Detections
Analytics
Cisco NX-OS Software SNMP Access Control List Configuration Name Bypass Vulnerability (CVE-2019-1969)
medium Nessus Plugin ID 128760
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Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability that allows an unauthenticated, remote attacker to perform SNMP polling of an affected device, even when it is configured to deny SNMP traffic. The cause of this vulnerability is an incorrect length check when the configured ACL name is 32 ASCII characters (the maximum length). Though the attacker has no control over the configuration of the SNMP ACL name, an attacker can exploit this vulnerability by performing SNMP polling of an affected device. This allows the attacker to perform SNMP polling that should have been denied.With SNMP Version 2c or earlier, to exploit this vulnerability the attacker must know the SNMP read-only community string for the affected system. The community string is a password applied to a device which restricts both read-only and read-write access to the SNMP data on the device. Community strings should be treated like all passwords: they must be non-trivial and changed at regular intervals in accordance with network security policies.
With SNMP Version 3, the attacker must have user credentials for the affected system.
Please see the included Cisco BID and Cisco Security Advisory for more information
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvo17439 or apply the workarounds from the vendor advisory.See Also
Plugin Details
Severity: Medium
ID: 128760
File Name: cisco-sa-20190828-nxos-snmp-bypass.nasl
Version: 1.5
Type: combined
Family: CISCO
Published: 9/13/2019
Updated: 11/27/2019
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 1.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N
CVSS Score Source: CVE-2019-1969
CVSS v3
Risk Factor: Medium
Base Score: 5.3
Temporal Score: 4.6
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:cisco:nx-os
Required KB Items: Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Model, Host/Cisco/NX-OS/Device
Exploit Ease: No known exploits are available
Patch Publication Date: 8/28/2019
Vulnerability Publication Date: 8/28/2019
Reference Information
CVE: CVE-2019-1969