CVE-2017-3881
Cisco IOS and IOS XE Remote Code Execution Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 15 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 98.98% probability · 100th percentile
- CISA KEV
- Listed 25 March 2022 · due 15 April 2022
- Weakness
- CWE-20
- Affected
- cisco/ios · cisco/ios xe
- Source
- psirt@cisco.com
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2017-3881
References
- http://www.securityfocus.com/bid/96960Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/97391Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038059Third Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170317-cmpVendor Advisory
- https://www.exploit-db.com/exploits/41872/Exploit, Third Party Advisory, VDB Entry
- https://www.exploit-db.com/exploits/41874/Broken Link
- http://www.securityfocus.com/bid/96960Third Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/97391Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038059Third Party Advisory, VDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170317-cmpVendor Advisory
- https://www.exploit-db.com/exploits/41872/Exploit, Third Party Advisory, VDB Entry
- https://www.exploit-db.com/exploits/41874/Broken Link
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-3881US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.