8.1
CWE
88 20
Advisory Published

cisco-sa-iosxr-scp-inject-QwZOCv2: Cisco IOS XR Software Arbitrary File Read and Write Vulnerability

First published: Wed Sep 08 2021(Updated: )

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link:https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-scp-inject-QwZOCv2 This advisory is part of the September 2021 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2021 Cisco IOS XR Software Security Advisory Bundled Publication.

Affected SoftwareAffected VersionHow to fix
Cisco IOS XR Software=7.1.2<NCS560=7.1.2<NCS5500=7.1.2<XRV9K=7.2.2<XRV9K>=7.2.2<=7.2.2<NCS5500>=7.2.1<=7.2.1<NCS1001>=6.7.4<=7.0.1<NCS5500=6.7.3<ASR9K-PX>=6.6.3<=6.6.3<NCS5500>=6.6.12<=6.6.25<NCS5500=6.5.3<XRV9K=6.5.3<ASR9K-PX=6.5.2<NCS5500=6.4.2<ASR9K-PX=6.3.15<NCS5500=6.3.3<ASR9K-PX=6.2.3<ASR9K-PX
NCS560
NCS5500
XRV9K
XRV9K
NCS5500
NCS1001
NCS5500
ASR9K-PX
NCS5500
NCS5500
XRV9K
ASR9K-PX
NCS5500
ASR9K-PX
NCS5500
ASR9K-PX
ASR9K-PX

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability?

    The Cisco IOS XR Software Arbitrary File Read and Write Vulnerability is a vulnerability in the SSH Server process of Cisco IOS XR Software that could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device.

  • What is the severity level of the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability?

    The severity level of the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability is high, with a CVSS score of 8.1.

  • Which Cisco products are affected by the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability?

    The following Cisco products are affected by the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability: NCS560, NCS5500, XRV9K, and NCS1001.

  • How can an attacker exploit the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability?

    An attacker can exploit the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability by using insufficient input validation of arguments that are supplied by the user for a specific file transfer operation.

  • Is there a fix available for the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability?

    Yes, Cisco has released software updates to address the Cisco IOS XR Software Arbitrary File Read and Write Vulnerability. It is recommended to update to the latest available version.

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