Vulnerability Monitor

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CVE-2020-3284

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.

Published

2020-11-06T19:15:14.267

Last Modified

2024-11-21T05:30:43.397

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:C/I:C/A:C

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: COMPLETE
  • Integrity Impact: COMPLETE
  • Availability Impact: COMPLETE
Exploitability Score

8.6

Impact Score

10.0

Weaknesses
  • Type: Secondary
    CWE-284
  • Type: Primary
    NVD-CWE-noinfo
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System cisco a9k-rsp880-se_firmware < 10.65 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp880-se - No
Operating System cisco a9k-rsp880-tr_firmware < 10.65 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp880-tr - No
Operating System cisco a99-rp2-se_firmware < 14.35 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rp2-se - No
Operating System cisco a99-rp2-tr_firmware < 14.35 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rp2-tr - No
Operating System cisco a99-rsp-se_firmware < 16.14 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rsp-se - No
Operating System cisco a99-rsp-tr_firmware < 16.14 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rsp-tr - No
Operating System cisco a9k-rsp880-lt-se_firmware < 17.34 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp880-lt-se - No
Operating System cisco a9k-rsp880-lt-tr_firmware < 17.34 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp880-lt-tr - No
Operating System cisco asr-9901-rp_firmware < 22.20 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco asr-9901-rp - No
Operating System cisco a99-rp3-se_firmware < 30.23 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rp3-se - No
Operating System cisco a99-rp3-tr_firmware < 30.23 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a99-rp3-tr - No
Operating System cisco a9k-rsp5-se_firmware < 31.20 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp5-se - No
Operating System cisco a9k-rsp5-tr_firmware < 31.20 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco a9k-rsp5-tr - No
Operating System cisco ncs1001_firmware < 14.60 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco ncs1001 - No
Operating System cisco ncs1002_firmware < 14.60 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco ncs1002 - No
Operating System cisco ncs1004_firmware < 14.60 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco ncs1004 - No
Operating System cisco n540-12z20g-sys-a\/d_firmware < 1.15 Yes
Operating System cisco ios_xr < 7.2.1 Yes
Hardware cisco n540-12z20g-sys-a\/d - No
Operating System cisco n540-24z8q2c-m_firmware < 1.15 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco n540-24z8q2c-m - No
Operating System cisco n540-28z4c-sys-a\/d_firmware < 1.15 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco n540-28z4c-sys-a\/d - No
Operating System cisco n540-acc-sys_firmware < 1.15 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco n540-acc-sys - No
Operating System cisco n540x-16z4g8q2c-a\/d_firmware < 1.15 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco n540x-16z4g8q2c-a\/d - No
Operating System cisco n540x-12z16g-sys-a\/d_firmware < 1.15 Yes
Operating System cisco ios_xr < 6.5.2 Yes
Hardware cisco n540x-12z16g-sys-a\/d - No
Operating System cisco n560-4-sys_firmware < 0.14 Yes
Operating System cisco ios_xr < 7.0.2 Yes
Hardware cisco n560-4-sys - No
Operating System cisco n560-7-sys_firmware < 0.14 Yes
Operating System cisco ios_xr < 7.0.2 Yes
Hardware cisco n560-7-sys - No
Operating System cisco n560-4-sys_firmware < 0.14 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco n560-4-sys - No
Operating System cisco n560-7-sys_firmware < 0.14 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco n560-7-sys - No
Operating System cisco ncs5001_firmware < 1.13 Yes
Operating System cisco ios_xr < 7.2.1 Yes
Hardware cisco ncs5001 - No
Operating System cisco ncs5002_firmware < 1.13 Yes
Operating System cisco ios_xr < 7.2.1 Yes
Hardware cisco ncs5002 - No
Operating System cisco ncs5011_firmware < 1.14 Yes
Operating System cisco ios_xr < 7.2.1 Yes
Hardware cisco ncs5011 - No
Operating System cisco nc55-rp_firmware < 9.30 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco nc55-rp - No
Operating System cisco nc55-rp-e_firmware < 1.21 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco nc55-rp-e - No
Operating System cisco ncs-5501_firmware < 6.6.25 Yes
Operating System cisco ios_xr < 1.21 Yes
Hardware cisco ncs-5501 - No
Operating System cisco ncs-5501-se_firmware < 1.21 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-5501-se - No
Operating System cisco ncs-5502_firmware < 1.21 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-5502 - No
Operating System cisco ncs-5502-se_firmware < 1.21 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-5502-se - No
Operating System cisco ncs-55a2-mod-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a2-mod-s - No
Operating System cisco ncs-55a2-mod-hd-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a2-mod-hd-s - No
Operating System cisco ncs-55a2-mod-hx-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a2-mod-hx-s - No
Operating System cisco ncs-55a2-mod-se-s_firmware < 6.6.25 Yes
Operating System cisco ios_xr < 1.12 Yes
Hardware cisco ncs-55a2-mod-se-s - No
Operating System cisco ncs-55a2-mod-se-h-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a2-mod-se-h-s - No
Operating System cisco ncs-55a1-36h-se-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a1-36h-se-s - No
Operating System cisco ncs-55a1-36h-s_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a1-36h-s - No
Operating System cisco ncs-55a1-24h_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a1-24h - No
Operating System cisco ncs55-a1-48q6h_firmware < 1.12 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs55-a1-48q6h - No
Operating System cisco ncs-55a1-24q6h-s_firmware < 6.6.25 Yes
Operating System cisco ios_xr < 6.6.25 Yes
Hardware cisco ncs-55a1-24q6h-s - No
References