A vulnerability in the web-based management interface of Session Initiation Protocol (SIP) Software for Cisco IP Phone 7800 Series and Cisco IP Phone 8800 Series could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code.
The vulnerability exists because the software improperly validates user-supplied input during user authentication. An attacker could exploit this vulnerability by connecting to an affected device using HTTP and supplying malicious user credentials. A successful exploit could allow the attacker to trigger a reload of an affected device, resulting in a DoS condition, or to execute arbitrary code with the privileges of the app user.
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:
This vulnerability affects the following Cisco IP Phone 7800 Series and 8800 Series products running SIP Software prior to the following releases and with the web service feature enabled:
- 10.3(1)SR5 for Unified IP Conference Phone 8831
- 11.0(4)SR3 for Wireless IP Phone 8821 and 8821-EX
- 12.5(1)SR1 for the rest of the IP Phone 7800 and 8800 Series
Note: The web service feature is disabled in SIP Software by default.
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that IP phones running Multiplatform Firmware are not affected by this vulnerability.
There are no workarounds that address this vulnerability.
Cisco has released free software updates that address the vulnerability described in this advisory. 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:
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.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories and Alerts 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:
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.
Cisco fixed this vulnerability in the following SIP Software releases:
- 10.3(1)SR5 and later for Cisco Unified IP Conference Phone 8831
- 11.0(4)SR3 and later for Cisco Wireless IP Phone 8821 and 8821-EX
- 12.5(1)SR1 and later for the rest of the Cisco IP Phone 7800 Series and 8800 Series
Customers can download the SIP Software from the Software Center on Cisco.com by doing the following:
- Click Browse all.
- Choose Collaboration Endpoints > IP Phones > IP Phone 7800 Series or IP Phone 8800 Series > [Model] > Session Initiation Protocol (SIP) Software.
- Access releases by using the left pane of the Session Initiation Protocol (SIP) Software page.
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Cisco would like to thank David Gullasch of modzero AG and Denys Vozniuk of DarkMatter for independently reporting this vulnerability.
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.
Version Description Section Status Date 1.0 Initial public release. — Final 2019-March-20
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