#VU80769 Permissions, Privileges, and Access Controls in Cisco IOS XR - CVE-2023-20190

Vulnerability identifier: #VU80769

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-20190

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Cisco IOS XR
Operating systems & Components / Operating system

Vendor: Cisco Systems, Inc

Description

The vulnerability allows a remote attacker to compromise the target system.

The vulnerability exists due to incorrect destination address range encoding in the compression module in the classic access control list (ACL) compression feature. A remote attacker can bypass configured ACL protections and access trusted networks that the device might be protecting.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: 7.2.0, 7.3, 7.4, 7.5.0, 7.6.0, 7.7.0, 7.8, 7.9

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External links
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-comp3acl-vGmp6BQ3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.