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Cisco NX-OS Software Arbitrary File Overwrite Vulnerability

medium Nessus Plugin ID 128419

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability in the CLI implementation of a specific command used for image maintenance for Cisco NX-OS Software. An authenticated, local attacker can exploit the vulnerability to overwrite any file on the file system including system files. These file overwrites by the attacker are accomplished at the root privilege level. The vulnerability occurs because there is no verification of user-input parameters and or digital-signature verification for image files when using a specific CLI command. An attacker could exploit this vulnerability by authenticating to the device and issuing a command at the CLI. Because an exploit could allow the attacker to overwrite any file on the disk, including system files, a denial of service (DoS) condition could occur. The attacker must have valid administrator credentials for the affected device to exploit this vulnerability.

Please see the included Cisco BIDs and Cisco Security Advisory for more information

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvh76022 and CSCvj03856

See Also

http://www.nessus.org/u?21a0adf7

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvh76022

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvj03856

Plugin Details

Severity: Medium

ID: 128419

File Name: cisco-sa-20190515-nxos-file-write.nasl

Version: 1.6

Type: combined

Family: CISCO

Published: 9/2/2019

Updated: 12/20/2019

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.6

Temporal Score: 4.9

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:C/A:C

CVSS Score Source: CVE-2019-1729

CVSS v3

Risk Factor: Medium

Base Score: 6

Temporal Score: 5.2

Vector: CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H

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: 5/15/2019

Vulnerability Publication Date: 5/15/2019

Reference Information

CVE: CVE-2019-1729

BID: 108378

CWE: 20

CISCO-SA: cisco-sa-20190515-nxos-file-write

IAVA: 2019-A-0173

CISCO-BUG-ID: CSCvh76022, CSCvj03856