description: A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass the protection that is offered by a configured ACL on an affected device.
This vulnerability is due to incorrect destination address range encoding in the compression module of an ACL that is applied to an interface of an affected device. An attacker could exploit this vulnerability by sending traffic through the affected device that should be denied by the configured ACL. A successful exploit could allow the attacker to bypass configured ACL protections on the affected device, allowing the attacker to access trusted networks that the device might be protecting.
There are workarounds that address this vulnerability.
This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .
problem types: Permissions, Privileges, and Access Control
affected:
{
vendor: Cisco
product: Cisco IOS XR Software
versions:
version: 5.2.0, status: affected
version: 5.2.1, status: affected
version: 5.2.2, status: affected
version: 5.2.4, status: affected
version: 5.2.3, status: affected
version: 5.2.5, status: affected
version: 5.2.47, status: affected
version: 5.3.0, status: affected
version: 5.3.1, status: affected
version: 5.3.2, status: affected
version: 5.3.3, status: affected
version: 5.3.4, status: affected
version: 6.0.0, status: affected
version: 6.0.1, status: affected
version: 6.0.2, status: affected
version: 6.1.1, status: affected
version: 6.1.2, status: affected
version: 6.1.3, status: affected
version: 6.1.4, status: affected
version: 6.1.12, status: affected
version: 6.1.22, status: affected
version: 6.1.32, status: affected
version: 6.1.36, status: affected
version: 6.1.42, status: affected
version: 6.2.1, status: affected
version: 6.2.2, status: affected
version: 6.2.3, status: affected
version: 6.2.25, status: affected
version: 6.2.11, status: affected
version: 6.3.2, status: affected
version: 6.3.3, status: affected
version: 6.3.15, status: affected
version: 6.4.1, status: affected
version: 6.4.2, status: affected
version: 6.4.3, status: affected
version: 6.5.1, status: affected
version: 6.5.2, status: affected
version: 6.5.3, status: affected
version: 6.5.25, status: affected
version: 6.5.26, status: affected
version: 6.5.28, status: affected
version: 6.5.29, status: affected
version: 6.5.32, status: affected
version: 6.5.33, status: affected
version: 6.6.2, status: affected
version: 6.6.3, status: affected
version: 6.6.25, status: affected
version: 6.6.4, status: affected
version: 7.0.1, status: affected
version: 7.0.2, status: affected
version: 7.0.12, status: affected
version: 7.0.14, status: affected
version: 7.1.1, status: affected
version: 7.1.15, status: affected
version: 7.1.2, status: affected
version: 7.1.3, status: affected
version: 6.7.1, status: affected
version: 6.7.2, status: affected
version: 6.7.3, status: affected
version: 6.7.4, status: affected
version: 7.2.0, status: affected
version: 7.2.1, status: affected
version: 7.2.2, status: affected
version: 7.3.1, status: affected
version: 7.3.15, status: affected
version: 7.3.2, status: affected
version: 7.3.3, status: affected
version: 7.4.1, status: affected
version: 7.4.2, status: affected
version: 6.8.1, status: affected
version: 6.8.2, status: affected
version: 7.5.1, status: affected
version: 7.5.3, status: affected
version: 7.5.2, status: affected
version: 7.6.1, status: affected
version: 7.6.2, status: affected
version: 7.7.1, status: affected
version: 7.7.2, status: affected
version: 6.9.1, status: affected
version: 6.9.2, status: affected
version: 7.8.1, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
baseScore: 5.8
baseSeverity: MEDIUM
attackVector: NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: LOW
availabilityImpact: NONE
]
exploits: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.