description: A vulnerability in the PPP over Ethernet (PPPoE) termination feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to crash the ppp_ma process, resulting in a denial of service (DoS) condition.
This vulnerability is due to the improper handling of malformed PPPoE packets that are received on a router that is running Broadband Network Gateway (BNG) functionality with PPPoE termination on a Lightspeed-based or Lightspeed-Plus-based line card. An attacker could exploit this vulnerability by sending a crafted PPPoE packet to an affected line card interface that does not terminate PPPoE. A successful exploit could allow the attacker to crash the ppp_ma process, resulting in a DoS condition for PPPoE traffic across the router.
problem types: Improper Input Validation
affected:
{
vendor: Cisco
product: Cisco IOS XR Software
versions:
version: 5.2.0, status: affected
version: 5.2.2, status: affected
version: 5.2.4, 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: 6.2.1, status: affected
version: 6.2.2, status: affected
version: 6.2.3, status: affected
version: 6.2.25, status: affected
version: 6.3.2, status: affected
version: 6.3.3, status: affected
version: 6.4.1, status: affected
version: 6.4.2, status: affected
version: 6.5.1, status: affected
version: 6.5.2, status: affected
version: 6.5.3, status: affected
version: 6.6.2, status: affected
version: 6.6.3, status: affected
version: 6.6.25, status: affected
version: 7.0.1, status: affected
version: 7.0.2, 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: 7.3.1, status: affected
version: 7.3.2, status: affected
version: 7.3.3, status: affected
version: 7.3.5, 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: 7.5.4, status: affected
version: 7.5.5, 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
version: 7.8.2, status: affected
version: 7.9.1, status: affected
version: 7.9.2, status: affected
}
metrics:
format: cvssV3_1
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
baseScore: 7.4
baseSeverity: HIGH
attackVector: ADJACENT_NETWORK
attackComplexity: LOW
privilegesRequired: NONE
userInteraction: NONE
scope: CHANGED
confidentialityImpact: NONE
integrityImpact: NONE
availabilityImpact: HIGH
]
exploits: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.