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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0535 Cisco Network Convergence System 1000 Series TFTP Directory Traversal Vulnerability 21 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco Network Convergence System 1000 Series Cisco IOS XR Software Publisher: Cisco Systems Operating System: Cisco Impact/Access: Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-1681 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190220-ncs - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco Network Convergence System 1000 Series TFTP Directory Traversal Vulnerability Priority: High Advisory ID: cisco-sa-20190220-ncs First Published: 2019 February 20 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvk32415 CVE-2019-1681 CWE-200 CVSS Score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:X/RL:X/RC:X Summary o A vulnerability in the TFTP service of Cisco Network Convergence System 1000 Series software could allow an unauthenticated, remote attacker to retrieve arbitrary files from the targeted device, possibly resulting in information disclosure. The vulnerability is due to improper validation of user-supplied input within TFTP requests processed by the affected software. An attacker could exploit this vulnerability by using directory traversal techniques in malicious requests sent to the TFTP service on a targeted device. An exploit could allow the attacker to retrieve arbitrary files from the targeted device, resulting in the disclosure of sensitive information. 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-20190220-ncs Affected Products o Vulnerable Products This vulnerability affects Cisco IOS XR Software releases prior to Release 6.5.2 for Cisco Network Convergence System 1000 Series devices when the TFTP service is enabled. Determining the Cisco IOS XR Software Release To determine which Cisco IOS XR Software release is running on a device and the name of the device on which it is running, administrators can log in to the device and use the show version command in the CLI. If the device is running Cisco IOS XR Software, Cisco IOS XR Software or similar text appears in the system banner. The name of the hardware product appears on the line after the location of the system image file. The following example shows the output of the show version command on a Cisco NCS-1001 Network Convergence System 1001 device that is running Cisco IOS XR Software Release 6.5.2: RP/0/RP0/CPU0:MYS-127#show version Cisco IOS XR Software, Version 6.5.2.30I Copyright (c) 2013-2018 by Cisco Systems, Inc. Build Information: Built By : deenayak Built On : Sat Jan 26 23:45:04 PST 2019 Built Host : iox-ucs-023 Workspace : /auto/iox-ucs-023-san2/prod/6.5.2.30I.SIT_IMAGE/ncs1001/ws Version : 6.5.2.30I Location : /opt/cisco/XR/packages/ cisco NCS-1001 () processor System uptime is 2 days 14 hours 54 minutes Customers can run the following command to determine if the TFTP service is enabled and running on a Cisco Network Convergence System 1000 Series device. The device is not vulnerable if the TFTP service is not enabled, and the service is not enabled in default configurations. show processes all | in tftpd Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Other Cisco Network Convergence System series devices are not affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o 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: https://www.cisco.com/c/en/us/products/end-user-license-agreement.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: https://www.cisco.com/c/en/us/support/web/ 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 Cisco fixed this vulnerability in Cisco IOS XR Software Release 6.5.2 for Cisco Network Convergence System 1000 Series devices. Customers can download the software from the Software Center on Cisco.com by doing the following: 1. Click Browse all 2. Navigate to Optical Networking > Optical Data Center Interconnects > Network Convergence System 1000 Series > Network Convergence System 1001 or Network Convergence System 1002 > IOS XR Software 3. Access releases by using the left pane of the Network Convergence System page Exploitation and Public Announcements o 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 o This vulnerability was found during internal security testing. Cisco Security Vulnerability Policy o 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. Subscribe to Cisco Security Notifications o Subscribe URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190220-ncs Revision History o +----------+--------------------------+----------+--------+-------------------+ | Version | Description | Section | Status | Date | +----------+--------------------------+----------+--------+-------------------+ | 1.0 | Initial public release. | -- | Final | 2019-February-20 | +----------+--------------------------+----------+--------+-------------------+ - --------------------------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 iQIVAwUBXG3k/WaOgq3Tt24GAQgXyxAAjG/Qi7+i1jVtF2F7ar/Csz8PZMILdQ6q 2MJn9lPNrBavUg3k7ttNEl2AU3sOz+UDggc5o5ybE9obEHqZuTsuN2vEAC0i1UC9 qpWXtpQx0a+TTytgFqi3PTyi1NrVmxSmSBiYtQJRZjs/u4REazHJjimDkzmOQdgB qK6LJV/PT5AvKqfrhGrRRV7oiPyman/ICnINQWR95a2puz/qijjaAdkVivx9Si7j 6YTiyzraFyHu3lg2UTntDAf26hU0qyGzQHPO+0CF2GO/re1VIakms52fRdag1vo/ fdpHT6F3fgOnTSNb+LhfkK+bVjxcLYOiAeKBGE/BaLLcmNEmlknHNeObngYyU96+ Ai/p04fYywZxqTYT89KrqgTpV2P+geqLh2ks3D5Gqy4w1CNztoGKrLxm5BOYq/91 gOV23g2YgUwcargm6WJjOd/Hctca+6SYdKMqa6mW/I2o1MeVCEokZXYsWuiAgA5/ Vpz3E+lhx9UtJeRWK6uWO7YvY5SMK0pq8O9ZtJp2KB+x44g8+9MSrK/QQXfLy29S lJXtqpT2ipxkcC7mExu/rnw7U5646TvCazFuDAstTjxpkU9GIPCJ4pjEf/fwgAC3 2pOd+zQUgCCKVr0nBtMTgNKpkwkhxk+2tefhqvGeuZ/H7FNM583/I+MtNZbUiaJV HC4BRE+BPr4= =4BFv -----END PGP SIGNATURE-----