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AUSCERT External Security Bulletin Redistribution
ESB-2022.4842
Cisco SD-WAN Arbitrary File Deletion Vulnerability
29 September 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Standalone IOS XE SD-WAN Software
SD-WAN vBond Orchestrator Software
SD-WAN vEdge Routers
SD-WAN vManage Software
SD-WAN vSmart Controller Software
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20850
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arb-file-delete-VB2rVcQv
Comment: CVSS (Max): 5.5 CVE-2022-20850 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
CVSS Source: Cisco Systems
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
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Cisco SD-WAN Arbitrary File Deletion Vulnerability
Priority: Medium
Advisory ID: cisco-sa-arb-file-delete-VB2rVcQv
First Published: 2022 September 28 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvm25943
CVE Names: CVE-2022-20850
CWEs: CWE-22
Summary
o A vulnerability in the CLI of stand-alone Cisco IOS XE SD-WAN Software and
Cisco SD-WAN Software could allow an authenticated, local attacker to
delete arbitrary files from the file system of an affected device.
This vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by injecting arbitrary file path
information when using commands in the CLI of an affected device. A
successful exploit could allow the attacker to delete arbitrary files from
the file system of the affected device.
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-arb-file-delete-VB2rVcQv
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products:
Standalone IOS XE SD-WAN Software
SD-WAN vBond Orchestrator Software
SD-WAN vEdge Routers
SD-WAN vManage Software
SD-WAN vSmart Controller Software
For information about which Cisco software releases were vulnerable at the
time of publication, see the Fixed Software section of this advisory. See
the Details section in the bug ID(s) at the top of this advisory for the
most complete and current information.
Note: The standalone Cisco IOS XE SD-WAN release images are separate from
the universal Cisco IOS XE Software releases. The SD-WAN feature set was
first integrated into the universal Cisco IOS XE Software releases starting
with IOS XE Software Release 17.2.1r. For additional information, see the
Install and Upgrade Cisco IOS XE Release 17.2.1r and Later chapter of the
Cisco SD-WAN Getting Started Guide .
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 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 release information in the following table
(s) was accurate. See the Details section in the bug ID(s) at the top of
this advisory for the most complete and current information.
The left column lists Cisco software releases, and the right column
indicates whether a release was affected by the vulnerability that is
described in this advisory and which release included the fix for this
vulnerability.
Cisco Standalone IOS XE SD-WAN Releases First Fixed Release
16.9 Migrate to a fixed release.
16.10 16.10.1
16.11 Not affected.
16.12 Not affected.
Cisco SD-WAN Software Releases First Fixed Release
18.3 and earlier Migrate to a fixed release.
18.4 18.4.5
19.2 Not affected.
20.3 Not affected.
20.6 Not affected.
20.9 Not affected.
The Cisco Product Security Incident Response Team (PSIRT) validates only
the affected and fixed release information that is documented in this
advisory.
Exploitation and Public Announcements
o The Cisco 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 by James
Spadaro of the Cisco Advanced Security Initiatives Group (ASIG).
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.
Related to This Advisory
o
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arb-file-delete-VB2rVcQv
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2022-SEP-28 |
+----------+---------------------------+----------+--------+--------------+
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