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CiscoCVE-2020-3284

HistoryNov 06, 2020 - 7:15 p.m.

CVE-2020-3284

2020-11-0619:15:14

CWE-284

cisco

web.nvd.nist.gov

cisco

ios xr

software

pxe boot loader

vulnerability

remote code execution

nvd

cve-2020-3284

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.5

Confidence

High

EPSS

0.007

Percentile

80.1%

JSON

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.

Affected configurations

Nvd

Node

ciscoa9k-rsp880-se_firmwareRange<10.65

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp880-seMatch-

Node

ciscoa9k-rsp880-tr_firmwareRange<10.65

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp880-trMatch-

Node

ciscoa99-rp2-se_firmwareRange<14.35

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rp2-seMatch-

Node

ciscoa99-rp2-tr_firmwareRange<14.35

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rp2-trMatch-

Node

ciscoa99-rsp-se_firmwareRange<16.14

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rsp-seMatch-

Node

ciscoa99-rsp-tr_firmwareRange<16.14

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rsp-trMatch-

Node

ciscoa9k-rsp880-lt-se_firmwareRange<17.34

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp880-lt-seMatch-

Node

ciscoa9k-rsp880-lt-tr_firmwareRange<17.34

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp880-lt-trMatch-

Node

ciscoasr-9901-rp_firmwareRange<22.20

AND

ciscoios_xrRange<6.5.2

AND

ciscoasr-9901-rpMatch-

Node

ciscoa99-rp3-se_firmwareRange<30.23

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rp3-seMatch-

Node

ciscoa99-rp3-tr_firmwareRange<30.23

AND

ciscoios_xrRange<6.5.2

AND

ciscoa99-rp3-trMatch-

Node

ciscoa9k-rsp5-se_firmwareRange<31.20

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp5-seMatch-

Node

ciscoa9k-rsp5-tr_firmwareRange<31.20

AND

ciscoios_xrRange<6.5.2

AND

ciscoa9k-rsp5-trMatch-

Node

cisconcs1001_firmwareRange<14.60

AND

ciscoios_xrRange<6.5.2

AND

cisconcs1001Match-

Node

cisconcs1002_firmwareRange<14.60

AND

ciscoios_xrRange<6.5.2

AND

cisconcs1002Match-

Node

cisconcs1004_firmwareRange<14.60

AND

ciscoios_xrRange<6.5.2

AND

cisconcs1004Match-

Node

ciscon540-12z20g-sys-a\/d_firmwareRange<1.15

AND

ciscoios_xrRange<7.2.1

AND

ciscon540-12z20g-sys-a\/dMatch-

Node

ciscon540-24z8q2c-m_firmwareRange<1.15

AND

ciscoios_xrRange<6.5.2

AND

ciscon540-24z8q2c-mMatch-

Node

ciscon540-28z4c-sys-a\/d_firmwareRange<1.15

AND

ciscoios_xrRange<6.5.2

AND

ciscon540-28z4c-sys-a\/dMatch-

Node

ciscon540-acc-sys_firmwareRange<1.15

AND

ciscoios_xrRange<6.5.2

AND

ciscon540-acc-sysMatch-

Node

ciscon540x-16z4g8q2c-a\/d_firmwareRange<1.15

AND

ciscoios_xrRange<6.5.2

AND

ciscon540x-16z4g8q2c-a\/dMatch-

Node

ciscon540x-12z16g-sys-a\/d_firmwareRange<1.15

AND

ciscoios_xrRange<6.5.2

AND

ciscon540x-12z16g-sys-a\/dMatch-

Node

ciscon560-4-sys_firmwareRange<0.14

AND

ciscoios_xrRange7.0.0–7.0.2

AND

ciscon560-4-sysMatch-

Node

ciscon560-7-sys_firmwareRange<0.14

AND

ciscoios_xrRange7.0.0–7.0.2

AND

ciscon560-7-sysMatch-

Node

ciscon560-4-sys_firmwareRange<0.14

AND

ciscoios_xrRange<6.6.25

AND

ciscon560-4-sysMatch-

Node

ciscon560-7-sys_firmwareRange<0.14

AND

ciscoios_xrRange<6.6.25

AND

ciscon560-7-sysMatch-

Node

cisconcs5001_firmwareRange<1.13

AND

ciscoios_xrRange<7.2.1

AND

cisconcs5001Match-

Node

cisconcs5002_firmwareRange<1.13

AND

ciscoios_xrRange<7.2.1

AND

cisconcs5002Match-

Node

cisconcs5011_firmwareRange<1.14

AND

ciscoios_xrRange<7.2.1

AND

cisconcs5011Match-

Node

cisconc55-rp_firmwareRange<9.30

AND

ciscoios_xrRange<6.6.25

AND

cisconc55-rpMatch-

Node

cisconc55-rp-e_firmwareRange<1.21

AND

ciscoios_xrRange<6.6.25

AND

cisconc55-rp-eMatch-

Node

cisconcs-5501_firmwareRange<6.6.25

AND

ciscoios_xrRange<1.21

AND

cisconcs-5501Match-

Node

cisconcs-5501-se_firmwareRange<1.21

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-5501-seMatch-

Node

cisconcs-5502_firmwareRange<1.21

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-5502Match-

Node

cisconcs-5502-se_firmwareRange<1.21

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-5502-seMatch-

Node

cisconcs-55a2-mod-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a2-mod-sMatch-

