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AUSCERT External Security Bulletin Redistribution
ESB-2021.0779
Cisco IP Phones Buffer Overflow and Denial of Service Vulnerabilities
4 March 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco IP Phone Series 68xx/78xx/88xx
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-1379
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3
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Cisco IP Phones Buffer Overflow and Denial of Service Vulnerabilities
Priority: Medium
Advisory ID: cisco-sa-ipphone-rce-dos-U2PsSkz3
First Published: 2021 March 3 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvu59329 CSCvu59330 CSCvu59335 CSCvu59346 CSCvu59349
CSCvu59351 CSCvu59353
CVE Names: CVE-2021-1379
CWEs: CWE-120
Summary
o Multiple vulnerabilities in the Cisco Discovery Protocol and Link Layer
Discovery Protocol (LLDP) implementations for Cisco IP Phone Series 68xx/
78xx/88xx could allow an unauthenticated, adjacent attacker to execute code
remotely or cause a reload of an affected IP phone.
These vulnerabilities are due to missing checks when the IP phone processes
a Cisco Discovery Protocol or LLDP packet. An attacker could exploit these
vulnerabilities by sending a malicious Cisco Discovery Protocol or LLDP
packet to the targeted IP phone. A successful exploit could allow the
attacker to execute code on the affected IP phone or cause it to reload
unexpectedly, resulting in a denial of service (DoS) condition.
Note : Cisco Discovery Protocol is a Layer 2 protocol. To exploit these
vulnerabilities, an attacker must be in the same broadcast domain as the
affected device (Layer 2 adjacent).
Cisco has released software updates that address these vulnerabilities.
There are no workarounds that address these vulnerabilities.
This advisory is available at the following link:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-rce-dos-U2PsSkz3
Affected Products
o Vulnerable Products
At the time of publication, these vulnerabilities affected the following
Cisco IP phones with Cisco Discovery Protocol or LLDP enabled and running a
vulnerable firmware release:
IP Conference Phone 7832
IP Conference Phone 7832 with Multiplatform Firmware
IP Conference Phone 8832
IP Conference Phone 8832 with Multiplatform Firmware
IP Phone 6821, 6841, 6851, 6861, 6871 with Multiplatform Firmware
IP Phone 7811, 7821, 7841, 7861 Desktop Phones
IP Phone 7811, 7821, 7841, 7861 Desktop Phones with Multiplatform
Firmware
IP Phone 8811, 8841, 8851, 8861, 8845, 8865 Desktop Phones
IP Phone 8811, 8841, 8851, 8861, 8845, 8865 Desktop Phones with
Multiplatform Firmware
Unified IP Conference Phone 8831
Unified IP Conference Phone 8831 for Third-Party Call Control
Wireless IP Phone 8821, 8821-EX
Cisco SPA525G 5-Line IP Phone
Cisco Discovery Protocol and LLDP are enabled by default on most IP Phone
models.
For information about which Cisco software releases are vulnerable, 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.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by these vulnerabilities.
Cisco has confirmed that these vulnerabilities do not affect the following
Cisco products:
Cisco Unified IP Phone 6901
Cisco Unified IP Phone 6911
Cisco ATA 191 Analog Telephone Adapter
Cisco ATA 190 Analog Telephone Adapter
Webex Room Phone
Cisco Unified IP Phone 3905
Cisco SPA112 2-Port Phone Adapter
Cisco SPA122 Analog Telephone Adapter (ATA) with Router
Cisco SPA232D Multi-Line DECT Analog Telephone Adapter (ATA)
Cisco IP DECT 6800 Series with Multiplatform Firmware
Workarounds
o There are no workarounds that address these vulnerabilities.
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 vulnerabilities described
in this advisory and which release included the fix for these
vulnerabilities.
Cisco IP Phone Model Cisco Bug First Fixed Release
ID
IP Conference Phone 8832 with
Multiplatform Firmware
IP Conference Phone 7832 with
Multiplatform Firmware
IP Phone 6821, 6841, 6851, 6861, 6871
with Multiplatform Firmware CSCvu59335 11.3(2)
IP Phone 7811, 7821, 7841, 7861 Desktop
Phones with Multiplatform Firmware
IP Phone 8811, 8841, 8851, 8861, 8845,
8865 Desktop Phones with Multiplatform
Firmware
IP Phone 8811, 8841, 8851, 8861, 8845,
8865 Desktop Phones
IP Conference Phone 7832 CSCvu59349 12.8(1)SR1
IP Conference Phone 8832
IP Phone 7811, 7821, 7841, 7861 Desktop
Phones
Unified IP Conference Phone 8831 CSCvu59346 10.3(1)SR7. Target
release May 2021
Unified IP Conference Phone 8831 for There is no fixed
Third-Party Call Control CSCvu59330 firmware available at
this time.
There is no fixed
SPA525G 5-Line IP Phone CSCvu59329 firmware available at
this time.
There is no fixed
Cisco Unified IP Phone 7900 Series CSCvu59353 firmware available at
this time.
Wireless IP Phone 8821 and 8821-EX CSCvu59351 11.0(6.6)
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 vulnerabilities that are
described in this advisory.
Source
o Cisco would like to thank Qian Chen of Qihoo 360 Nirvan Team for reporting
these vulnerabilities.
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-ipphone-rce-dos-U2PsSkz3
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-MAR-03 |
+----------+---------------------------+----------+--------+--------------+
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