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AUSCERT External Security Bulletin Redistribution
ESB-2021.3315
Cisco IP Phone Software Arbitrary File Read Vulnerability
7 October 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: IP Phone Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Read-only Data Access -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-34711
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ipphone-arbfileread-NPdtE2Ow
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Cisco IP Phone Software Arbitrary File Read Vulnerability
Priority: Medium
Advisory ID: cisco-sa-ipphone-arbfileread-NPdtE2Ow
First Published: 2021 October 6 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvx85812 CSCvx85813 CSCvx85818 CSCvx85820 CSCvx85821
CSCvx85822 CSCvx85824
CVE Names: CVE-2021-34711
CWEs: CWE-36
Summary
o A vulnerability in the debug shell of Cisco IP Phone software could allow
an authenticated, local attacker to read any file on the device file
system.
This vulnerability is due to insufficient input validation. An attacker
could exploit this vulnerability by providing crafted input to a debug
shell command. A successful exploit could allow the attacker to read any
file on the device file system.
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-ipphone-arbfileread-NPdtE2Ow
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected the following Cisco
products if they were running a vulnerable release of Cisco IP Phone
software:
IP Conference Phone 7832
IP Conference Phone 8832
IP Phone 7800 Series
IP Phone 8800 Series
Wireless IP Phone 8821
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.
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 described in
this advisory and which release included the fix for this vulnerability.
IP Conference Phones 7832 and 8832 and IP Phone 7800 and 8800 Series
Cisco SIP IP Phone Software Release First Fixed Release
Earlier than Release 14.1 Migrate to a fixed release.
14.1 14.1(1)
Wireless IP Phone 8821
Cisco SIP IP Phone Software Release First Fixed Release
Earlier than Release 11.0 Migrate to a fixed release.
11.0 11.0(6)Sr2
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 Cisco would like to thank Jay Lv of Ant Group TianQiong Security Lab 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-ipphone-arbfileread-NPdtE2Ow
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2021-OCT-06 |
+----------+---------------------------+----------+--------+--------------+
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