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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.0777 Cisco IOS XE Software HTTP Command Injection Vulnerability 23 March 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XE Publisher: Cisco Systems Operating System: Cisco Impact/Access: Root Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-3858 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322-xeci - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XE Software HTTP Command Injection Vulnerability High Advisory ID: cisco-sa-20170322-xeci First Published: 2017 March 22 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCuy83069 CVSS Score: Base 8.8, Temporal 8.8 CVE-2017-3858 CWE-20 Summary A vulnerability in the web framework of Cisco IOS XE Software could allow an authenticated, remote attacker to inject arbitrary commands that are executed with root privileges. The vulnerability is due to insufficient input validation of HTTP parameters supplied by the user. An attacker could exploit this vulnerability by authenticating to the device and submitting crafted input to the affected web page parameter. The user must be authenticated to access the affected parameter. A successful exploit could allow the attacker to execute commands with root privileges. 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-20170322-xeci This advisory is part of the March 22, 2017, release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication, which includes five Cisco Security Advisories that describe five vulnerabilities. All the vulnerabilities have a Security Impact Rating of High. For a complete list of the advisories and links to them, see Cisco Event Response: March 2017 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication. Affected Products Vulnerable Products This vulnerability affects Cisco devices running Cisco IOS XE Software Release 16.2.1, if the HTTP Server feature is enabled for the device. The newly redesigned, web-based administration interface was introduced in the Denali 16.2 Release of Cisco IOS XE Software. The web-based administration interface in earlier releases of Cisco IOS XE Software is not affected by this vulnerability. For more information about which Cisco IOS XE Software releases are vulnerable, see the Fixed Software section of this advisory. Determining the Cisco IOS XE Software Release To determine which Cisco IOS XE Software release is running on a device, administrators can log in to the device, use the show version command in the CLI, and then refer to the system banner that appears. If the device is running Cisco IOS XE Software, the system banner displays Cisco IOS XE Software or similar text. The following example shows the output of the show version command on a device that is running Cisco IOS XE Software Release 3.16.1aS: Router> show version Cisco IOS XE Software, Version 03.16.01a.S - Extended Support Release Cisco IOS Software, ASR1000 Software (PPC_LINUX_IOSD-ADVENTERPRISEK9-M), Version 15.5(3)S1a, RELEASE SOFTWARE (fc1) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2015 by Cisco Systems, Inc. Compiled Wed 04-Nov-15 17:40 by mcpre . . . For information about the naming and numbering conventions for Cisco IOS XE Software releases, see White Paper: Cisco IOS and NX-OS Software Reference Guide. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco IOS Software, Cisco IOS XR Software, or Cisco NX-OS Software. Workarounds There are no workarounds that address this vulnerability. Fixed Software 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: http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html 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: http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html 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 IOS and IOS XE Software To help customers determine their exposure to vulnerabilities in Cisco IOS and IOS XE Software, Cisco provides a tool, the Cisco IOS Software Checker, that identifies any Cisco Security Advisories that impact a specific software release and the earliest release that fixes the vulnerabilities described in each advisory (First Fixed). If applicable, the tool also returns the earliest release that fixes all the vulnerabilities described in all the advisories identified (Combined First Fixed). Customers can use this tool to perform the following tasks: Initiate a search by choosing one or more releases from a drop-down menu or uploading a file from a local system for the tool to parse Enter the output of the show version command for the tool to parse Create a custom search by including all previously published Cisco Security Advisories, a specific advisory, or all advisories in the most recent bundled publication To determine whether a release is affected by any published Cisco Security Advisory, use the Cisco IOS Software Checker on Cisco.com or enter a Cisco IOS Software or Cisco IOS XE Software releasefor example, 15.1(4)M2 or 3.1.4Sin the following field: For a mapping of Cisco IOS XE Software releases to Cisco IOS Software releases, refer to the Cisco IOS XE 2 Release Notes, Cisco IOS XE 3S Release Notes, or Cisco IOS XE 3SG Release Notes, depending on the Cisco IOS XE Software release. Exploitation and Public Announcements 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. Source This vulnerability was reported to Cisco by an internal testing team. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170322-xeci Revision History Version Description Section Status Date 1.0 Initial public release. Final 2017-March-22 - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWNNP5ox+lLeg9Ub1AQjKwA//WMtuaiJSjLsyYkGoyoIlmbWurESnn28Q s1yl9GDGqlxE3NleUHxC7K90UrAqbII5AmznOl+8Aymo5y9f1rCWHeyW6ifQEQuz iX+eQwVIZwM8aWqbvwZzJNnaUm0iXhNf0mZNRFKcvv5o6Y5NvLRVFZ8krYOVMRoR 9sZj9+Oj/22uHAGMJLRpQWKXXgWjly33z7KrpPkRnb38QaWSy8RinKNZTAeaA8cg uqqlgt4pfBH04I7hHRHhIR6jEF9uANEnslC0BSdIsPilRRp2F9g8eG95j/5JKEqo hK+F3CVoVFD7qnH2UoteM4mUYTq80O0cbjBq6oFY4rJGRAdVYnz7chK+HlNqxXZU l3uuBiFD9+ORdSzhWR2E2gFQR6PhmO1H0lCL1Nl/99WMmLMSTo0X2zVYzdFzDOjN qtFFIw2KbeCaLh8BnMi4iM7ldsBDdth3L7VvaKdrLPgtYOSs8RgQkbQkD56u5MgR 8I6eDgky0OgxGZ4YujKmicYJybM3oIDVSLpzGtAr0iD7tHtPgjnkNSzME4hr5TLj UnpX3AvleRf8hRGXhSphB3zn7lPSL2Tv5TdNuAfhAN8I2DBvO4866WTcNXj6toCP U69Ec8vRvSrWkMZLaQzwFQ1eGBZeL/4lQZdVyt8t1Uqa6k7nevXPjctroMm13uuw yOTbcKxyWeE= =OGh8 -----END PGP SIGNATURE-----