1) Improper input validation

EUVDB-ID: #VU6125

Risk: Critical

CVSSv3.1: 9.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2017-3881

CWE-ID: CWE-20 - Improper Input Validation

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to gain access to vulnerable device.

The vulnerability exists due to improper input validation in Cisco Cluster Management Protocol (CMP) implementation and failure to restrict usage of CMP-specific Telnet options only to internal, local communications between cluster members. A remote unauthenticated attacker can send specially crafted CMP-specific Telnet options while establishing a Telnet session with an affected Cisco device configured to accept Telnet connections and cause the affected device to reload or obtain full control over vulnerable device.

Successful exploitation of this vulnerability may allow an attacker to gain full access to vulnerable device.

Note: information about this vulnerability was publicly disclosed by WikiLeaks documents dubbed CIA Vault 7.

Mitigation

Install update from Cisco website.

Vulnerable software versions

Cisco IOS: All versions

Cisco IOS XE: All versions

Cisco SM-X Layer 2/3 EtherSwitch Service Module: All versions

Cisco RF Gateway 10: All versions

Cisco ME 4924-10GE Switch: All versions

Cisco IE-5000-16S12P Industrial Ethernet Switch: All versions

Cisco IE-5000-12S12P-10G Industrial Ethernet Switch: All versions

Cisco IE-4010-4S24P Industrial Ethernet Switch: All versions

Cisco IE-4010-16S12P Industrial Ethernet Switch: All versions

Cisco IE-4000-8T4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-8S4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-8GT8GP4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-8GT4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-8GS4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-4TC4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-4T4P4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-4S8P4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-4GS8GP4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-4GC4GP4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-16T4G-E Industrial Ethernet Switch: All versions

