, which are obtained via telnet. What specific parameters should be used to manifest a bug when processing a request is not reported.

    Cisco company publishes instructions on how to check for the presence of the CMP subsystem in the software that runs on the device.

    CMP Verification:

    show subsys class protocol | include ^cmp

    If the CMP subsystem is missing, the answer is: If the CMP subsystem is present, the response will be as follows:

    Switch#show subsys class protocol | include ^cmp
    Switch#




    Switch#show subsys class protocol | include ^cmp
    cmp Protocol 1.000.001
    Switch#


    If there is a CMP subsystem on your switch, you can check whether the CMP is accepting incoming telnet connections. And, accordingly, is it possible to carry out the aforementioned attack on him with the remote execution of the code by means of a specially formed command.

    Checking support for incoming telnet connections:

    show running-config | include ^line vty|transport input

    For example, if the default settings are used, the virtual terminal line (VTY) will simply indicate the terminal numbers without special notes: The default settings include incoming telnet connections on all virtual terminals 0 through 15 y. Therefore, this is a vulnerable configuration. For comparison, here is a special configuration where only the SSH protocol is allowed on all virtual terminals: Such a configuration will not be vulnerable.

    Switch#show running-config | include ^line vty|transport input
    line vty 0 4
    line vty 5 15
    Switch#






    Switch#show running-config | include ^line vty|transport input
    line vty 0 4
    transport input ssh
    line vty 5 15
    transport input ssh
    Switch#




    Cisco checked Cisco IOS XE Software versions and accurately determined the list of 318 switches and other network devices affected by this vulnerability. If the device is not listed, then it is definitely safe.

    The list includes 264 Catalyst series switches, 40 Industrial Industrial Ethernet switches and 14 other Cisco devices.