Node

cisconcs-55a2-mod-hd-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a2-mod-hd-sMatch-

Node

cisconcs-55a2-mod-hx-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a2-mod-hx-sMatch-

Node

cisconcs-55a2-mod-se-s_firmwareRange<6.6.25

AND

ciscoios_xrRange<1.12

AND

cisconcs-55a2-mod-se-sMatch-

Node

cisconcs-55a2-mod-se-h-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a2-mod-se-h-sMatch-

Node

cisconcs-55a1-36h-se-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a1-36h-se-sMatch-

Node

cisconcs-55a1-36h-s_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a1-36h-sMatch-

Node

cisconcs-55a1-24h_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a1-24hMatch-

Node

cisconcs55-a1-48q6h_firmwareRange<1.12

AND

ciscoios_xrRange<6.6.25

AND

cisconcs55-a1-48q6hMatch-

Node

cisconcs-55a1-24q6h-s_firmwareRange<6.6.25

AND

ciscoios_xrRange<6.6.25

AND

cisconcs-55a1-24q6h-sMatch-

VendorProductVersionCPE
ciscoa9k-rsp880-se_firmware*cpe:2.3:o:cisco:a9k-rsp880-se_firmware:*:*:*:*:*:*:*:*
ciscoios_xr*cpe:2.3:o:cisco:ios_xr:*:*:*:*:*:*:*:*
ciscoa9k-rsp880-se-cpe:2.3:h:cisco:a9k-rsp880-se:-:*:*:*:*:*:*:*
ciscoa9k-rsp880-tr_firmware*cpe:2.3:o:cisco:a9k-rsp880-tr_firmware:*:*:*:*:*:*:*:*
ciscoa9k-rsp880-tr-cpe:2.3:h:cisco:a9k-rsp880-tr:-:*:*:*:*:*:*:*
ciscoa99-rp2-se_firmware*cpe:2.3:o:cisco:a99-rp2-se_firmware:*:*:*:*:*:*:*:*
ciscoa99-rp2-se-cpe:2.3:h:cisco:a99-rp2-se:-:*:*:*:*:*:*:*
ciscoa99-rp2-tr_firmware*cpe:2.3:o:cisco:a99-rp2-tr_firmware:*:*:*:*:*:*:*:*
ciscoa99-rp2-tr-cpe:2.3:h:cisco:a99-rp2-tr:-:*:*:*:*:*:*:*
ciscoa99-rsp-se_firmware*cpe:2.3:o:cisco:a99-rsp-se_firmware:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	a9k-rsp880-se_firmware	*	cpe:2.3:o:cisco:a9k-rsp880-se_firmware::::::::
cisco	ios_xr	*	cpe:2.3:o:cisco:ios_xr::::::::
cisco	a9k-rsp880-se	-	cpe:2.3:h:cisco:a9k-rsp880-se:-:::::::*
cisco	a9k-rsp880-tr_firmware	*	cpe:2.3:o:cisco:a9k-rsp880-tr_firmware::::::::
cisco	a9k-rsp880-tr	-	cpe:2.3:h:cisco:a9k-rsp880-tr:-:::::::*
cisco	a99-rp2-se_firmware	*	cpe:2.3:o:cisco:a99-rp2-se_firmware::::::::
cisco	a99-rp2-se	-	cpe:2.3:h:cisco:a99-rp2-se:-:::::::*
cisco	a99-rp2-tr_firmware	*	cpe:2.3:o:cisco:a99-rp2-tr_firmware::::::::
cisco	a99-rp2-tr	-	cpe:2.3:h:cisco:a99-rp2-tr:-:::::::*
cisco	a99-rsp-se_firmware	*	cpe:2.3:o:cisco:a99-rsp-se_firmware::::::::

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CNA Affected

[
  {
    "product": "Cisco IOS XR Software",
    "vendor": "Cisco",
    "versions": [
      {
        "status": "affected",
        "version": "n/a"
      }
    ]
  }
]

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-pxe-unsign-code-exec-qAa78fD2

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

CVSS3

9.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AI Score

9.5

Confidence

High

EPSS

0.007

Percentile

80.1%

JSON

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