Cisco IE-4000-16GT4G-E Industrial Ethernet Switch: All versions

Cisco IE-3010-24TC Industrial Ethernet Switch: All versions

Cisco IE-3010-16S-8PC Industrial Ethernet Switch: All versions

Cisco IE 3000-8TC Industrial Ethernet Switch: All versions

Cisco IE 3000-4TC Industrial Ethernet Switch: All versions

Cisco IE 2000-8TC-G-N Industrial Ethernet Switch: All versions

Cisco IE 2000-8TC-G-E Industrial Ethernet Switch: All versions

Cisco IE 2000-8TC-G Industrial Ethernet Switch: All versions

Cisco IE 2000-8TC Industrial Ethernet Switch: All versions

Cisco IE 2000-8T67P Industrial Ethernet Switch: All versions

Cisco IE 2000-8T67 Industrial Ethernet Switch: All versions

Cisco IE 2000-4TS-G Industrial Ethernet Switch: All versions

Cisco IE 2000-4TS Industrial Ethernet Switch: All versions

Cisco IE 2000-4T-G Industrial Ethernet Switch: All versions

Cisco IE 2000-4T Industrial Ethernet Switch: All versions

Cisco IE 2000-4S-TS-G Industrial Ethernet Switch: All versions

Cisco IE 2000-24T67 Industrial Ethernet Switch: All versions

Cisco IE 2000-16TC-G-X Industrial Ethernet Switch: All versions

Cisco IE 2000-16TC-G-N Industrial Ethernet Switch: All versions

Cisco IE 2000-16TC-G-E Industrial Ethernet Switch: All versions

Cisco IE 2000-16TC-G Industrial Ethernet Switch: All versions

Cisco IE 2000-16TC Industrial Ethernet Switch: All versions

Cisco IE 2000-16T67P Industrial Ethernet Switch: All versions

Cisco IE 2000-16T67 Industrial Ethernet Switch: All versions

Cisco IE 2000-16PTC-G Industrial Ethernet Switch: All versions

Cisco Gigabit Ethernet Switch Module (CGESM) for HP: All versions

Cisco Enhanced Layer 2/3 EtherSwitch Service Module: All versions

Cisco Enhanced Layer 2 EtherSwitch Service Module: All versions

Cisco Embedded Service 2020 NCP Switch: All versions

Cisco Embedded Service 2020 NCP B Switch: All versions

Cisco Embedded Service 2020 CON Switch: All versions

Cisco Embedded Service 2020 CON B Switch: All versions

Cisco Embedded Service 2020 24TC NCP Switch: All versions

Cisco Embedded Service 2020 24TC NCP B Switch: All versions

Cisco Embedded Service 2020 24TC CON Switch: All versions

Cisco Embedded Service 2020 24TC CON B Switch: All versions

Cisco Catalyst Switch Module 3110X for IBM BladeCenter: All versions

Cisco Catalyst Switch Module 3110 for IBM BladeCenter: All versions

Cisco Catalyst Switch Module 3012 for IBM BladeCenter: All versions

Cisco Catalyst C2928-48TC-C Switch: All versions

Cisco Catalyst C2928-24LT-C Switch: All versions

Cisco Catalyst Blade Switch 3130 for Dell M1000E: All versions

Cisco Catalyst Blade Switch 3120X for HP: All versions

Cisco Catalyst Blade Switch 3120 for HP: All versions

Cisco Catalyst Blade Switch 3040 for FSC: All versions

Cisco Catalyst Blade Switch 3032 for Dell M1000E: All versions

Cisco Catalyst Blade Switch 3030 for Dell: All versions

Cisco Catalyst Blade Switch 3020 for HP: All versions

Cisco Catalyst 4948E-F Ethernet Switch: All versions

Cisco Catalyst 4948E Ethernet Switch: All versions

Cisco Catalyst 4948 Switch: All versions

Cisco Catalyst 4948 10 Gigabit Ethernet Switch: All versions

Cisco Catalyst 4928 10 Gigabit Ethernet Switch: All versions

Cisco Catalyst 4900M Switch: All versions

Cisco Catalyst 4500 Supervisor Engine 6L-E: All versions

Cisco Catalyst 4500 Supervisor Engine 6-E: All versions

Cisco Catalyst 4500 Series Supervisor II-Plus-10GE: All versions

Cisco Catalyst 4500 Series Supervisor Engine V-10GE: All versions

Cisco Catalyst 4500 Series Supervisor Engine II-Plus-TS: All versions

Cisco Catalyst 4500 Series Supervisor Engine II-Plus: All versions

Cisco Catalyst 4000/4500 Supervisor Engine V: All versions

Cisco Catalyst 4000/4500 Supervisor Engine IV: All versions

Cisco Catalyst 4000 Supervisor Engine I: All versions

Cisco Catalyst 3750X-48U-S Switch: All versions

Cisco Catalyst 3750X-48U-L Switch: All versions

Cisco Catalyst 3750X-48U-E Switch: All versions

Cisco Catalyst 3750X-48T-S Switch: All versions