    Models of vulnerable devices
    • Cisco Catalyst 2350-48TD-S Switch
    • Cisco Catalyst 2350-48TD-SD Switch
    • Cisco Catalyst 2360-48TD-S Switch
    • Cisco Catalyst 2918-24TC-C Switch
    • Cisco Catalyst 2918-24TT-C Switch
    • Cisco Catalyst 2918-48TC-C Switch
    • Cisco Catalyst 2918-48TT-C Switch
    • Cisco Catalyst 2928-24TC-C Switch
    • Cisco Catalyst 2960-24-S Switch
    • Cisco Catalyst 2960-24LC-S Switch
    • Cisco Catalyst 2960-24LT-L Switch
    • Cisco Catalyst 2960-24PC-L Switch
    • Cisco Catalyst 2960-24PC-S Switch
    • Cisco Catalyst 2960-24TC-L Switch
    • Cisco Catalyst 2960-24TC-S Switch
    • Cisco Catalyst 2960-24TT-L Switch
    • Cisco Catalyst 2960-48PST-L Switch
    • Cisco Catalyst 2960-48PST-S Switch
    • Cisco Catalyst 2960-48TC-L Switch
    • Cisco Catalyst 2960-48TC-S Switch
    • Cisco Catalyst 2960-48TT-L Switch
    • Cisco Catalyst 2960-48TT-S Switch
    • Cisco Catalyst 2960-8TC-L Compact Switch
    • Cisco Catalyst 2960-8TC-S Compact Switch
    • Cisco Catalyst 2960-Plus 24LC-L Switch
    • Cisco Catalyst 2960-Plus 24LC-S Switch
    • Cisco Catalyst 2960-Plus 24PC-L Switch
    • Cisco Catalyst 2960-Plus 24PC-S Switch
    • Cisco Catalyst 2960-Plus 24TC-L Switch
    • Cisco Catalyst 2960-Plus 24TC-S Switch
    • Cisco Catalyst 2960-Plus 48PST-L Switch
    • Cisco Catalyst 2960-Plus 48PST-S Switch
    • Cisco Catalyst 2960-Plus 48TC-L Switch
    • Cisco Catalyst 2960-Plus 48TC-S Switch
    • Cisco Catalyst 2960C-12PC-L Switch
    • Cisco Catalyst 2960C-8PC-L Switch
    • Cisco Catalyst 2960C-8TC-L Switch
    • Cisco Catalyst 2960C-8TC-S Switch
    • Cisco Catalyst 2960CG-8TC-L Compact Switch
    • Cisco Catalyst 2960CPD-8PT-L Switch
    • Cisco Catalyst 2960CPD-8TT-L Switch
    • Cisco Catalyst 2960CX-8PC-L Switch
    • Cisco Catalyst 2960CX-8TC-L Switch
    • Cisco Catalyst 2960G-24TC-L Switch
    • Cisco Catalyst 2960G-48TC-L Switch
    • Cisco Catalyst 2960G-8TC-L Compact Switch
    • Cisco Catalyst 2960L-16PS-LL Switch
    • Cisco Catalyst 2960L-16TS-LL Switch
    • Cisco Catalyst 2960L-24PS-LL Switch
    • Cisco Catalyst 2960L-24TS-LL Switch
    • Cisco Catalyst 2960L-48PS-LL Switch
    • Cisco Catalyst 2960L-48TS-LL Switch
    • Cisco Catalyst 2960L-8PS-LL Switch
    • Cisco Catalyst 2960L-8TS-LL Switch
    • Cisco Catalyst 2960PD-8TT-L Compact Switch
    • Cisco Catalyst 2960S-24PD-L Switch
    • Cisco Catalyst 2960S-24PS-L Switch
    • Cisco Catalyst 2960S-24TD-L Switch
    • Cisco Catalyst 2960S-24TS-L Switch
    • Cisco Catalyst 2960S-24TS-S Switch
    • Cisco Catalyst 2960S-48FPD-L Switch
    • Cisco Catalyst 2960S-48FPS-L Switch
    • Cisco Catalyst 2960S-48LPD-L Switch
    • Cisco Catalyst 2960S-48LPS-L Switch
    • Cisco Catalyst 2960S-48TD-L Switch
    • Cisco Catalyst 2960S-48TS-L Switch
    • Cisco Catalyst 2960S-48TS-S Switch
    • Cisco Catalyst 2960S-F24PS-L Switch
    • Cisco Catalyst 2960S-F24TS-L Switch
    • Cisco Catalyst 2960S-F24TS-S Switch
    • Cisco Catalyst 2960S-F48FPS-L Switch
    • Cisco Catalyst 2960S-F48LPS-L Switch
