Cisco Security Advisory
Multiple Vulnerabilities in Cisco Unified IP Phones 7900 Series
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Cisco Unified IP Phones 7900 Series devices, also known as TNP phones, are affected by three vulnerabilities that could allow an attacker to elevate privileges, change phone configurations, disclose sensitive information, or load unsigned software. These three vulnerabilities are classified as two privilege escalation vulnerabilities and one signature bypass vulnerability.
Cisco has released software updates that address these vulnerabilities. There are no workarounds available to mitigate these vulnerabilities.
This advisory is posted at https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20110601-phone.
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Only Cisco Unified IP Phones 7900 Series devices, also known as TNP phones, are affected.
Vulnerable Products
The following Cisco Unified IP Phone devices are affected:
- Cisco Unified IP Phone 7975G
- Cisco Unified IP Phone 7971G-GE
- Cisco Unified IP Phone 7970G
- Cisco Unified IP Phone 7965G
- Cisco Unified IP Phone 7962G
- Cisco Unified IP Phone 7961G
- Cisco Unified IP Phone 7961G-GE
- Cisco Unified IP Phone 7945G
- Cisco Unified IP Phone 7942G
- Cisco Unified IP Phone 7941G
- Cisco Unified IP Phone 7941G-GE
- Cisco Unified IP Phone 7931G
- Cisco Unified IP Phone 7911G
- Cisco Unified IP Phone 7906
The following models have reached end-of-life (EOL) status (for hardware only):
- Cisco Unified IP Phone 7971G-GE
- Cisco Unified IP Phone 7970G
- Cisco Unified IP Phone 7961G
- Cisco Unified IP Phone 7961G-GE
- Cisco Unified IP Phone 7941G
- Cisco Unified IP Phone 7941G-GE
- Cisco Unified IP Phone 7906
Refer to the following link to determine what product upgrade and substitution options are available:
http://www.cisco.com/en/US/products/hw/phones/ps379/prod_eol_notices_list.html
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Cisco Unified IP Phones 7900 Series devices are affected by two privilege escalation vulnerabilities and a signature bypass vulnerability. The following sections provide the details of each vulnerability addressed in this security advisory.
Privilege Escalation Vulnerabilities
Cisco Unified IP Phones 7900 Series devices are affected by two privilege escalation vulnerabilities that could allow an authenticated attacker to make unauthorized phone configuration changes or obtain potentially sensitive information.
These vulnerabilities are documented in Cisco bug IDs CSCtf07426 (registered customers only) and CSCtn65815 (registered customers only) and have been assigned Common Vulnerabilities and Exposures (CVE) identifiers CVE-2011-1602 and CVE-2011-1603 respectively.
Signature Verification Bypass Vulnerability
Cisco Unified IP Phones 7900 Series devices are affected by a signature verification bypass vulnerability that could allow an authenticated attacker to load a software image without verification of its signature.
This vulnerability is documented in Cisco bug ID CSCtn65962 (registered customers only) and has been assigned CVE identifier CVE-2011-1637
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There are no workarounds available to mitigate any of these vulnerabilities. Note: All of these vulnerabilities require the attacker to be authenticated.
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When considering software upgrades, also consult http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.
Vulnerability
First Fixed Release
CSCtf07426 - Privilege Escalation with "su" utility
9.0.3
CSCtn65815 - Privilege Escalation in IP Phones
9.2.1
CSCtn65962 - Phones Permits the Installation of Unsigned Code
9.2.1
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The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability described in this advisory.
These vulnerabilities were discovered and reported to Cisco by Matt Duggan of Qualcomm.
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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.
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Show LessRevision 1.0
2011-June-01
Initial public release.
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