CVE-2021-1461

Cisco SD-WAN Software Signature Verification Bypass Vulnerability

Published Nov 18, 2024 CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed

Description

A vulnerability in the Image Signature Verification feature of Cisco SD-WAN Software could allow an authenticated, remote attacker with Administrator-level credentials to install a malicious software patch on an affected device.
The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.Cisco has released software updates that address the vulnerability described in this advisory. There are no workarounds that address this vulnerability.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Cisco

Cisco Catalyst SD-WAN Manager

unknown

Version	Status	Constraints
`19.2.1`	affected	—
`18.4.4`	affected	—
`19.3.0`	affected	—
`19.2.2`	affected	—
`19.2.099`	affected	—
`18.3.6`	affected	—
`18.3.7`	affected	—
`19.2.0`	affected	—
`18.3.8`	affected	—
`19.0.0`	affected	—
`19.1.0`	affected	—
`18.4.302`	affected	—
`18.4.303`	affected	—
`19.2.097`	affected	—
`19.2.098`	affected	—
`17.2.10`	affected	—
`18.3.6.1`	affected	—
`19.0.1a`	affected	—
`18.2.0`	affected	—
`18.4.3`	affected	—
`18.4.1`	affected	—
`17.2.8`	affected	—
`18.3.3.1`	affected	—
`18.4.0`	affected	—
`18.3.1`	affected	—
`17.2.6`	affected	—
`17.2.9`	affected	—
`18.3.4`	affected	—
`17.2.5`	affected	—
`18.3.1.1`	affected	—
`18.3.5`	affected	—
`18.4.0.1`	affected	—
`18.3.3`	affected	—
`17.2.7`	affected	—
`17.2.4`	affected	—
`18.3.0`	affected	—
`19.2.3`	affected	—
`19.2.929`	affected	—
`19.2.31`	affected	—
`19.2.32`	affected	—
`19.2.4`	affected	—

Cisco

Cisco SD-WAN vEdge Router

unknown

Version	Status	Constraints
`18.4.303`	affected	—
`18.3.7`	affected	—
`19.3.0`	affected	—
`18.2.0`	affected	—
`19.2.099`	affected	—
`17.2.10`	affected	—
`18.3.3`	affected	—
`18.3.6`	affected	—
`19.0.0`	affected	—
`17.2.6`	affected	—
`18.4.0`	affected	—
`19.1.01`	affected	—
`19.2.098`	affected	—
`18.3.1`	affected	—
`18.4.302`	affected	—
`19.2.2`	affected	—
`18.3.5`	affected	—
`17.2.9`	affected	—
`19.1.0`	affected	—
`19.2.097`	affected	—
`17.2.5`	affected	—
`17.2.8`	affected	—
`18.3.8`	affected	—
`18.3.0`	affected	—
`18.4.3`	affected	—
`18.4.4`	affected	—
`19.2.1`	affected	—
`17.2.4`	affected	—
`18.3.4`	affected	—
`19.0.1a`	affected	—
`17.2.7`	affected	—
`18.4.1`	affected	—
`19.2.0`	affected	—
`19.2.3`	affected	—
`19.2.929`	affected	—
`19.2.31`	affected	—
`19.2.32`	affected	—
`19.2.4`	affected	—

No data.

No data available yet.

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

Source	ID	Title
EUVD	EUVD-2021-6928	A vulnerability in the Image Signature Verification feature of Cisco SD-WAN Software could allow an authenticated, remote attacker with Administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.Cisco has released software updates that address the vulnerability described in this advisory. There are no workarounds that address this vulnerability.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.409% probability within 30 days)

Exploitation none

Automatable no

Technical Impact partial

References

Link	Providers
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk

History

Nov 18, 2024 4:15 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Nov 18, 2024 3:45 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A vulnerability in the Image Signature Verification feature of Cisco SD-WAN Software could allow an authenticated, remote attacker with Administrator-level credentials to install a malicious software patch on an affected device. The vulnerability is due to improper verification of digital signatures for patch images. An attacker could exploit this vulnerability by crafting an unsigned software patch to bypass signature checks and loading it on an affected device. A successful exploit could allow the attacker to boot a malicious software patch image.Cisco has released software updates that address the vulnerability described in this advisory. There are no workarounds that address this vulnerability.
Title		Cisco SD-WAN Software Signature Verification Bypass Vulnerability
Weaknesses		CWE-347
References		https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk
Metrics		cvssV3_1 `{'score': 4.9, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N/RL:X/RC:X/E:X'}`