    • Cisco Catalyst 2960S-F48TS-L Switch
    • Cisco Catalyst 2960S-F48TS-S Switch
    • Cisco Catalyst 2960X-24PD-L Switch
    • Cisco Catalyst 2960X-24PS-L Switch
    • Cisco Catalyst 2960X-24PSQ-L Cool Switch
    • Cisco Catalyst 2960X-24TD-L Switch
    • Cisco Catalyst 2960X-24TS-L Switch
    • Cisco Catalyst 2960X-24TS-LL Switch
    • Cisco Catalyst 2960X-48FPD-L Switch
    • Cisco Catalyst 2960X-48FPS-L Switch
    • Cisco Catalyst 2960X-48LPD-L Switch
    • Cisco Catalyst 2960X-48LPS-L Switch
    • Cisco Catalyst 2960X-48TD-L Switch
    • Cisco Catalyst 2960X-48TS-L Switch
    • Cisco Catalyst 2960X-48TS-LL Switch
    • Cisco Catalyst 2960XR-24PD-I Switch
    • Cisco Catalyst 2960XR-24PD-L Switch
    • Cisco Catalyst 2960XR-24PS-I Switch
    • Cisco Catalyst 2960XR-24PS-L Switch
    • Cisco Catalyst 2960XR-24TD-I Switch
    • Cisco Catalyst 2960XR-24TD-L Switch
    • Cisco Catalyst 2960XR-24TS-I Switch
    • Cisco Catalyst 2960XR-24TS-L Switch
    • Cisco Catalyst 2960XR-48FPD-I Switch
    • Cisco Catalyst 2960XR-48FPD-L Switch
    • Cisco Catalyst 2960XR-48FPS-I Switch
    • Cisco Catalyst 2960XR-48FPS-L Switch
    • Cisco Catalyst 2960XR-48LPD-I Switch
    • Cisco Catalyst 2960XR-48LPD-L Switch
    • Cisco Catalyst 2960XR-48LPS-I Switch
    • Cisco Catalyst 2960XR-48LPS-L Switch
    • Cisco Catalyst 2960XR-48TD-I Switch
    • Cisco Catalyst 2960XR-48TD-L Switch
    • Cisco Catalyst 2960XR-48TS-I Switch
    • Cisco Catalyst 2960XR-48TS-L Switch
    • Cisco Catalyst 2970G-24T Switch
    • Cisco Catalyst 2970G-24TS Switch
    • Cisco Catalyst 2975 Switch
    • Cisco Catalyst 3550 12G Switch
    • Cisco Catalyst 3550 12T Switch
    • Cisco Catalyst 3550 24 DC SMI Switch
    • Cisco Catalyst 3550 24 EMI Switch
    • Cisco Catalyst 3550 24 FX SMI Switch
    • Cisco Catalyst 3550 24 PWR Switch
    • Cisco Catalyst 3550 24 SMI Switch
    • Cisco Catalyst 3550 48 EMI Switch
    • Cisco Catalyst 3550 48 SMI Switch
    • Cisco Catalyst 3560-12PC-S Compact Switch
    • Cisco Catalyst 3560-24PS Switch
    • Cisco Catalyst 3560-24TS Switch
    • Cisco Catalyst 3560-48PS Switch
    • Cisco Catalyst 3560-48TS Switch
    • Cisco Catalyst 3560-8PC Compact Switch
    • Cisco Catalyst 3560C-12PC-S Switch
    • Cisco Catalyst 3560C-8PC-S Switch
    • Cisco Catalyst 3560CG-8PC-S Compact Switch
    • Cisco Catalyst 3560CG-8TC-S Compact Switch
    • Cisco Catalyst 3560CPD-8PT-S Compact Switch
    • Cisco Catalyst 3560CX-12PC-S Switch
    • Cisco Catalyst 3560CX-12PD-S Switch
    • Cisco Catalyst 3560CX-12TC-S Switch
    • Cisco Catalyst 3560CX-8PC-S Switch
    • Cisco Catalyst 3560CX-8PT-S Switch
    • Cisco Catalyst 3560CX-8TC-S Switch
    • Cisco Catalyst 3560CX-8XPD-S Switch
    • Cisco Catalyst 3560E-12D-E Switch
    • Cisco Catalyst 3560E-12D-S Switch
    • Cisco Catalyst 3560E-12SD-E Switch
    • Cisco Catalyst 3560E-12SD-S Switch
    • Cisco Catalyst 3560E-24PD-E Switch
    • Cisco Catalyst 3560E-24PD-S Switch
    • Cisco Catalyst 3560E-24TD-E Switch
    • Cisco Catalyst 3560E-24TD-S Switch
