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AUSCERT External Security Bulletin Redistribution
ESB-2021.1905
Cisco SD-WAN Software Privilege Escalation Vulnerability
3 June 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: SD-WAN vBond Orchestrator Software
SD-WAN vEdge Cloud Routers
SD-WAN vEdge Routers
SD-WAN vManage Software
SD-WAN vSmart Controller Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1528
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sd-wan-fuErCWwF
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Cisco SD-WAN Software Privilege Escalation Vulnerability
Priority: High
Advisory ID: cisco-sa-sd-wan-fuErCWwF
First Published: 2021 June 2 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx49259
CVE Names: CVE-2021-1528
CWEs: CWE-250
Summary
o A vulnerability in the CLI of Cisco SD-WAN Software could allow an
authenticated, local attacker to gain elevated privileges on an affected
system.
This vulnerability exists because the affected software does not properly
restrict access to privileged processes. An attacker could exploit this
vulnerability by invoking a privileged process in the affected system. A
successful exploit could allow the attacker to perform actions with the
privileges of the root user.
Cisco has released software updates that address this vulnerability. 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-sd-wan-fuErCWwF
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products:
SD-WAN vBond Orchestrator Software
SD-WAN vEdge Cloud Routers
SD-WAN vEdge Routers
SD-WAN vManage Software
SD-WAN vSmart Controller Software
For information about which Cisco software releases are vulnerable, see the
Fixed Software section of this advisory.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not impact Cisco IOS XE
SD-WAN Software.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license:
https://www.cisco.com/c/en/us/products/end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
When considering software upgrades , customers are advised to regularly
consult the advisories for Cisco products, which are available from the
Cisco Security Advisories 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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
Customers are advised to upgrade to an appropriate fixed software release
as indicated in the following table(s):
Cisco SD-WAN Software Release First Fixed Release
18.4 and earlier Not vulnerable
19.2 Not vulnerable
20.1 Not vulnerable
20.3 Not vulnerable
20.4 20.4.2
20.5 20.5.1
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 Cisco would like to thank Julien Legras of Synacktiv for reporting this
vulnerability.
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-sd-wan-fuErCWwF
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-JUN-02 |
+----------+---------------------------+----------+--------+--------------+
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