Cisco Catalyst 3750X-48T-L Switch: All versions

Cisco Catalyst 3750X-48T-E Switch: All versions

Cisco Catalyst 3750X-48PF-S Switch: All versions

Cisco Catalyst 3750X-48PF-L Switch: All versions

Cisco Catalyst 3750X-48PF-E Switch: All versions

Cisco Catalyst 3750X-48P-S Switch: All versions

Cisco Catalyst 3750X-48P-L Switch: All versions

Cisco Catalyst 3750X-48P-E Switch: All versions

Cisco Catalyst 3750X-24U-S Switch: All versions

Cisco Catalyst 3750X-24U-L Switch: All versions

Cisco Catalyst 3750X-24U-E Switch: All versions

Cisco Catalyst 3750X-24T-S Switch: All versions

Cisco Catalyst 3750X-24T-L Switch: All versions

Cisco Catalyst 3750X-24T-E Switch: All versions

Cisco Catalyst 3750X-24S-S Switch: All versions

Cisco Catalyst 3750X-24S-E Switch: All versions

Cisco Catalyst 3750X-24P-S Switch: All versions

Cisco Catalyst 3750X-24P-L Switch: All versions

Cisco Catalyst 3750X-24P-E Switch: All versions

Cisco Catalyst 3750X-12S-S Switch: All versions

Cisco Catalyst 3750X-12S-E Switch: All versions

Cisco Catalyst 3750V2-48TS Switch: All versions

Cisco Catalyst 3750V2-48PS Switch: All versions

Cisco Catalyst 3750V2-24TS Switch: All versions

Cisco Catalyst 3750V2-24PS Switch: All versions

Cisco Catalyst 3750V2-24FS Switch: All versions

Cisco Catalyst 3750G-48TS Switch: All versions

Cisco Catalyst 3750G-48PS Switch: All versions

Cisco Catalyst 3750G-24TS-1U Switch: All versions

Cisco Catalyst 3750G-24TS Switch: All versions

Cisco Catalyst 3750G-24T Switch: All versions

Cisco Catalyst 3750G-24PS Switch: All versions

Cisco Catalyst 3750G-16TD Switch: All versions

Cisco Catalyst 3750G-12S-SD Switch: All versions

Cisco Catalyst 3750G-12S Switch: All versions

Cisco Catalyst 3750E-48TD-S Switch: All versions

Cisco Catalyst 3750E-48TD-E Switch: All versions

Cisco Catalyst 3750E-48PD-SF Switch: All versions

Cisco Catalyst 3750E-48PD-S Switch: All versions

Cisco Catalyst 3750E-48PD-EF Switch: All versions

Cisco Catalyst 3750E-48PD-E Switch: All versions

Cisco Catalyst 3750E-24TD-S Switch: All versions

Cisco Catalyst 3750E-24TD-E Switch: All versions

Cisco Catalyst 3750E-24PD-S Switch: All versions

Cisco Catalyst 3750E-24PD-E Switch: All versions

Cisco Catalyst 3750-48TS Switch: All versions

Cisco Catalyst 3750-48PS Switch: All versions

Cisco Catalyst 3750-24TS Switch: All versions

Cisco Catalyst 3750-24PS Switch: All versions

Cisco Catalyst 3750-24FS Switch: All versions

Cisco Catalyst 3750 Metro 24-DC Switch: All versions

Cisco Catalyst 3750 Metro 24-AC Switch: All versions

Cisco Catalyst 3560X-48U-S Switch: All versions

Cisco Catalyst 3560X-48U-L Switch: All versions

Cisco Catalyst 3560X-48U-E Switch: All versions

Cisco Catalyst 3560X-48T-S Switch: All versions

Cisco Catalyst 3560X-48T-L Switch: All versions

Cisco Catalyst 3560X-48T-E Switch: All versions

Cisco Catalyst 3560X-48PF-S Switch: All versions

Cisco Catalyst 3560X-48PF-L Switch: All versions

Cisco Catalyst 3560X-48PF-E Switch: All versions

Cisco Catalyst 3560X-48P-S Switch: All versions

Cisco Catalyst 3560X-48P-L Switch: All versions

Cisco Catalyst 3560X-48P-E Switch: All versions

Cisco Catalyst 3560X-24U-S Switch: All versions

Cisco Catalyst 3560X-24U-L Switch: All versions

Cisco Catalyst 3560X-24U-E Switch: All versions

Cisco Catalyst 3560X-24T-S Switch: All versions

Cisco Catalyst 3560X-24T-L Switch: All versions

Cisco Catalyst 3560X-24T-E Switch: All versions

Cisco Catalyst 3560X-24P-S Switch: All versions

Cisco Catalyst 3560X-24P-L Switch: All versions

Cisco Catalyst 3560X-24P-E Switch: All versions

Cisco Catalyst 3560V2-48TS Switch: All versions

Cisco Catalyst 3560V2-48PS Switch: All versions

Cisco Catalyst 3560V2-24TS Switch: All versions

Cisco Catalyst 3560V2-24PS Switch: All versions

Cisco Catalyst 3560V2-24DC Switch: All versions

Cisco Catalyst 3560G-48TS Switch: All versions

Cisco Catalyst 3560G-48PS Switch: All versions

Cisco Catalyst 3560G-24TS Switch: All versions