    • Cisco Catalyst 3560E-48PD-E Switch
    • Cisco Catalyst 3560E-48PD-EF Switch
    • Cisco Catalyst 3560E-48PD-S Switch
    • Cisco Catalyst 3560E-48PD-SF Switch
    • Cisco Catalyst 3560E-48TD-E Switch
    • Cisco Catalyst 3560E-48TD-S Switch
    • Cisco Catalyst 3560G-24PS Switch
    • Cisco Catalyst 3560G-24TS Switch
    • Cisco Catalyst 3560G-48PS Switch
    • Cisco Catalyst 3560G-48TS Switch
    • Cisco Catalyst 3560V2-24DC Switch
    • Cisco Catalyst 3560V2-24PS Switch
    • Cisco Catalyst 3560V2-24TS Switch
    • Cisco Catalyst 3560V2-48PS Switch
    • Cisco Catalyst 3560V2-48TS Switch
    • Cisco Catalyst 3560X-24P-E Switch
    • Cisco Catalyst 3560X-24P-L Switch
    • Cisco Catalyst 3560X-24P-S Switch
    • Cisco Catalyst 3560X-24T-E Switch
    • Cisco Catalyst 3560X-24T-L Switch
    • Cisco Catalyst 3560X-24T-S Switch
    • Cisco Catalyst 3560X-24U-E Switch
    • Cisco Catalyst 3560X-24U-L Switch
    • Cisco Catalyst 3560X-24U-S Switch
    • Cisco Catalyst 3560X-48P-E Switch
    • Cisco Catalyst 3560X-48P-L Switch
    • Cisco Catalyst 3560X-48P-S Switch
    • Cisco Catalyst 3560X-48PF-E Switch
    • Cisco Catalyst 3560X-48PF-L Switch
    • Cisco Catalyst 3560X-48PF-S Switch
    • Cisco Catalyst 3560X-48T-E Switch
    • Cisco Catalyst 3560X-48T-L Switch
    • Cisco Catalyst 3560X-48T-S Switch
    • Cisco Catalyst 3560X-48U-E Switch
    • Cisco Catalyst 3560X-48U-L Switch
    • Cisco Catalyst 3560X-48U-S Switch
    • Cisco Catalyst 3750 Metro 24-AC Switch
    • Cisco Catalyst 3750 Metro 24-DC Switch
    • Cisco Catalyst 3750-24FS Switch
    • Cisco Catalyst 3750-24PS Switch
    • Cisco Catalyst 3750-24TS Switch
    • Cisco Catalyst 3750-48PS Switch
    • Cisco Catalyst 3750-48TS Switch
    • Cisco Catalyst 3750E-24PD-E Switch
    • Cisco Catalyst 3750E-24PD-S Switch
    • Cisco Catalyst 3750E-24TD-E Switch
    • Cisco Catalyst 3750E-24TD-S Switch
    • Cisco Catalyst 3750E-48PD-E Switch
    • Cisco Catalyst 3750E-48PD-EF Switch
    • Cisco Catalyst 3750E-48PD-S Switch
    • Cisco Catalyst 3750E-48PD-SF Switch
    • Cisco Catalyst 3750E-48TD-E Switch
    • Cisco Catalyst 3750E-48TD-S Switch
    • Cisco Catalyst 3750G-12S Switch
    • Cisco Catalyst 3750G-12S-SD Switch
    • Cisco Catalyst 3750G-16TD Switch
    • Cisco Catalyst 3750G-24PS Switch
    • Cisco Catalyst 3750G-24T Switch
    • Cisco Catalyst 3750G-24TS Switch
    • Cisco Catalyst 3750G-24TS-1U Switch
    • Cisco Catalyst 3750G-48PS Switch
    • Cisco Catalyst 3750G-48TS Switch
    • Cisco Catalyst 3750V2-24FS Switch
    • Cisco Catalyst 3750V2-24PS Switch
    • Cisco Catalyst 3750V2-24TS Switch
    • Cisco Catalyst 3750V2-48PS Switch
    • Cisco Catalyst 3750V2-48TS Switch
    • Cisco Catalyst 3750X-12S-E Switch
    • Cisco Catalyst 3750X-12S-S Switch
    • Cisco Catalyst 3750X-24P-E Switch
    • Cisco Catalyst 3750X-24P-L Switch
    • Cisco Catalyst 3750X-24P-S Switch
    • Cisco Catalyst 3750X-24S-E Switch
    • Cisco Catalyst 3750X-24S-S Switch
    • Cisco Catalyst 3750X-24T-E Switch
    • Cisco Catalyst 3750X-24T-L Switch
