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AUSCERT External Security Bulletin Redistribution
ESB-2022.6435.2
Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol
Stack Overflow Vulnerability
30 May 2023
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IP Phone
Publisher: Cisco Systems
Operating System: Cisco
Resolution: Patch/Upgrade
CVE Names: CVE-2022-20968
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipp-oobwrite-8cMF5r7U
Revision History: May 30 2023: Vendor updated the fixed software
December 9 2022: Initial Release
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Cisco IP Phone 7800 and 8800 Series Cisco Discovery Protocol Stack Overflow
Vulnerability
Priority: High
Advisory ID: cisco-sa-ipp-oobwrite-8cMF5r7U
First Published: 2022 December 8 16:00 GMT
Last Updated: 2023 April 27 21:07 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCwb28354
CVE Names: CVE-2022-20968
Summary
o A vulnerability in the Cisco Discovery Protocol processing feature of Cisco
IP Phone 7800 and 8800 Series firmware could allow an unauthenticated,
adjacent attacker to cause a stack overflow on an affected device.
This vulnerability is due to insufficient input validation of received
Cisco Discovery Protocol packets. An attacker could exploit this
vulnerability by sending crafted Cisco Discovery Protocol traffic to an
affected device. A successful exploit could allow the attacker to cause a
stack overflow, resulting in possible remote code execution or a denial of
service (DoS) condition on an 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://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipp-oobwrite-8cMF5r7U
Affected Products
o Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco IP Phone firmware:
IP Phone 7800 Series
IP Phone 8800 Series (except Cisco Wireless IP Phone 8821)
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.
Workarounds
o There are no workarounds that address this vulnerability. However, there is
a mitigation that addresses this vulnerability for deployments that support
both Cisco Discovery Protocol and Link Layer Discovery Protocol (LLDP) for
neighbor discovery. Administrators may disable Cisco Discovery Protocol on
affected IP Phone 7800 and 8800 Series devices. Devices will then use LLDP
for discovery of configuration data such as voice VLAN, power negotiation,
and so on. This is not a trivial change and will require diligence on
behalf of the enterprise to evaluate any potential impact to devices as
well as the best approach to deploy this change in their enterprise.
While this mitigation has been deployed and was proven successful in a test
environment, customers should determine the applicability and effectiveness
in their own environment and under their own use conditions. Customers
should be aware that any workaround or mitigation that is implemented may
negatively impact the functionality or performance of their network based
on intrinsic customer deployment scenarios and limitations. Customers
should not deploy any workarounds or mitigations before first evaluating
the applicability to their own environment and any impact to such
environment.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers with service contracts that entitle
them to regular software updates should obtain security fixes through their
usual update channels.
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.
The Cisco Support and Downloads page on Cisco.com provides information
about licensing and downloads. This page can also display customer device
support coverage for customers who use the My Devices tool.
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
In the following table, the left column lists Cisco software releases. The
right column indicates whether a release is affected by the vulnerability
that is described in this advisory and the first release that includes the
fix for this vulnerability. Customers are advised to upgrade to an
appropriate fixed software release as indicated in this section.
Cisco IP Phone Firmware Release First Fixed Release
14.2 and earlier 14.2(1)
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 aware that proof-of-concept exploit code is available
for the vulnerability described in this advisory and that this
vulnerability has been publicly discussed.
The Cisco PSIRT is not aware of any malicious use of the vulnerability that
is described in this advisory.
Source
o Cisco would like to thank Qian Chen of the Codesafe Team of Legendsec at
QI-ANXIN Group 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.
Subscribe to Cisco Security Notifications
o Subscribe
Related to This Advisory
o
URL
o https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipp-oobwrite-8cMF5r7U
Revision History
o +---------+---------------------------+------------+--------+-------------+
| Version | Description | Section | Status | Date |
+---------+---------------------------+------------+--------+-------------+
| | Updated to indicate that | Summary, | | |
| 1.1 | fixed software has been | Fixed | Final | 2023-APR-27 |
| | released. | Software | | |
+---------+---------------------------+------------+--------+-------------+
| 1.0 | Initial public release. | - | Final | 2022-DEC-08 |
+---------+---------------------------+------------+--------+-------------+
Legal Disclaimer
o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND
OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT
OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A standalone copy or paraphrase of the text of this document that omits the
distribution URL is an uncontrolled copy and may lack important information
or contain factual errors. The information in this document is intended for
end users of Cisco products.
- --------------------------END INCLUDED TEXT--------------------
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