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Cisco IOS XR Software IPsec Packet Processor Denial of Service Vulnerability

cisco-sa-iosxr-ipsec-dos-q8UPX6m · Medium · Published · Updated

A vulnerability in the IPsec packet processor of Cisco IOS XR Software could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition for IPsec sessions to an affected device. The vulnerability is due to improper handling of packets by the IPsec packet processor. An attacker could exploit this vulnerability by sending malicious ICMP error messages to an affected device that get punted to the IPsec packet processor. A successful exploit could allow the attacker to deplete IPsec memory, resulting in all future IPsec packets to an affected device being dropped by the device. Manual intervention is required to recover from this situation. Cisco has released software updates that address the vulnerability described in this advisory. There are workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipsec-dos-q8UPX6m

Cisco advisory ·CSAF JSON

Workarounds

To prevent exploitability of this vulnerability, administrators can apply access-control lists (ACLs) that deny ICMP unreachable packets to an affected device.

Customers that do not use any IPsec features can also disable the IPsec processes as shown in the following example:

RP/0/RP0/CPU0:ios#process shutdown ipsec_mp
Fri Feb 21 14:56:03.870 UTC
Process Shutdown of a process could leave the System in an Inconsistent State. Proceed? [confirm]
RP/0/RP0/CPU0:ios#process shutdown ipsec_pp
Fri Feb 21 14:56:09.124 UTC
Process Shutdown of a process could leave the System in an Inconsistent State. Proceed? [confirm]
RP/0/RP0/CPU0:ios#

Note: Shutting down the IPsec processes is not persistent across reloads and would need to be re-applied after every system reload.

CVEsCVE-2020-3190
Cisco Bug IDsCSCvr75998
CVSS ScoreBase 5.8
Base 5.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X
Product Names From Source
Cisco IOS XR Software

CSAF Product Statuses

Product Status Source CVE Rows
Cisco IOS XR Software known_affected cisco_csaf CVE-2020-3190 1

Related Products

Product CVE Evidence
Cisco IOS XR Software CVE-2020-3190 Cisco OpenVuln
Cisco IOS CVE-2020-3190 Cisco OpenVuln
Cisco IOS Software CVE-2020-3190 Cisco OpenVuln