Cisco Catalyst 3560G-24PS Switch: All versions

Cisco Catalyst 3560E-48TD-S Switch: All versions

Cisco Catalyst 3560E-48TD-E Switch: All versions

Cisco Catalyst 3560E-48PD-SF Switch: All versions

Cisco Catalyst 3560E-48PD-S Switch: All versions

Cisco Catalyst 3560E-48PD-EF Switch: All versions

Cisco Catalyst 3560E-48PD-E Switch: All versions

Cisco Catalyst 3560E-24TD-S Switch: All versions

Cisco Catalyst 3560E-24TD-E Switch: All versions

Cisco Catalyst 3560E-24PD-S Switch: All versions

Cisco Catalyst 3560E-24PD-E Switch: All versions

Cisco Catalyst 3560E-12SD-S Switch: All versions

Cisco Catalyst 3560E-12SD-E Switch: All versions

Cisco Catalyst 3560E-12D-S Switch: All versions

Cisco Catalyst 3560E-12D-E Switch: All versions

Cisco Catalyst 3560CX-8XPD-S Switch: All versions

Cisco Catalyst 3560CX-8TC-S Switch: All versions

Cisco Catalyst 3560CX-8PT-S Switch: All versions

Cisco Catalyst 3560CX-8PC-S Switch: All versions

Cisco Catalyst 3560CX-12TC-S Switch: All versions

Cisco Catalyst 3560CX-12PD-S Switch: All versions

Cisco Catalyst 3560CX-12PC-S Switch: All versions

Cisco Catalyst 3560CPD-8PT-S Compact Switch: All versions

Cisco Catalyst 3560CG-8TC-S Compact Switch: All versions

Cisco Catalyst 3560CG-8PC-S Compact Switch: All versions

Cisco Catalyst 3560C-8PC-S Switch: All versions

Cisco Catalyst 3560C-12PC-S Switch: All versions

Cisco Catalyst 3560-8PC Compact Switch: All versions

Cisco Catalyst 3560-48TS Switch: All versions

Cisco Catalyst 3560-48PS Switch: All versions

Cisco Catalyst 3560-24TS Switch: All versions

Cisco Catalyst 3560-24PS Switch: All versions

Cisco Catalyst 3560-12PC-S Compact Switch: All versions

Cisco Catalyst 3550 48 SMI Switch: All versions

Cisco Catalyst 3550 48 EMI Switch: All versions

Cisco Catalyst 3550 24 SMI Switch: All versions

Cisco Catalyst 3550 24 PWR Switch: All versions

Cisco Catalyst 3550 24 FX SMI Switch: All versions

Cisco Catalyst 3550 24 EMI Switch: All versions

Cisco Catalyst 3550 24 DC SMI Switch: All versions

Cisco Catalyst 3550 12T Switch: All versions

Cisco Catalyst 3550 12G Switch: All versions

Cisco Catalyst 2975 Switch: All versions

Cisco Catalyst 2970G-24TS Switch: All versions

Cisco Catalyst 2970G-24T Switch: All versions

Cisco Catalyst 2960XR-48TS-L Switch: All versions

Cisco Catalyst 2960XR-48TS-I Switch: All versions

Cisco Catalyst 2960XR-48TD-L Switch: All versions

Cisco Catalyst 2960XR-48TD-I Switch: All versions

Cisco Catalyst 2960XR-48LPS-L Switch: All versions

Cisco Catalyst 2960XR-48LPS-I Switch: All versions

Cisco Catalyst 2960XR-48LPD-L Switch: All versions

Cisco Catalyst 2960XR-48LPD-I Switch: All versions

Cisco Catalyst 2960XR-48FPS-L Switch: All versions

Cisco Catalyst 2960XR-48FPS-I Switch: All versions

Cisco Catalyst 2960XR-48FPD-L Switch: All versions

Cisco Catalyst 2960XR-48FPD-I Switch: All versions

Cisco Catalyst 2960XR-24TS-L Switch: All versions

Cisco Catalyst 2960XR-24TS-I Switch: All versions

Cisco Catalyst 2960XR-24TD-L Switch: All versions

Cisco Catalyst 2960XR-24TD-I Switch: All versions

Cisco Catalyst 2960XR-24PS-L Switch: All versions

Cisco Catalyst 2960XR-24PS-I Switch: All versions

Cisco Catalyst 2960XR-24PD-L Switch: All versions

Cisco Catalyst 2960XR-24PD-I Switch: All versions

Cisco Catalyst 2960X-48TS-LL Switch: All versions

Cisco Catalyst 2960X-48TS-L Switch: All versions

Cisco Catalyst 2960X-48TD-L Switch: All versions

Cisco Catalyst 2960X-48LPS-L Switch: All versions

Cisco Catalyst 2960X-48LPD-L Switch: All versions

Cisco Catalyst 2960X-48FPS-L Switch: All versions

Cisco Catalyst 2960X-48FPD-L Switch: All versions

Cisco Catalyst 2960X-24TS-LL Switch: All versions

Cisco Catalyst 2960X-24TS-L Switch: All versions

Cisco Catalyst 2960X-24TD-L Switch: All versions

Cisco Catalyst 2960X-24PSQ-L Cool Switch: All versions

Cisco Catalyst 2960X-24PS-L Switch: All versions

Cisco Catalyst 2960X-24PD-L Switch: All versions

Cisco Catalyst 2960S-F48TS-S Switch: All versions