    • Cisco Catalyst 3750X-24T-S Switch
    • Cisco Catalyst 3750X-24U-E Switch
    • Cisco Catalyst 3750X-24U-L Switch
    • Cisco Catalyst 3750X-24U-S Switch
    • Cisco Catalyst 3750X-48P-E Switch
    • Cisco Catalyst 3750X-48P-L Switch
    • Cisco Catalyst 3750X-48P-S Switch
    • Cisco Catalyst 3750X-48PF-E Switch
    • Cisco Catalyst 3750X-48PF-L Switch
    • Cisco Catalyst 3750X-48PF-S Switch
    • Cisco Catalyst 3750X-48T-E Switch
    • Cisco Catalyst 3750X-48T-L Switch
    • Cisco Catalyst 3750X-48T-S Switch
    • Cisco Catalyst 3750X-48U-E Switch
    • Cisco Catalyst 3750X-48U-L Switch
    • Cisco Catalyst 3750X-48U-S Switch
    • Cisco Catalyst 4000 Supervisor Engine I
    • Cisco Catalyst 4000/4500 Supervisor Engine IV
    • Cisco Catalyst 4000/4500 Supervisor Engine V
    • Cisco Catalyst 4500 Series Supervisor Engine II-Plus
    • Cisco Catalyst 4500 Series Supervisor Engine II-Plus-TS
    • Cisco Catalyst 4500 Series Supervisor Engine V-10GE
    • Cisco Catalyst 4500 Series Supervisor II-Plus-10GE
    • Cisco Catalyst 4500 Supervisor Engine 6-E
    • Cisco Catalyst 4500 Supervisor Engine 6L-E
    • Cisco Catalyst 4900M Switch
    • Cisco Catalyst 4928 10 Gigabit Ethernet Switch
    • Cisco Catalyst 4948 10 Gigabit Ethernet Switch
    • Cisco Catalyst 4948 Switch
    • Cisco Catalyst 4948E Ethernet Switch
    • Cisco Catalyst 4948E-F Ethernet Switch
    • Cisco Catalyst Blade Switch 3020 for HP
    • Cisco Catalyst Blade Switch 3030 for Dell
    • Cisco Catalyst Blade Switch 3032 for Dell M1000E
    • Cisco Catalyst Blade Switch 3040 for FSC
    • Cisco Catalyst Blade Switch 3120 for HP
    • Cisco Catalyst Blade Switch 3120X for HP
    • Cisco Catalyst Blade Switch 3130 for Dell M1000E
    • Cisco Catalyst C2928-24LT-C Switch
    • Cisco Catalyst C2928-48TC-C Switch
    • Cisco Catalyst Switch Module 3012 for IBM BladeCenter
    • Cisco Catalyst Switch Module 3110 for IBM BladeCenter
    • Cisco Catalyst Switch Module 3110X for IBM BladeCenter
    • Cisco Embedded Service 2020 24TC CON B Switch
    • Cisco Embedded Service 2020 24TC CON Switch
    • Cisco Embedded Service 2020 24TC NCP B Switch
    • Cisco Embedded Service 2020 24TC NCP Switch
    • Cisco Embedded Service 2020 CON B Switch
    • Cisco Embedded Service 2020 CON Switch
    • Cisco Embedded Service 2020 NCP B Switch
    • Cisco Embedded Service 2020 NCP Switch
    • Cisco Enhanced Layer 2 EtherSwitch Service Module
    • Cisco Enhanced Layer 2/3 EtherSwitch Service Module
    • Cisco Gigabit Ethernet Switch Module (CGESM) for HP
    • Cisco IE 2000-16PTC-G Industrial Ethernet Switch
    • Cisco IE 2000-16T67 Industrial Ethernet Switch
    • Cisco IE 2000-16T67P Industrial Ethernet Switch
    • Cisco IE 2000-16TC Industrial Ethernet Switch
    • Cisco IE 2000-16TC-G Industrial Ethernet Switch
    • Cisco IE 2000-16TC-G-E Industrial Ethernet Switch
    • Cisco IE 2000-16TC-G-N Industrial Ethernet Switch
    • Cisco IE 2000-16TC-G-X Industrial Ethernet Switch
    • Cisco IE 2000-24T67 Industrial Ethernet Switch
