Cisco IOS XR up to 7.5.1 Broadband Network Gateway PPP over Ethernet error condition

Summaryinfo

A vulnerability, which was classified as problematic, was found in Cisco IOS XR. Affected is an unknown function of the component Broadband Network Gateway PPP over Ethernet. Executing a manipulation can lead to error condition. The identification of this vulnerability is CVE-2022-20849. The attack needs to be done within the local network. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Cisco IOS XR. This vulnerability affects some unknown functionality of the component Broadband Network Gateway PPP over Ethernet. The manipulation with an unknown input leads to a error condition vulnerability. The CWE definition for the vulnerability is CWE-391. [PLANNED FOR DEPRECATION. SEE MAINTENANCE NOTES AND CONSIDER CWE-252, CWE-248, OR CWE-1069.] Ignoring exceptions and other error conditions may allow an attacker to induce unexpected behavior unnoticed. As an impact it is known to affect availability. CVE summarizes:

A vulnerability in the Broadband Network Gateway PPP over Ethernet (PPPoE) feature of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause the PPPoE process to continually crash. This vulnerability exists because the PPPoE feature does not properly handle an error condition within a specific crafted packet sequence. An attacker could exploit this vulnerability by sending a sequence of specific PPPoE packets from controlled customer premises equipment (CPE). A successful exploit could allow the attacker to cause the PPPoE process to continually restart, resulting in a denial of service condition (DoS).Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2022 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .

The advisory is available at sec.cloudapps.cisco.com. This vulnerability was named CVE-2022-20849 since 11/02/2021. The exploitation appears to be difficult. The attack can only be initiated 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.

Upgrading eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• Cisco

Name

• IOS XR

Version

• 6.5.1
• 6.5.2
• 6.5.3
• 6.5.15
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.25
• 6.7.1
• 6.7.2
• 6.7.3
• 6.7.35
• 6.8.1
• 6.8.2
• 6.9.1
• 7.0.1
• 7.0.2
• 7.0.90
• 7.1.1
• 7.1.2
• 7.1.3
• 7.1.15
• 7.1.25
• 7.2.1
• 7.2.2
• 7.3.1
• 7.3.2
• 7.3.3
• 7.3.4
• 7.4.1
• 7.4.2
• 7.5.1

License

• commercial

Website

• Vendor: https://www.cisco.com/

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