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L2 Community Safety Management Bypass Flaws Affect A number of Cisco Merchandise

By Ionut Arghire on September 28, 2022

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Cisco this week has confirmed that tens of its enterprise routers and switches are impacted by bypass vulnerabilities within the Layer-2 (L2) community safety controls.

An attacker can bypass the controls supplied by these enterprise units by sending crafted packets that will set off a denial-of-service (DoS) or enable them to carry out a man-in-the-middle (MitM) assault.

A complete of 4 medium-severity safety points have been discovered within the L2 community safety controls, within the Ethernet encapsulation protocols, the CERT Coordination Heart (CERT/CC) on the Carnegie Mellon College notes in an advisory.

Tracked as CVE-2021-27853, CVE-2021-27854, CVE-2021-27861 and CVE-2021-27862, every of those vulnerabilities represents a special sort of bypass of Layer 2 community packet inspection performance.

The bugs enable for stacking of digital native space community (VLAN) headers and 802.2 LLC/SNAP headers, enabling an attacker to bypass a tool’s varied filtering capabilities, together with IPv6 RA Guard, Dynamic ARP inspection, and IPv6 Neighbor Discovery (ND) safety.

“An attacker can bypass safety controls and deceive a regionally related goal host to route site visitors to arbitrary locations. Sufferer units expertise both a DoS (blackholing site visitors) or MitM (observing the unencrypted site visitors and possibly breaking encryption),” CERT/CC’s advisory reads.

CERT/CC says that greater than 200 distributors have been warned of those vulnerabilities, however that solely two of them have confirmed influence, specifically Cisco and Juniper Networks.

Whereas Juniper Networks considers the severity of those bugs to be below their “threshold for publication,” this week Cisco issued an advisory to share particulars on probably impacted units.

The tech big says that a number of enterprise router and swap fashions operating its IOS, IOS XE, IOS XR, and NX-OS software program are impacted, in addition to a number of small enterprise swap fashions, however notes that no firmware replace shall be launched for many of the impacted merchandise.

Based on Cisco, software program releases 17.6.three and 17.8.1 for IOS XE switches include patches for CVE-2021-27853.

CVE-2021-27854 and CVE-2021-27862, Cisco says, don’t influence its merchandise. Nonetheless, whereas investigating the potential influence of CVE-2021-27854 on its entry factors, the tech big recognized one other medium-severity difficulty in these merchandise.

Tracked as CVE-2022-20728, the safety flaw may enable an “unauthenticated, adjoining attacker to inject packets from the native VLAN to shoppers inside nonnative VLANs on an affected gadget,” Cisco explains.

The corporate additionally notes that it’s conscious that proof-of-concept (PoC) exploit code concentrating on these vulnerabilities exists publicly.

Associated: Cisco Patches Excessive-Severity Vulnerabilities in Enterprise Switches

Associated: Cisco Patches Excessive-Severity Vulnerability in Safety Options

Associated: Cisco Patches Crucial Vulnerability in E mail Safety Equipment

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