    • Cisco IE 2000-4S-TS-G Industrial Ethernet Switch
    • Cisco IE 2000-4T Industrial Ethernet Switch
    • Cisco IE 2000-4T-G Industrial Ethernet Switch
    • Cisco IE 2000-4TS Industrial Ethernet Switch
    • Cisco IE 2000-4TS-G Industrial Ethernet Switch
    • Cisco IE 2000-8T67 Industrial Ethernet Switch
    • Cisco IE 2000-8T67P Industrial Ethernet Switch
    • Cisco IE 2000-8TC Industrial Ethernet Switch
    • Cisco IE 2000-8TC-G Industrial Ethernet Switch
    • Cisco IE 2000-8TC-G-E Industrial Ethernet Switch
    • Cisco IE 2000-8TC-G-N Industrial Ethernet Switch
    • Cisco IE 3000-4TC Industrial Ethernet Switch
    • Cisco IE 3000-8TC Industrial Ethernet Switch
    • Cisco IE-3010-16S-8PC Industrial Ethernet Switch
    • Cisco IE-3010-24TC Industrial Ethernet Switch
    • Cisco IE-4000-16GT4G-E Industrial Ethernet Switch
    • Cisco IE-4000-16T4G-E Industrial Ethernet Switch
    • Cisco IE-4000-4GC4GP4G-E Industrial Ethernet Switch
    • Cisco IE-4000-4GS8GP4G-E Industrial Ethernet Switch
    • Cisco IE-4000-4S8P4G-E Industrial Ethernet Switch
    • Cisco IE-4000-4T4P4G-E Industrial Ethernet Switch
    • Cisco IE-4000-4TC4G-E Industrial Ethernet Switch
    • Cisco IE-4000-8GS4G-E Industrial Ethernet Switch
    • Cisco IE-4000-8GT4G-E Industrial Ethernet Switch
    • Cisco IE-4000-8GT8GP4G-E Industrial Ethernet Switch
    • Cisco IE-4000-8S4G-E Industrial Ethernet Switch
    • Cisco IE-4000-8T4G-E Industrial Ethernet Switch
    • Cisco IE-4010-16S12P Industrial Ethernet Switch
    • Cisco IE-4010-4S24P Industrial Ethernet Switch
    • Cisco IE-5000-12S12P-10G Industrial Ethernet Switch
    • Cisco IE-5000-16S12P Industrial Ethernet Switch
    • Cisco ME 4924-10GE Switch
    • Cisco RF Gateway 10
    • Cisco SM-X Layer 2/3 EtherSwitch Service Module

    Attempts to exploit this vulnerability can be seen in logs by Cisco IPS Signature 7880-0 , Snort SID 41909 and 41910 signatures, Cisco reports.

    To bypass the vulnerability in any way is impossible only if you completely disable incoming telnet connections and leave SSH. Cisco currently recommends this configuration. If disabling telnet is unacceptable for you, you can reduce the likelihood of an attack by restricting access using Infrastructure Protection Access Control Lists .

    Cisco has promised to release a patch in the future.

    Cisco was the first major hardware vendor to uncover a vulnerability mentioned in the CIA documents. So far, only software developers reported closing bugs.. Of course, the documents still need to be carefully analyzed. The Wikileaks site has not yet released the CIA's exploit files in open access, but promised to provide them first of all to vendors for the priority closure of vulnerabilities before putting these tools in the hands of everyone. Julian Assange also mentioned that the published portion of Year Zero is only 1% of the total Vault 7. Documents are at the disposal of Wikileaks and will be laid out in parts.

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