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AUSCERT External Security Bulletin Redistribution
ESB-2019.2991.2
Cisco SD-WAN Solution Packet Filtering Bypass Vulnerability
24 February 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco SD-WAN
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1951
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-sd-wan-bypass
Revision History: February 24 2020: Vendor updated vulnerable and
fixed software releases
August 8 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco SD-WAN Solution Packet Filtering Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190807-sd-wan-bypass
First Published: 2019 August 7 16:00 GMT
Last Updated: 2020 February 21 22:48 GMT
Version 2.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvn67202CSCvr64177
CVE-2019-1951
CWE-20
CVSS Score:
5.8 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in the packet filtering features of Cisco SD-WAN Solution
could allow an unauthenticated, remote attacker to bypass L3 and L4 traffic
filters.
The vulnerability is due to improper traffic filtering conditions on an
affected device. An attacker could exploit this vulnerability by crafting a
malicious TCP packet with specific characteristics and sending it to a
target device. A successful exploit could allow the attacker to bypass the
L3 and L4 traffic filters and inject an arbitrary packet in the network.
There are no workarounds that address this vulnerability.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190807-sd-wan-bypass
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they are running Cisco SD-WAN Solution releases earlier than
18.4.4, 19.2.1, or 19.3.0.
vBond Orchestrator Software
vEdge 100 Series Routers
vEdge 1000 Series Routers
vEdge 2000 Series Routers
vEdge 5000 Series Routers
vEdge Cloud Router Platform
vManage Network Management Software
vSmart Controller Software
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories and Alerts page , to determine exposure and a
complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded
contain sufficient memory and confirm that current hardware and software
configurations will continue to be supported properly by the new release.
If the information is not clear, customers are advised to contact the Cisco
Technical Assistance Center (TAC) or their contracted maintenance
providers.
Fixed Releases
At the time of publication, the following Cisco SD-WAN Solution releases
contained the fix for this vulnerability:
18.4.4 and later
19.2.1 and later
19.3.0 and later
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
Exploitation and Public Announcements
o The Cisco Product Security Incident Response Team (PSIRT) is not aware of
any public announcements or malicious use of the vulnerability that is
described in this advisory.
Source
o This vulnerability was found during internal security testing.
Cisco Security Vulnerability Policy
o To learn about Cisco security vulnerability disclosure policies and
publications, see the Security Vulnerability Policy . This document also
contains instructions for obtaining fixed software and receiving security
vulnerability information from Cisco.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190807-sd-wan-bypass
Revision History
o +---------+------------------+----------------+--------+------------------+
| Version | Description | Section | Status | Date |
+---------+------------------+----------------+--------+------------------+
| | Added Cisco bug | Cisco bug IDs | | |
| | ID CSCvr64177. | in advisory | | |
| 2.0 | Updated | header, | Final | 2020-February-21 |
| | vulnerable and | Vulnerable | | |
| | fixed software | Products, | | |
| | releases. | Fixed Releases | | |
+---------+------------------+----------------+--------+------------------+
| 1.0 | Initial public | - | Final | 2019-August-07 |
| | release. | | | |
+---------+------------------+----------------+--------+------------------+
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