QID 317357

Date Published: 2023-09-21

QID 317357: Cisco Internetwork Operating System (IOS) XR Software Access Control List Bypass Vulnerability (cisco-sa-dnx-acl-PyzDkeYF)

A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL.

Affected Products
Network Convergence Series (NCS) 540 Series Routers
NCS 560 Series Routers
NCS 5500 Series
NCS 5700 Series

QID Detection Logic (Authenticated):
The check matches Cisco IOS XR version retrieved via Unix Auth using "show version" command.
Note:
1 - This QID does not support IOS XR White box (IOSXRWBD)
2 - This QID does not check for configuration hence set as practice.

A successful exploit could allow the attacker to bypass an ACL on the affected device.

  • CVSS V3 rated as High - 7.5 severity.
  • CVSS V2 rated as Medium - 5 severity.
    • Solution

    Customers are advised to refer to cisco-sa-dnx-acl-PyzDkeYF for more information.

    Vendor References

    CVEs related to QID 317357

    CVE-2023-20191 |
    Software Advisories
    Advisory ID Software Component Link
    cisco-sa-dnx-acl-PyzDkeYF URL Logo sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-dnx-acl-PyzDkeYF
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