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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1331.3 Cisco IOS XR receives security updates 1 July 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco IOS XR Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Unauthorised Access -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-1712 CVE-2019-1711 CVE-2019-1710 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-asr9k-exr https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-iosxr-pim-dos https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ios-xr-dos Comment: This bulletin contains three (3) Cisco Systems security advisories. Revision History: July 1 2019: Vendor updated Workaround section for: cisco-sa-20190417-iosxr-pim-dos May 6 2019: Added mitigation for cisco-sa-20190417-iosxr-pim-dos April 18 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco IOS XR 64-Bit Software for Cisco ASR 9000 Series Aggregation Services Routers Network Isolation Vulnerability Priority: Critical Advisory ID: cisco-sa-20190417-asr9k-exr First Published: 2019 April 17 16:00 GMT Version 1.0: Final Workarounds: YesCisco Bug IDs: CSCvn56004 CVE-2019-1710 CWE-20 CVSS Score: 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X Summary o A vulnerability in the sysadmin virtual machine (VM) on Cisco ASR 9000 Series Aggregation Services Routers running Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to access internal applications running on the sysadmin VM. The vulnerability is due to incorrect isolation of the secondary management interface from internal sysadmin applications. An attacker could exploit this vulnerability by connecting to one of the listening internal applications. A successful exploit could result in unstable conditions, including both a denial of service and remote unauthenticated access to the device. Cisco has released software updates that address this vulnerability. There are workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-asr9k-exr Affected Products o Vulnerable Products This vulnerability affects Cisco ASR 9000 Series Aggregation Services Routers that are running an affected version of Cisco IOS XR 64-bit Software and have the secondary management interface (physically MGT LAN 1 on the route switch processor (RSP)) connected and configured. To determine if the secondary management interface is connected, log in to the sysadmin virtual machine and use the show interface command. If the secondary management interface is configured and connected, the device is vulnerable as shown in the following example (in dual route switch processor/route processor (RSP/RP) systems, check both active and standby RSP/RP): sysadmin-vm:0_RSP1:eXR# show interface Tue Mar 19 19:32:00.839 UTC MgmtEth0/RSP1/0/0 Link encap: Ethernet HWaddr 08:96:ad:22:7a:31 inet addr: 192.168.0.1 UP RUNNING BROADCAST MULTICAST MTU:1500 Metric:1 RX packets: 14093 errors:0 dropped:1 overruns:0 frame:0 TX packets: 49 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes: 867463 TX bytes: 6889 sysadmin-vm:0_RSP1:eXR# For more information about which Cisco IOS XR Software releases are vulnerable, see the Fixed Software section of this advisory. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Cisco has confirmed that this vulnerability does not affect Cisco IOS-XR 64 bit Software running on platforms other than the ASR9000 Series Aggregation Services Routers. Workarounds o Customers can perform the following workaround, which is equivalent to upgrading to a fixed software release. Although the reload of the sysadmin VM is hitless, Cisco recommends performing this change during a maintenance window: Step 1: Access the sysadmin VM: RP/0/RSP1/CPU0:eXR#admin Tue Mar 12 22:46:37.110 UTC root connected from 127.0.0.1 using console on host Step 2: Run bash and edit the calvados_bootstrap.cfg file: sysadmin-vm:0_RSP1:eXR# run bash Tue Mar 12 22:46:44.224 UTC bash-4.3# vi /etc/init.d/calvados_bootstrap.cfg Step 3: Edit the file by changing: #CTRL_VRF=0 #MGMT_VRF=2 To: CTRL_VRF=0 MGMT_VRF=2 Exit the file and save. In dual RSP/RP systems, the edit must be performed on both active and standby RSP/RPs. Step 4: Reload the sysadmin VM (repeat for both in dual systems): sysadmin-vm:0_RSP1:eXR# reload admin location 0/RSP1 Tue Mar 12 22:49:28.589 UTC Reload node [no,yes] yes result Admin VM graceful reload request on 0/RSP1 succeeded. sysadmin-vm:0_RSP1:eXR# RP/0/RSP1/CPU0:Mar 12 22:49:34.059 UTC: rmf_svr[402]: %PKT_INFRA-FM-3-FAULT_MAJOR : ALARM_MAJOR :RP-RED-LOST-ADMINNR :DECLARE :0/RSP1/CPU0: Confd is down RP/0/RSP1/CPU0:eXR# Wait till the admin VM returns: RP/0/RSP1/CPU0:eXR#0/RSP1/ADMIN0:Mar 12 22:59:30.220 UTC: envmon[3680]: %PKT_INFRA-FM-3-FAULT_MAJOR : ALARM_MAJOR :Power Module redundancy lost :DECLARE :0: RP/0/RSP1/CPU0:Mar 12 22:59:33.708 UTC: rmf_svr[402]: %PKT_INFRA-FM-3-FAULT_MAJOR : ALARM_MAJOR :RP-RED-LOST-ADMINNR :CLEAR :0/RSP1/CPU0: 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 This vulnerability has been fixed in Cisco IOS XR 64-bit Software Release 6.5.3 and 7.0.1, which will edit the calvados_boostrap.cfg file and reload the device. Cisco will not publish a software maintenance upgrade (SMU) for this vulnerability due to the effectiveness of the workaround. 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. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-asr9k-exr Revision History o +---------+--------------------------+---------+--------+----------------+ | Version | Description | Section | Status | Date | +---------+--------------------------+---------+--------+----------------+ | 1.0 | Initial public release. | - | Final | 2019-April-17 | +---------+--------------------------+---------+--------+----------------+ - -------------------------------------------------------------------------------- Cisco IOS XR Software Protocol Independent Multicast Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20190417-iosxr-pim-dos First Published: 2019 April 17 16:00 GMT Last Updated: 2019 June 28 13:51 GMT Version 1.2: Final Workarounds: YesCisco Bug IDs: CSCvg43676 CVE-2019-1712 CWE-20 CVSS Score: 5.8 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L/E:X/RL:X/RC:X Summary o A vulnerability in the Protocol Independent Multicast (PIM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause the PIM process to restart, resulting in a denial of service condition on an affected device. The vulnerability is due to the incorrect processing of crafted AutoRP packets. An attacker could exploit this vulnerability by sending crafted packets to port UDP 496 on a reachable IP address on the device. A successful exploit could allow the attacker to cause the PIM process to restart. There are workarounds that address this vulnerability. This advisory is available at the following link: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190417-iosxr-pim-dos Affected Products o Vulnerable Products This vulnerability affects Cisco IOS XR Software. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o In environments that do not require PIM rendezvous point mappings learned through Auto-RP, administrators can disable the feature with the auto-rp listen disable configuration command as shown in the following example: router pim address-family ipv4 auto-rp listen disable After the configuration has been committed, a restart of the PIM process is required to disable the listening on UDP port 496. The PIM process can be restarted via the process restart pim location all CLI command. Fixed Software o 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 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. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/ cisco-sa-20190417-iosxr-pim-dos Revision History o +---------+------------------------+-------------+--------+---------------+ | Version | Description | Section | Status | Date | +---------+------------------------+-------------+--------+---------------+ | | Added 'location all' | | | | | 1.2 | to 'process restart | Workarounds | Final | 2019-June-28 | | | pim' command. | | | | +---------+------------------------+-------------+--------+---------------+ | 1.1 | Added mitigation. | Workarounds | Final | 2019-May-03 | +---------+------------------------+-------------+--------+---------------+ | 1.0 | Initial public | - | Final | 2019-April-17 | | | release. | | | | +---------+------------------------+-------------+--------+---------------+ - -------------------------------------------------------------------------------- Cisco IOS XR gRPC Software Denial of Service Vulnerability Priority: Medium Advisory ID: cisco-sa-20190417-ios-xr-dos First Published: 2019 April 17 16:00 GMT Version 1.0: Final Workarounds: No workarounds availableCisco Bug IDs: CSCve12615 CVE-2019-1711 CWE-20 CVSS Score: 5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:X/RL:X/RC:X Summary o A vulnerability in the Event Management Service daemon ( emsd ) of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper handling of gRPC requests. An attacker could exploit this vulnerability by repeatedly sending unauthenticated gRPC requests to the affected device. A successful exploit could cause the emsd process to crash, 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-20190417-ios-xr-dos Affected Products o Vulnerable Products The vulnerability affects Cisco IOS XR Software when the gRPC service is enabled on the affected device. For information about affected software releases, consult the Cisco bug ID(s) at the top of this advisory. The following example shows the output of the show running-config | include grpc CLI command on a device that has the gRPC service enabled and configured: Router# show running-config | include grpc grpc ! Products Confirmed Not Vulnerable Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability. Workarounds o There are no workarounds that address this vulnerability. Fixed Software o 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 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. URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190417-ios-xr-dos Revision History o +---------+--------------------------+---------+--------+----------------+ | Version | Description | Section | Status | Date | +---------+--------------------------+---------+--------+----------------+ | 1.0 | Initial public release. | - | Final | 2019-April-17 | +---------+--------------------------+---------+--------+----------------+ - --------------------------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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXRmPbGaOgq3Tt24GAQiTnRAAq3moJRgAM6ptUoEsL+08pDOgE4P40l6z ldcB0n8aTgCfFhTEN3zcRNKdbx4cpoQ5ek9ADgLCw38CBAoZLw4v6hj4VONWuCbA qZduOJt05wv9Rt6x4W92tN93HeJDagrJO+Sa3HyH0isVY/+Wvj6A5mATpfNWM2U7 kPIN8ToGMllTy5xYpA5dO9kKzul3eLjm/HRDNz6joSWXwFScT3qdcYpT97C6pAOX U2niuU1jc0dyZ8ZL8TGzM43E0NVHV0cwnl6UAHqErNSxM+H3vo/jjvfpQTnETKF9 c+p/UW1cz0cUC/PQQiiiao+bTqyZkzK7k9S4Dlqww/LdK/fzys1sGmtbl8JYaH91 mGVLLrijkjRgdjxZmZ2Yn4CX5oyueCfO4Ag/6q7xs/Pp/1DPpjAI8DBoLXQqpxcB GJtQLg8X7vwih1ZhOP3q6dmI+n1uHxap4EY7SXiY9935GFvJtsqQK+px7QlGyrP7 dEC/l/8IOpC/tD8hVJQh4VVYl4B1LiYM/8tzlJJ8ubEa8aipI2McH1rEdtGUV4Mo /YM5ju9o3pJsYfAYCHNpZJg+GuN3n2xU/ZBXpuge1CvHzEYR7ZH6tVmDrD6psjJt z5hIV4HBujhslaWl5win2wKfGs7lhEnTeV5STjDlQMgMSSS4//gjKPjxrwQpn9Yk KTCjh1SMqJU= =/2nX -----END PGP SIGNATURE-----