cbcvebase.
CVE-2018-0161
published 2018-03-28

CVE-2018-0161: A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could…

PriorityP273medium6.3CVSS 3.1
AVNACHPRLUINSCCNINAH
KEVITW
CISA Known Exploited Vulnerabilitydue 2022-03-17
Exploited in the wild
EPSS
4.73%
90.9th percentile
A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco Catalyst Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition, aka a GET MIB Object ID Denial of Service Vulnerability. The vulnerability is due to a condition that could occur when the affected software processes an SNMP read request that contains a request for the ciscoFlashMIB object ID (OID). An attacker could trigger this vulnerability by issuing an SNMP GET request for the ciscoFlashMIB OID on an affected device. A successful exploit could cause the affected device to restart due to a SYS-3-CPUHOG. This vulnerability affects the following Cisco devices if they are running a vulnerable release of Cisco IOS Software and are configured to use SNMP Version 2 (SNMPv2) or SNMP Version 3 (SNMPv3): Cisco Catalyst 2960-L Series Switches, Cisco Catalyst Digital Building Series Switches 8P, Cisco Catalyst Digital Building Series Switches 8U. Cisco Bug IDs: CSCvd89541.

Affected

2 ranges
VendorProductVersion rangeFixed in
ciscoios——
ciscoios——

Detection & IOCsextracted from sources · hover to see the quote

otherciscoFlashMIB OID (SNMP GET request)↗
portUDP/161 (SNMPv2 or SNMPv3)↗
  • →Monitor for SNMP GET requests targeting the ciscoFlashMIB OID on Cisco Catalyst 2960-L, Catalyst Digital Building Series 8P, and 8U switches; a successful exploit will cause the device to restart with a SYS-3-CPUHOG syslog message. ↗
  • →Alert on SYS-3-CPUHOG log events on affected Cisco IOS devices as a post-exploitation indicator of this DoS vulnerability being triggered. ↗
  • →Restrict SNMP access and audit SNMP community strings / user accounts; exploitation requires an authenticated attacker, so unauthorized SNMP credentials in use should be treated as a high-priority indicator. ↗
  • ·Vulnerability only affects devices running vulnerable Cisco IOS Software AND configured to use SNMPv2 or SNMPv3; devices not running SNMP or using SNMPv1 are not affected. ↗
  • ·Affected platforms are limited to Cisco Catalyst 2960-L Series Switches, Cisco Catalyst Digital Building Series Switches 8P, and Cisco Catalyst Digital Building Series Switches 8U; other Catalyst models are not listed as affected. ↗
  • ·Workarounds exist per Cisco's advisory; applying them can mitigate the vulnerability without a full software update. ↗
  • ·Cisco Bug ID CSCvd89541 tracks this issue and can be used to cross-reference fixed software releases in Cisco's bug search tool. ↗

CVSS provenance

nvdv3.16.3MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
nvdv2.06.3MEDIUMAV:N/AC:M/Au:S/C:N/I:N/A:C
vulncheck6.3MEDIUM
cisa6.3MEDIUM
vendor_cisco7.7HIGH
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