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Cisco Small Business Devices Cross-Site Scripting Vulnerability

Cisco-SA-20120612-CVE-2011-2545 · Medium · Published · Updated

Cisco Small Business Voice Gateways and Analog Telephone Adapters (ATAs) and Cisco Small Business SPA 500 Series IP Phones contain a vulnerability that could allow an unauthenticated, remote attacker to conduct cross-site scripting attacks. The vulnerability is due to a lack of sanitization of user-supplied input in the SIP INVITE request FROM field. An unauthenticated, remote attacker could exploit this vulnerability by sending a crafted SIP INVITE message with injected exploit code. If the user visits the device's web management console (Call Log), the attacker could execute arbitrary script code in the user's browser in the security context of the affected site. Proof-of-concept code is publicly available. Cisco has confirmed this vulnerability and released updated software. To exploit this vulnerability, an attacker must inject a crafted SIP message into the network, which may require access to trusted, internal network resources. This access requirement reduces the exposure of this vulnerability. Additionally, the attacker must then provide a link via e-mail, instant messaging, or another form of communication that directs a user to the affected device's Call Log web page and use misleading language or instructions to persuade the user to follow the provided link. This vulnerability was discovered by Alexander Zaitsev and Gleb Gritsai, Positive Research Center (Positive Technologies Company).

Cisco advisory · CSAF JSON

Workarounds

Administrators are advised to apply the appropriate updates.

Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.

The Cisco Applied Intelligence team has created the following companion document to guide administrators in identifying and mitigating attempts to exploit this vulnerability prior to applying updated software:
Understanding Cross-Site Scripting (XSS) Threat Vectors["http://tools.cisco.com/security/center/content/CiscoAppliedMitigationBulletin/cisco-amb-20060922-understanding-xss"]

Users should verify that unsolicited links are safe to follow.

Administrators are advised to monitor affected systems.

CVEsCVE-2011-2545
Cisco Bug IDsNA
CVSS ScoreBase 4.3
Base 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C/CDP:N/TD:N/CR:ND/IR:ND/AR:ND
Product Names From Source
Cisco Small Business SPA8000 8-Port IP Telephony Gateway, Cisco Small Business SPA8800 Series IP Telephony Gateway, Cisco Small Business SPA2102 Phone Adapter with Router, Cisco Small Business SPA3102 Voice Gateway with Router, Cisco Small Business SPA500 Series IP Phones

Related Products

Product CVE Evidence
Cisco Small Business SPA8800 Series IP Telephony Gateway CVE-2011-2545 Cisco OpenVuln
Cisco Small Business SPA8000 8-Port IP Telephony Gateway CVE-2011-2545 Cisco OpenVuln
Cisco Small Business SPA500 Series IP Phones CVE-2011-2545 Cisco OpenVuln
Cisco Small Business SPA3102 Voice Gateway with Router CVE-2011-2545 Cisco OpenVuln
Cisco Small Business SPA2102 Phone Adapter with Router CVE-2011-2545 Cisco OpenVuln