Cisco Catalyst 2960S-F48TS-L Switch: All versions

Cisco Catalyst 2960S-F48LPS-L Switch: All versions

Cisco Catalyst 2960S-F48FPS-L Switch: All versions

Cisco Catalyst 2960S-F24TS-S Switch: All versions

Cisco Catalyst 2960S-F24TS-L Switch: All versions

Cisco Catalyst 2960S-F24PS-L Switch: All versions

Cisco Catalyst 2960S-48TS-S Switch: All versions

Cisco Catalyst 2960S-48TS-L Switch: All versions

Cisco Catalyst 2960S-48TD-L Switch: All versions

Cisco Catalyst 2960S-48LPS-L Switch: All versions

Cisco Catalyst 2960S-48LPD-L Switch: All versions

Cisco Catalyst 2960S-48FPS-L Switch: All versions

Cisco Catalyst 2960S-48FPD-L Switch: All versions

Cisco Catalyst 2960S-24TS-S Switch: All versions

Cisco Catalyst 2960S-24TS-L Switch: All versions

Cisco Catalyst 2960S-24TD-L Switch: All versions

Cisco Catalyst 2960S-24PS-L Switch: All versions

Cisco Catalyst 2960S-24PD-L Switch: All versions

Cisco Catalyst 2960PD-8TT-L Compact Switch: All versions

Cisco Catalyst 2960L-8TS-LL Switch: All versions

Cisco Catalyst 2960L-8PS-LL Switch: All versions

Cisco Catalyst 2960L-48TS-LL Switch: All versions

Cisco Catalyst 2960L-48PS-LL Switch: All versions

Cisco Catalyst 2960L-24TS-LL Switch: All versions

Cisco Catalyst 2960L-24PS-LL Switch: All versions

Cisco Catalyst 2960L-16TS-LL Switch: All versions

Cisco Catalyst 2960L-16PS-LL Switch: All versions

Cisco Catalyst 2960G-8TC-L Compact Switch: All versions

Cisco Catalyst 2960G-48TC-L Switch: All versions

Cisco Catalyst 2960G-24TC-L Switch: All versions

Cisco Catalyst 2960CX-8TC-L Switch: All versions

Cisco Catalyst 2960CX-8PC-L Switch: All versions

Cisco Catalyst 2960CPD-8TT-L Switch: All versions

Cisco Catalyst 2960CPD-8PT-L Switch: All versions

Cisco Catalyst 2960CG-8TC-L Compact Switch: All versions

Cisco Catalyst 2960C-8TC-S Switch: All versions

Cisco Catalyst 2960C-8TC-L Switch: All versions

Cisco Catalyst 2960C-8PC-L Switch: All versions

Cisco Catalyst 2960C-12PC-L Switch: All versions

Cisco Catalyst 2960-Plus 48TC-S Switch: All versions

Cisco Catalyst 2960-Plus 48TC-L Switch: All versions

Cisco Catalyst 2960-Plus 48PST-S Switch: All versions

Cisco Catalyst 2960-Plus 48PST-L Switch: All versions

Cisco Catalyst 2960-Plus 24TC-S Switch: All versions

Cisco Catalyst 2960-Plus 24TC-L Switch: All versions

Cisco Catalyst 2960-Plus 24PC-S Switch: All versions

Cisco Catalyst 2960-Plus 24PC-L Switch: All versions

Cisco Catalyst 2960-Plus 24LC-S Switch: All versions

Cisco Catalyst 2960-Plus 24LC-L Switch: All versions

Cisco Catalyst 2960-8TC-S Compact Switch: All versions

Cisco Catalyst 2960-8TC-L Compact Switch: All versions

Cisco Catalyst 2960-48TT-S Switch: All versions

Cisco Catalyst 2960-48TT-L Switch: All versions

Cisco Catalyst 2960-48TC-S Switch: All versions

Cisco Catalyst 2960-48TC-L Switch: All versions

Cisco Catalyst 2960-48PST-S Switch: All versions

Cisco Catalyst 2960-48PST-L Switch: All versions

Cisco Catalyst 2960-24TT-L Switch: All versions

Cisco Catalyst 2960-24TC-S Switch: All versions

Cisco Catalyst 2960-24TC-L Switch: All versions

Cisco Catalyst 2960-24PC-S Switch: All versions

Cisco Catalyst 2960-24PC-L Switch: All versions

Cisco Catalyst 2960-24LT-L Switch: All versions

Cisco Catalyst 2960-24LC-S Switch: All versions

Cisco Catalyst 2960-24-S Switch: All versions

Cisco Catalyst 2928-24TC-C Switch: All versions

Cisco Catalyst 2918-48TT-C Switch: All versions

Cisco Catalyst 2918-48TC-C Switch: All versions

Cisco Catalyst 2918-24TT-C Switch: All versions

Cisco Catalyst 2918-24TC-C Switch: All versions

Cisco Catalyst 2360-48TD-S Switch: All versions

Cisco Catalyst 2350-48TD-SD Switch: All versions

Cisco Catalyst 2350-48TD-S Switch: All versions

CPE2.3

• cpe:2.3:o:cisco_systems:cisco_ios:*:*:*:*:*:*:*:*
• Full software list in CPE2.3 format available after registration.

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170317-cmp

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.