medium
4.6
CWE
862
Advisory Published
Updated

CVE-2023-20064: Cisco IOS XR Software Bootloader Unauthenticated Information Disclosure Vulnerability

First published: Thu Mar 09 2023(Updated: )

A vulnerability in the GRand Unified Bootloader (GRUB) for Cisco IOS XR Software could allow an unauthenticated attacker with physical access to the device to view sensitive files on the console using the GRUB bootloader command line. This vulnerability is due to the inclusion of unnecessary commands within the GRUB environment that allow sensitive files to be viewed. An attacker could exploit this vulnerability by being connected to the console port of the Cisco IOS XR device when the device is power-cycled. A successful exploit could allow the attacker to view sensitive files that could be used to conduct additional attacks against the device.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco IOS XR<7.9.1
Cisco Asr 9000v-v2
Cisco Asr 9001
Cisco Asr 9006
Cisco Asr 9010
Cisco Asr 9901
Cisco Asr 9902
Cisco Asr 9903
Cisco Asr 9904
Cisco Asr 9906
Cisco Asr 9910
Cisco Asr 9912
Cisco Asr 9922
Cisco Ios Xrv 9000
Cisco Ncs 1001
Cisco Ncs 1002
Cisco Ncs 1004
Cisco IOS XR<7.6.1
Cisco Nc57-18dd-se
Cisco Nc57-24dd
Cisco Nc57-36h-se
Cisco Nc57-36h6d-s
Cisco Ncs 540
Cisco Ncs 540 Fronthaul
Cisco Ncs 5501
Cisco Ncs 5501-se
Cisco Ncs 5502
Cisco Ncs 5502-se
Cisco Ncs 5508
Cisco Ncs 5516
Cisco Ncs 560-4
Cisco Ncs 560-7
Cisco Ncs 57b1-5dse-sys
Cisco Ncs 57b1-6d24-sys
Cisco Ncs 57c1-48q6-sys
Cisco Ncs 57c3-mod-sys
Cisco Ncs 57c3-mods-sys
Cisco IOS XR<7.7.1
Cisco Ncs 5001
Cisco Ncs 5002
Cisco Ncs 5011
Cisco IOS XR
Cisco Ncs 6000

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Reference Links

Frequently Asked Questions

  • What is CVE-2023-20064?

    CVE-2023-20064 is a vulnerability in the GRand Unified Bootloader (GRUB) for Cisco IOS XR Software.

  • How does CVE-2023-20064 affect Cisco devices?

    CVE-2023-20064 could allow an unauthenticated attacker with physical access to the device to view sensitive files on the console using the GRUB bootloader command line.

  • What is the severity of CVE-2023-20064?

    CVE-2023-20064 has a severity rating of 4.6, classified as medium.

  • How can I fix CVE-2023-20064?

    To fix CVE-2023-20064, it is recommended to update to a version of Cisco IOS XR Software that is not vulnerable.

  • Where can I find more information about CVE-2023-20064?

    More information about CVE-2023-20064 can be found in the Cisco Security Advisory at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-load-infodisc-9rdOr5Fq.

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