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SEC Consult SA-20220113-0 :: Cleartext Storage of Phone Password in Cisco IP Phones
From: "SEC Consult Vulnerability Lab, Research" <security-research () sec-consult com>
Date: Thu, 13 Jan 2022 10:04:03 +0000
SEC Consult Vulnerability Lab Security Advisory < 20220113-0 > ======================================================================= title: Cleartext Storage of Phone Password product: Cisco IP Phone Series 78x1, 88x5, 88x1, 7832, 8832, 8821 and 3905 vulnerable version: Firmware <14.1.1, Firmware <11.0(6)SR2 (device model 8821), Firmware <9.4(1)SR5 (device model 3905) fixed version: Firmware 14.1.1, 11.0(6)SR2, 9.4(1)SR5 CVE number: CVE-2022-20660 impact: Medium homepage: https://www.cisco.com found: 2021-04-15 by: Gerhard Hechenberger (Office Vienna) Steffen Robertz (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Atos company Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "The Cisco® IP Phone 7800 Series is a cost-effective, high-fidelity voice communications portfolio designed to improve your organization’s people-centric communications, while reducing your operating costs. It combines an attractive new ergonomic design with “always-on” reliability and secure encrypted communications. The Cisco® IP Phone 7800 Series delivers advanced IP Telephony features and crystal clear wideband audio performance to deliver an easy-to-use, full-featured voice communications experience on Cisco on-premises and hosted infrastructure platforms and third party hosted call control." Source: https://www.cisco.com/c/en/us/products/collateral/collaboration-endpoints/unified-ip-phone-7800-series/data-sheet-c78-729488.html Business recommendation: ------------------------ SEC Consult recommends to update the devices to the newest firmware listed below, where, according to the vendor, the documented issue is fixed. We want to thank Cisco for the very professional response and great coordination. Vulnerability overview/description: ----------------------------------- 1) Cleartext Storage of Phone Password The phone is storing the "phone password", which is needed to access its administrative settings, in cleartext (in multiple locations) in the flash memory. Because the password is not hashed using a suitable cryptographic hash function and the storage is unencrypted, a physical attacker can easily recover the password and reuse it on other phones, if they are not configured to use unique administrative passwords. Proof of concept: ----------------- 1) Cleartext Storage of Phone Password Steps to take: - Configure a phone password via the TFTP XML provisioning feature. - Desoldering the memory and reading its content. - Analyzing the memory content. As example, the Linux command 'strings' can be used below to show the identified password in cleartext in the dumped data. ---------------------------------------- $ strings nand.dump | grep phonePassword phonePassword>sectest</,x phonePassword>sectest</,x phonePassword>sectest</,x phonePassword>sectest</,x ---------------------------------------- Vulnerable / tested versions: ----------------------------- The following firmware/device has been tested: * Cisco IP Phone 7821: Firmware version 12.8.1-0001-455 The vendor confirmed that the following devices are affected: * Cisco IP Phone 78x1 all releases before firmware version 14.1.1 * Cisco IP Phone 88x5 all releases before firmware version 14.1.1 * Cisco IP Phone 88x1 all releases before firmware version 14.1.1 * Cisco IP Phone 7832 all releases before firmware version 14.1.1 * Cisco IP Phone 8832 all releases before firmware version 14.1.1 * Cisco IP Phone 8821 all releases before firmware version 11.0(6)SR2 * Cisco IP Phone 3905 all releases before firmware version 9.4(1)SR5 Vendor contact timeline: ------------------------ 2021-05-19: Contacting vendor through psirt () cisco com. Set preliminary release date to 2021-08-07. Received PSIRT case number from Cisco employee. 2021-05-20: Cisco states that the finding has been shared with the development team and is currently being analyzed. 2021-06-30: Cisco confirms affected phone models and communicates expected dates for fixed firmware releases. 2021-07-07: New estimated release date was set to 2022-01-31. 2021-12-27: Cisco informs about the fix and the publishing date 2022-01-12 for their advisory 2022-01-13: Coordinated release of the security advisory. Solution: --------- Update the firmware of the affected devices to the latest available version. See the vendor's security advisory for further information: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ip-phone-info-disc-fRdJfOxA Workaround: ----------- For immediate mitigation, ensure that phones are configured to use unique administrative passwords. Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult, an Atos company Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Atos company. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF Gerhard Hechenberger, Steffen Robertz / @2022 _______________________________________________ Sent through the Full Disclosure mailing list https://nmap.org/mailman/listinfo/fulldisclosure Web Archives & RSS: http://seclists.org/fulldisclosure/
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