Products
Cisco IOS XR Software
Source
ykramarz@cisco.com
Tags
CVE-2024-20456 details
Last Modified : July 10, 2024, 4:15 p.m.
Description
A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Cisco Secure Boot functionality and load unverified software on an affected device. To exploit this successfully, the attacker must have root-system privileges on the affected device. This vulnerability is due to an error in the software build process. An attacker could exploit this vulnerability by manipulating the system’s configuration options to bypass some of the integrity checks that are performed during the booting process. A successful exploit could allow the attacker to control the boot configuration, which could enable them to bypass of the requirement to run Cisco signed images or alter the security properties of the running system.
CVSS Score
| 1 | 2 | 3 | 4 | 5 | 6.7 | 7 | 8 | 9 | 10 |
|---|
Weakness
| Weakness | Name | Description |
|---|---|---|
| CWE-732 | Incorrect Permission Assignment for Critical Resource | The product specifies permissions for a security-critical resource in a way that allows that resource to be read or modified by unintended actors. |
CVSS Data
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
HIGH
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Base Score
6.7
Exploitability Score
0.8
Impact Score
5.9
Base Severity
MEDIUM
Vector String : CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
References
| URL | Source |
|---|---|
| https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap | ykramarz@cisco.com |