critical
9.8
CWE
284
Advisory Published
Updated

CVE-2020-3284: Cisco IOS XR Software Enhanced Preboot eXecution Environment Unsigned Code Execution Vulnerability

First published: Fri Nov 06 2020(Updated: )

A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE boot process on an affected device. The PXE boot loader is part of the BIOS and runs over the management interface of hardware platforms that are running Cisco IOS XR Software only. The vulnerability exists because internal commands that are issued when the PXE network boot process is loading a software image are not properly verified. An attacker could exploit this vulnerability by compromising the PXE boot server and replacing a valid software image with a malicious one. Alternatively, the attacker could impersonate the PXE boot server and send a PXE boot reply with a malicious file. A successful exploit could allow the attacker to execute unsigned code on the affected device. Note: To fix this vulnerability, both the Cisco IOS XR Software and the BIOS must be upgraded. The BIOS code is included in Cisco IOS XR Software but might require additional installation steps. For further information, see the Fixed Software section of this advisory.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco A9k-rsp880-se Firmware<10.65
Cisco IOS XR<6.5.2
Cisco A9k-rsp880-se
Cisco A9k-rsp880-tr Firmware<10.65
Cisco A9k-rsp880-tr
Cisco A99-rp2-se Firmware<14.35
Cisco A99-rp2-se
Cisco A99-rp2-tr Firmware<14.35
Cisco A99-rp2-tr
Cisco A99-rsp-se Firmware<16.14
Cisco A99-rsp-se
Cisco A99-rsp-tr Firmware<16.14
Cisco A99-rsp-tr
Cisco A9k-rsp880-lt-se Firmware<17.34
Cisco A9k-rsp880-lt-se
Cisco A9k-rsp880-lt-tr Firmware<17.34
Cisco A9k-rsp880-lt-tr
Cisco Asr-9901-rp Firmware<22.20
Cisco Asr-9901-rp
Cisco A99-rp3-se Firmware<30.23
Cisco A99-rp3-se
Cisco A99-rp3-tr Firmware<30.23
Cisco A99-rp3-tr
Cisco A9k-rsp5-se Firmware<31.20
Cisco A9k-rsp5-se
Cisco A9k-rsp5-tr Firmware<31.20
Cisco A9k-rsp5-tr
Cisco Ncs1001 Firmware<14.60
Cisco Ncs1001
Cisco Ncs1002 Firmware<14.60
Cisco Ncs1002
Cisco Ncs1004 Firmware<14.60
Cisco Ncs1004
Cisco N540-12z20g-sys-a\/d Firmware<1.15
Cisco IOS XR<7.2.1
Cisco N540-12z20g-sys-a\/d
Cisco N540-24z8q2c-m Firmware<1.15
Cisco N540-24z8q2c-m
Cisco N540-28z4c-sys-a\/d Firmware<1.15
Cisco N540-28z4c-sys-a\/d
Cisco N540-acc-sys Firmware<1.15
Cisco N540-acc-sys
Cisco N540x-16z4g8q2c-a\/d Firmware<1.15
Cisco N540x-16z4g8q2c-a\/d
Cisco N540x-12z16g-sys-a\/d Firmware<1.15
Cisco N540x-12z16g-sys-a\/d
Cisco N560-4-sys Firmware<0.14
Cisco IOS XR>=7.0.0<7.0.2
Cisco N560-4-sys
Cisco N560-7-sys Firmware<0.14
Cisco N560-7-sys
Cisco IOS XR<6.6.25
Cisco Ncs5001 Firmware<1.13
Cisco Ncs5001
Cisco Ncs5002 Firmware<1.13
Cisco Ncs5002
Cisco Ncs5011 Firmware<1.14
Cisco Ncs5011
Cisco Nc55-rp Firmware<9.30
Cisco Nc55-rp
Cisco Nc55-rp-e Firmware<1.21
Cisco Nc55-rp-e
Cisco Ncs-5501 Firmware<6.6.25
Cisco IOS XR<1.21
Cisco Ncs-5501
Cisco Ncs-5501-se Firmware<1.21
Cisco Ncs-5501-se
Cisco Ncs-5502 Firmware<1.21
Cisco Ncs-5502
Cisco Ncs-5502-se Firmware<1.21
Cisco Ncs-5502-se
Cisco Ncs-55a2-mod-s Firmware<1.12
Cisco Ncs-55a2-mod-s
Cisco Ncs-55a2-mod-hd-s Firmware<1.12
Cisco Ncs-55a2-mod-hd-s
Cisco Ncs-55a2-mod-hx-s Firmware<1.12
Cisco Ncs-55a2-mod-hx-s
Cisco Ncs-55a2-mod-se-s Firmware<6.6.25
Cisco IOS XR<1.12
Cisco Ncs-55a2-mod-se-s
Cisco Ncs-55a2-mod-se-h-s Firmware<1.12
Cisco Ncs-55a2-mod-se-h-s
Cisco Ncs-55a1-36h-se-s Firmware<1.12
Cisco Ncs-55a1-36h-se-s
Cisco Ncs-55a1-36h-s Firmware<1.12
Cisco Ncs-55a1-36h-s
Cisco Ncs-55a1-24h Firmware<1.12
Cisco Ncs-55a1-24h
Cisco Ncs55-a1-48q6h Firmware<1.12
Cisco Ncs55-a1-48q6h
Cisco Ncs-55a1-24q6h-s Firmware<6.6.25
Cisco Ncs-55a1-24q6h-s

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