CVE-2019-1846

Current Description

A vulnerability in the Multiprotocol Label Switching (MPLS) Operations, Administration, and Maintenance (OAM) implementation of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to trigger a denial of service (DoS) condition on an affected device. The vulnerability is due to the incorrect handling of certain MPLS OAM packets. An attacker could exploit this vulnerability by sending malicious MPLS OAM packets to an affected device. A successful exploit could allow the attacker to cause the lspv_server process to crash. The crash could lead to system instability and the inability to process or forward traffic though the device, resulting in a DoS condition that require manual intervention to restore normal operating conditions.

Basic Data

Published	May 16, 2019
Last Modified	October 09, 2019
Assigner	cve@mitre.org
Data Type	CVE
Data Format	MITRE
Data Version	4.0
Problem Type	CWE-20
CVE Data Version	4.0

Base Metric V2

CVSS 2 - Version	2.0
CVSS 2 - Vector String	AV:A/AC:L/Au:N/C:N/I:N/A:C
CVSS 2 - Access Vector	ADJACENT_NETWORK
CVSS 2 - Access Complexity	LOW
CVSS 2 - Authentication	NONE
CVSS 2 - Confidentiality Impact	NONE
CVSS 2 - Availability Impact	COMPLETE
CVSS 2 - Base Score	6.1
Severity	MEDIUM
Exploitability Score	6.5
Impact Score	6.9
Obtain All Privilege	false
Obtain User Privilege	false
Obtain Other Privilege	false

Base Metric V3

CVSS 3 - Version	3.0
CVSS 3 - Vector String	CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
CVSS 3 - Attack Vector	ADJACENT_NETWORK
CVSS 3 - Attack Complexity	LOW
CVSS 3 - Privileges Required	NONE
CVSS 3 - User Interaction	NONE
CVSS 3 - Scope	CHANGED
CVSS 3 - Confidentiality Impact	NONE
CVSS 3 - Integrity Impact	NONE
CVSS 3 - Availability Impact	HIGH
CVSS 3 - Base Score	7.4
CVSS 3 - Base Severity	HIGH
Exploitability Score	2.8
Base Severity	HIGH

Configurations

AND

OR - Configuration 1

Cpe Version	Part	Vendor	Product	Version	Update	Edition	Language	SW Edition	Target SW	Target HW	Other	Version Start Including	Version End Including	Version Start Excluding	Version End Excluding
2.3	OS	Cisco	Ios Xr	5.3.3	sp10	*	*	*	*	*	*

OR Running on/with:

Cpe Version	Part	Vendor	Product	Version	Update	Edition	Language	SW Edition	Target SW	Target HW	Other
2.3	Hardware	Cisco	Asr 9000v	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9001	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9006	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9010	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9901	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9904	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9906	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9910	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9912	-	*	*	*	*	*	*	*
2.3	Hardware	Cisco	Asr 9922	-	*	*	*	*	*	*	*

Vulnerable Software List

Vendor	Product	Versions
Cisco	Ios Xr	5.3.3

References

Name	Source	URL	Tags
108363	http://www.securityfocus.com/bid/108363	BID	Third Party Advisory VDB Entry
20190515 Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers MPLS OAM Denial of Service Vulnerability	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190515-asr9k-mpls-d	CISCO	Vendor Advisory