NVD

CVE-2021-34718 Detail

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.

Severity

CVSS 3.x Severity and Metrics:

NIST: NVD

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

Nist CVSS score does not match with CNA score

CNA: Cisco Systems, Inc.

Base Score: 8.1 HIGH

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

NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: It is possible that the NVD CVSS may not match that of the CNA. The most common reason for this is that publicly available information does not provide sufficient detail or that information simply was not available at the time the CVSS vector string was assigned.

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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Denotes Vulnerable Software
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Change History

2 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:
09/21/2021
Source:
Cisco Systems, Inc.

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