Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2787 Cisco Wireless LAN Controller Denial of Service Vulnerability 2 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Wireless LAN Controllers Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12282 CVE-2017-12280 CVE-2017-12278 CVE-2017-12275 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc1 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc2 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc3 https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc4 Comment: This bulletin contains four (4) Cisco Systems security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Wireless LAN Controller Simple Network Management Protocol Memory Leak Denial of Service Vulnerability High Advisory ID: cisco-sa-20171101-wlc1 First Published: 2017 November 1 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvc71674 CVSS Score: Base 7.7 CVE-2017-12278 CWE-119 Summary A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco Wireless LAN Controllers could allow an authenticated, remote attacker to cause an affected device to restart, resulting in a denial of service (DoS) condition. The vulnerability is due to a memory leak that occurs on an affected device after the device fails to deallocate a buffer that is used when certain MIBs are polled. An attacker who knows the SNMP Version 2 SNMP Read string or has valid SNMP Version 3 credentials for an affected device could repeatedly poll the affected MIB object IDs (OIDs) and consume available memory on the device. When memory is sufficiently depleted on the device, the device will restart, resulting in a DoS condition. 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-20171101-wlc1 Affected Products Vulnerable Products This vulnerability affects Cisco Wireless LAN Controllers (WLCs) that have SNMP enabled and are running a vulnerable release of Cisco WLC Software. For information about which Cisco WLC Software releases are vulnerable, see the Fixed Software section of this advisory. Assessing the SNMP Configuration To determine whether SNMP is enabled on a device, administrators can issue the show run-config command in the CLI. If the output of the command indicates that the config snmp <1|2|3> enable command is present in the running configuration, SNMP is enabled on the device. Determining the Cisco WLC Software Release To determine which release of Cisco WLC Software is running on a device, administrators can use the web interface or the CLI. To use the web interface, log in to the web interface, click the Monitor tab, and then click Summary in the left pane. The Software Version field shows the release number of the software that is currently running on the device. To use the CLI, issue the show sysinfo command, and then refer to the value in the Product Version field of the command output. The following example shows the output of the command for a device that is running Cisco WLC Software Release 8.3.102.0: (wlc)> show sysinfo Manufacturer's Name.............................. Cisco Systems Inc. Product Name..................................... Cisco Controller Product Version.................................. 8.3.102.0 Bootloader Version............................... 1.0.1 Field Recovery Image Version..................... 6.0.182.0 Firmware Version................................. FPGA 1.3, Env 1.6, USB console 1.27 Build Type....................................... DATA + WPS . . . Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. 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. Fixed Releases Customers should upgrade to an appropriate release as indicated in the table in this section. To help ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories: cisco-sa-20171101-aironet1: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms 802.11 Denial of Service Vulnerability cisco-sa-20171101-aironet2: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms Extensible Authentication Protocol Denial of Service Vulnerability cisco-sa-20171101-wlc1: Cisco Wireless LAN Controller Simple Network Management Protocol Memory Leak Denial of Service Vulnerability cisco-sa-20171101-wlc2: Cisco Wireless LAN Controller 802.11v Basic Service Set Transition Management Denial of Service Vulnerability In the following table, the left column lists releases of Cisco software. The center column indicates the first recommended release that includes the fix for this vulnerability. The right column indicates the first recommended release that includes fixes for all the vulnerabilities described in this collection of advisories. CiscoWireless LAN Recommended Fixed Release for Recommended Fixed Release for Controller SoftwareRelease This Vulnerability All the Vulnerabilities Described in the Collection of Advisories Prior to 8.0 8.0.152.0 8.0.152.0 8.0 8.0.152.0 8.0.152.0 8.1 8.2.164.0 8.2.164.0 8.2 8.2.164.0 8.2.164.0 8.3 8.3.132.0 8.3.132.0 8.4 8.4.100.0 8.4.100.0 8.5 8.5.110.0(future release) 8.5.110.0(future 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. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc1 ============================================================================== Cisco Wireless LAN Controller 802.11v Basic Service Set Transition Management Denial of Service Vulnerability High Advisory ID: cisco-sa-20171101-wlc2 First Published: 2017 November 1 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvb57803 CVSS Score: Base 7.4 CVE-2017-12275 CWE-20 Summary A vulnerability in the implementation of 802.11v Basic Service Set (BSS) Transition Management functionality in Cisco Wireless LAN Controllers could allow an unauthenticated, adjacent attacker to cause an affected device to reload unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to insufficient input validation of 802.11v BSS Transition Management Response packets that an affected device receives from wireless clients. An attacker could exploit this vulnerability by sending a malformed 802.11v BSS Transition Management Response packet to an affected device. A successful exploit could allow the attacker to cause the affected device to reload unexpectedly, resulting in a DoS condition. 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-20171101-wlc2 Affected Products Vulnerable Products This vulnerability affects Cisco Wireless LAN Controllers (WLCs) that are running a vulnerable release of Cisco WLC Software. For information about which Cisco WLC Software releases are vulnerable, see the Fixed Software section of this advisory. Determining the Cisco WLC Software Release To determine which release of Cisco WLC Software is running on a device, administrators can use the web interface or the CLI. To use the web interface, log in to the web interface, click the Monitor tab, and then click Summary in the left pane. The Software Version field shows the release number of the software that is currently running on the device. To use the CLI, issue the show sysinfo command, and then refer to the value in the Product Version field of the command output. The following example shows the output of the command for a device that is running Cisco WLC Software Release 8.3.102.0: (wlc)> show sysinfo Manufacturer's Name.............................. Cisco Systems Inc. Product Name..................................... Cisco Controller Product Version.................................. 8.3.102.0 Bootloader Version............................... 1.0.1 Field Recovery Image Version..................... 6.0.182.0 Firmware Version................................. FPGA 1.3, Env 1.6, USB Console 1.27 Build Type....................................... DATA + WPS . . . Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. 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. Fixed Releases Customers should upgrade to an appropriate release as indicated in the table in this section. To help ensure a complete upgrade solution, consider that this advisory is part of a collection that includes the following advisories: cisco-sa-20171101-aironet1: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms 802.11 Denial of Service Vulnerability cisco-sa-20171101-aironet2: Cisco Aironet 1560, 2800, and 3800 Series Access Point Platforms Extensible Authentication Protocol Denial of Service Vulnerability cisco-sa-20171101-wlc1: Cisco Wireless LAN Controller Simple Network Management Protocol Memory Leak Denial of Service Vulnerability cisco-sa-20171101-wlc2: Cisco Wireless LAN Controller 802.11v Basic Service Set Transition Management Denial of Service Vulnerability In the following table, the left column lists releases of Cisco software. The center column indicates the first recommended release that includes the fix for this vulnerability. The right column indicates the first recommended release that includes fixes for all the vulnerabilities described in this collection of advisories. CiscoWireless LAN Recommended Fixed Release for Recommended Fixed Release for Controller SoftwareRelease This Vulnerability All the Vulnerabilities Described in the Collection of Advisories Prior to 8.0 8.0.152.0 8.0.152.0 8.0 8.0.152.0 8.0.152.0 8.1 8.2.164.0 8.2.164.0 8.2 8.2.164.0 8.2.164.0 8.3 8.3.132.0 8.3.132.0 8.4 8.4.100.0 8.4.100.0 8.5 8.5.110.0(future release) 8.5.110.0(future 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 found during the resolution of a Cisco TAC support case. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc2 ============================================================================== Cisco Wireless LAN Controller CAPWAP Discovery Request Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20171101-wlc3 First Published: 2017 November 1 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvb95842 CVSS Score: Base 6.8 CVE-2017-12280 CWE-119 Summary A vulnerability in the Control and Provisioning of Wireless Access Points (CAPWAP) Discovery Request parsing functionality of Cisco Wireless LAN Controllers could allow an unauthenticated, remote attacker to cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of fields in CAPWAP Discovery Request packets by the affected device. An attacker could exploit this vulnerability by sending crafted CAPWAP Discovery Request packets to an affected device. A successful exploit could allow the attacker to cause the affected device to restart unexpectedly, resulting in a DoS condition. 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-20171101-wlc3 Affected Products Vulnerable Products This vulnerability affects Cisco Wireless LAN Controllers that are running a vulnerable release of Cisco WLC Software and the default device configuration. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Details This vulnerability is due to incomplete input validation of fields in CAPWAP Discovery Request packets. To exploit this vulnerability, the attacker would need to send multiple crafted CAPWAP Discovery Request packets to an affected device. An attacker cannot exploit this vulnerability by sending a single crafted CAPWAP Discovery Request packet to an affected device. In addition, this vulnerability can be exploited only if the contents of the devices memory, which the attacker does not control, are stored in a specific pattern. Workarounds There are no workarounds that address this vulnerability. Fixed Software For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory. 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. 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 found during the resolution of a Cisco TAC support case. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc3 ============================================================================== Cisco Wireless LAN Controller Access Network Query Protocol Denial of Service Vulnerability Medium Advisory ID: cisco-sa-20171101-wlc4 First Published: 2017 November 1 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCve05779 CVSS Score: Base 4.7 CVE-2017-12282 CWE-119 Summary A vulnerability in the Access Network Query Protocol (ANQP) ingress frame processing functionality of Cisco Wireless LAN Controllers could allow an unauthenticated, Layer 2 RF-adjacent attacker to cause an affected device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to incomplete input validation of ANQP query frames by the affected device. An attacker could exploit this vulnerability by sending a malformed ANQP query frame to an affected device that is on an RF-adjacent network. A successful exploit could allow the attacker to cause the affected device to restart unexpectedly, resulting in a DoS condition. 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-20171101-wlc4 Affected Products Vulnerable Products This vulnerability affects Cisco Wireless LAN Controllers that are running a vulnerable release of Cisco WLC Software and are configured to support Hotspot 2.0. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable No other Cisco products are currently known to be affected by this vulnerability. Workarounds There are no workarounds that address this vulnerability. Fixed Software For information about fixed software releases, consult the Cisco bug ID(s) at the top of this advisory. 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. 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 found during the resolution of a Cisco TAC support case. URL https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20171101-wlc4 - --------------------------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: https://www.auscert.org.au/bulletins/ =========================================================================== 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 iQIVAwUBWfqlx4x+lLeg9Ub1AQi1mw/7B4im+0mv/zX3l86tE/nxEGeQRmhjwb// ryTh79Hswoz2v2Gg7egtethQ/K0zF4bbUMO0ginJRAWc1nW/FzvMtLAiZbQMdaoG APWnLAZrFgbFUbp1GbwrvgEfChgQn1p7XKLfirUBQrW3yRrEXPDEpIAxo1pObaNQ q3VSQFIi8cNTSS2GZL5fjZrqv8G/G1ro0WyiWvJoHw1ysko8zydWtUaoghoXLKAX 9NTe3pnECrtJkeWetoxs2wQjikAhFENvprGE64JvaIRmRTPmCAUdPJHlIXhALfCZ 3MKkjwWlhNcGx9jPwNTEpRpOon3ulxBgFmlMi2XbPf3PgudQ914z/m+MNRSfSogE R67ySfCbrtV3iGcK0kS/eOCpVp6rgyeTwPiP3LpgU65b33Xf3GjavmFiFgptW7Uu 3rlrLvagwn5wcHoeyuBxZdZ0sdja3uNpL1Hx4mzpvhDYfK7uIYPDH7yJC0wnlCic vkbJ2FnWEsmYf8PiWJS0Dmip7uFPLQjn48sMrOoilf4m/GiXXkQ2QDs6JlXX5u+7 GojixWxI1LQhb28fKubp+UfcBlu7nExmgDsgW4H6Mi3wBpOo0PQKutDGEsqQjN2q M/nD/wSTiPL9/POyhcrJj9CTEd88kSEgOePRuRv02HW6eD5GJpIPMtaPPsePdwG2 srv8UylBq4E= =uokx -----END PGP SIGNATURE-----