NVD

CVE-2021-34718 Detail

Modified

This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.

Description

A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device. This vulnerability is due to insufficient input validation of arguments that are supplied by the user for a specific file transfer method. An attacker with lower-level privileges could exploit this vulnerability by specifying Secure Copy Protocol (SCP) parameters when authenticating to a device. A successful exploit could allow the attacker to elevate their privileges and retrieve and upload files on a device that they should not have access to.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

CNA: Cisco Systems, Inc.

Base Score: 8.1 HIGH

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: 8.5 HIGH

Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:N)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-scp-inject-QwZOCv2	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-88	Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')	NIST Cisco Systems, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

4 change records found show changes

Initial Analysis by NIST 9/21/2021 4:01:33 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		Record truncated, showing 500 of 824 characters. View Entire Change Record AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:asr_9000v-v2:-:::::::* cpe:2.3:h:cisco:asr_9001:-:::::::* cpe:2.3:h:cisco:asr_9006:-:::::::* cpe:2.3:h:cisco:asr_9010:-:::::::* cpe:2.3:h:cisco:asr_9901:-:::::::* cpe:2.3:h:cisco:asr_99
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ios_xrv:-:::::::* cpe:2.3:h:cisco:ios_xrv_9000:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_1001:-:::::::* cpe:2.3:h:cisco:ncs_1002:-:::::::* cpe:2.3:h:cisco:ncs_1004:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_4009:-:::::::* cpe:2.3:h:cisco:ncs_4016:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_5001:-:::::::* cpe:2.3:h:cisco:ncs_5002:-:::::::* cpe:2.3:h:cisco:ncs_5011:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_520:-:::::::* cpe:2.3:h:cisco:ncs_540:-:::::::* cpe:2.3:h:cisco:ncs_540_fronthaul:-:::::::* cpe:2.3:h:cisco:ncs_560-4:-:::::::* cpe:2.3:h:cisco:ncs_560-7:-:::::::*
Added	CPE Configuration		Record truncated, showing 500 of 520 characters. View Entire Change Record AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_5501:-:::::::* cpe:2.3:h:cisco:ncs_5501-se:-:::::::* cpe:2.3:h:cisco:ncs_5502:-:::::::* cpe:2.3:h:cisco:ncs_5502-se:-:::::::* cpe:2.3:h:cisco:ncs_5508:-:::::::* cpe:2.3:h:cisco:ncs_
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:ios_xr::::::::* versions up to (excluding) 7.3.2 cpe:2.3:o:cisco:ios_xr::::::::* versions from (including) 7.4.0 up to (excluding) 7.4.1 OR cpe:2.3:h:cisco:ncs_6000:-:::::::* cpe:2.3:h:cisco:ncs_6008:-:::::::*
Added	CVSS V2		NIST (AV:N/AC:L/Au:S/C:C/I:C/A:N)
Added	CVSS V3.1		NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Added	CWE		NIST CWE-88
Changed	Reference Type	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-scp-inject-QwZOCv2 No Types Assigned	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-scp-inject-QwZOCv2 Vendor Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-34718
NVD Published Date:
09/09/2021
NVD Last Modified:
11/06/2023
Source:
Cisco Systems, Inc.

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