A vulnerability has been found in Cisco IOS (Router Operating System) (version unknown) and classified as critical. This vulnerability affects an unknown function of the component 802.1x Handler. The manipulation as part of a Packet leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A vulnerability in 802.1x function of Cisco IOS Software on the Catalyst 6500 Series Switches could allow an unauthenticated, adjacent attacker to access the network prior to authentication. The vulnerability is due to how the 802.1x packets are handled in the process path. An attacker could exploit this vulnerability by attempting to connect to the network on an 802.1x configured port. A successful exploit could allow the attacker to intermittently obtain access to the network.

The bug was discovered 03/27/2019. The weakness was presented 03/28/2019 as cisco-sa-20190327-c6500 as confirmed advisory (Website). The advisory is available at tools.cisco.com. This vulnerability was named CVE-2019-1758 since 12/06/2018. The attack needs to approached within the local network. No form of authentication is required for a successful exploitation. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 08/17/2023).

The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $5k-$25k. The commercial vulnerability scanner Qualys is able to test this issue with plugin 316407 (Cisco IOS Software Catalyst 6500 Series 802.1x Authentication Bypass Vulnerability(cisco-sa-20190327-c6500)).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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• Router Operating System

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• Cisco

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• IOS

License

• commercial

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