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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2268 Cisco ASR 1000 Series Aggregation Services Routers LT2P DoS Vulnerabilities 31 August 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco ASR 1000 Series Routers Publisher: Cisco Systems Operating System: Cisco Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2015-6273 CVE-2015-6268 CVE-2015-6267 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=40684 http://tools.cisco.com/security/center/viewAlert.x?alertId=40685 http://tools.cisco.com/security/center/viewAlert.x?alertId=40690 Comment: This bulletin contains three (3) Cisco Systems security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco ASR 1000 Series Aggregation Services Routers LT2P DoS Vulnerabilities Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 40684 Version: 1 First Published: 2015 August 27 13:34 GMT Last Published: 2015 August 27 13:34 GMT Port: Not available CVE: CVE-2015-6267 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 7.8 CVSS Temporal: 6.4 Version Summary: Cisco ASR 1000 Aggregation Services Routers contain multiple vulnerabilities that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description Multiple vulnerabilities in Cisco ASR 1000 Series Routers configured with Layer 2 Tunneling Protocol (L2TP) could allow an unauthenticated, remote attacker to cause a crash of the Embedded Services Processor (ESP) processing the packet. The vulnerabilities are due to improper processing of crafted L2TP packets. An attacker could exploit the vulnerabilities by sending a crafted L2TP packet to an affected device. An exploit of the vulnerabilities could allow the attacker to cause a reload of the affected platform. Cisco has confirmed these vulnerabilities and released software updates. Warning Indicators At the time this alert was first published, Cisco IOS XE Software for Cisco ASR 1000 Series Routers running releases prior to 2.2.3 and prior to 2.3.0 were vulnerable. Other releases of Cisco IOS XE Software for Cisco ASR 1000 Series Routers may also be affected. IntelliShield Analysis To exploit this vulnerability, the attacker must send crafted L2TP packets to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released bug IDs CSCsw95722 and CSCsw95496 for registered users, which contain additional details and up-to-date lists of affected product versions. Impact An unauthenticated, remote attacker could exploit the vulnerabilities to cause the ESP processing a crafted Layer 2 Tunneling Protocol (L2TP) packet on an affected device to crash. This could cause the affected device to reload, resulting in a denial of service (DoS) condition. Technical Information The vulnerabilities are due to improper processing of crafted L2TP packets by an affected device. An unauthenticated, remote attacker could exploit the vulnerabilities by sending a crafted L2TP packet to a targeted device. An exploit of the vulnerabilities could allow the attacker to cause a reload of the affected device, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to have network access. Administrators can help protect affected systems from external attacks by using a solid firewall strategy. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco IOS XE Software 2.2 .1, .2 Associated Products: N/A LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - ------------------------------------------------------------------------------ Vulnerability Alert Cisco ASR 1000 Series Aggregation Services Routers Crafted UDP Packet DoS Vulnerability Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 40685 Version: 1 First Published: 2015 August 26 21:52 GMT Last Published: 2015 August 26 21:52 GMT Port: Not available CVE: CVE-2015-6268 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 7.8 CVSS Temporal: 6.4 Version Summary: Cisco ASR 1000 Aggregation Services Routers contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description A vulnerability in Cisco ASR 1000 Series Routers configured with IPv4 could allow an unauthenticated, remote attacker to cause a crash of the Embedded Services Processor (ESP) processing the packet. The vulnerability is due to improper processing of crafted UDP packets. An attacker could exploit the vulnerability by sending a crafted UDP packet to an affected device. An exploit of the vulnerability could allow the attacker to cause a reload of the affected platform. Cisco has confirmed the vulnerability and released software updates. Warning Indicators At the time this alert was first published, Cisco IOS XE Software for Cisco ASR 1000 Series Routers running releases prior to 2.2.3 and prior to 2.3.0 were vulnerable. Other releases of Cisco IOS XE Software for Cisco ASR 1000 Series Routers may also be affected. IntelliShield Analysis To exploit this vulnerability, the attacker must send crafted UDP packets to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released bug ID CSCsw95482 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An unauthenticated, remote attacker could exploit the vulnerability to cause the ESP processing a crafted UDP packet on an affected device to crash, causing the affected device to reload and resulting in a denial of service (DoS) condition. Technical Information The vulnerability is due to improper processing of crafted UDP packets by an affected device. An unauthenticated, remote attacker could exploit the vulnerability by sending a crafted UDP packet to a targeted device. An exploit could allow the attacker to cause a reload of the device, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to have network access. Administrators can help protect affected systems from external attacks by using a solid firewall strategy. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco IOS XE Software 2.2 .1, .2 Associated Products: N/A LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - ------------------------------------------------------------------------------ Vulnerability Alert Cisco IOS XE VFR Feature Denial of Service Vulnerabilities Threat Type: CWE-399: Resource Management Errors IntelliShield ID: 40690 Version: 1 First Published: 2015 August 27 23:32 GMT Last Published: 2015 August 27 23:32 GMT Port: Not available CVE: CVE-2015-6273 Urgency: Unlikely Use Credibility: Confirmed Severity: Mild Damage CVSS Base: 7.8 CVSS Temporal: 6.4 Version Summary: Cisco IOS XE Software contains multiple vulnerabilities that could allow an unauthenticated, remote attacker to cause a denial of service condition. Updates are available. Description Multiple vulnerabilities in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a crash of the Embedded Services Processor (ESP) in an affected Cisco ASR 1000 Aggregation Services Router when it processes crafted transit IP packets. The vulnerabilities occur when the Virtual Fragment Reassembly (VFR) feature is automatically enabled either by the Cisco IOS Firewall feature or Network Address Translation (NAT) for IP address conservation feature. Because of the way the VFR feature on an affected device processes various packet types, an attacker could exploit the vulnerabilities by sending crafted transit IP packets to an affected device. Successful exploitation of the vulnerabilities could allow the attacker to cause a reload of the affected platform. Cisco has confirmed these vulnerabilities and released software updates. Warning Indicators At the time this alert was first published, Cisco IOS XE Software releases prior to 3.1.2S were vulnerable. Other releases of Cisco IOS XE Software may also be affected. IntelliShield Analysis To exploit this vulnerability, the attacker must send crafted transit IP packets to the targeted system, making exploitation more difficult in environments that restrict network access from untrusted sources. Cisco indicates through the CVSS score that functional exploit code exists; however, the code is not known to be publicly available. Vendor Announcements Cisco has released bug IDs CSCtf87624, CSCte93229, CSCtd19103, and CSCti63623 for registered users, which contain additional details and up-to-date lists of affected product versions. Impact An unauthenticated, remote attacker could exploit the vulnerabilities to cause the ESP processing crafted transit IP packets on an affected device to crash, which would cause the affected device to reload, resulting in a denial of service (DoS) condition. Technical Information The vulnerabilities are due to improper processing of crafted transit IP packets by the VFR feature on an affected device. An unauthenticated, remote attacker could exploit the vulnerabilities by sending crafted transit IP packets to a targeted device. Successful exploitation of the vulnerabilities could allow the attacker to cause a reload of the affected device, resulting in a DoS condition. Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to have network access. Administrators can help protect affected systems from external attacks by using a solid firewall strategy. Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems. Administrators are advised to monitor affected systems. Patches/Software Cisco customers with active contracts can obtain updates through the Software Center at the following link: Cisco. Cisco customers without contracts can obtain upgrades by contacting the Cisco Technical Assistance Center at 1-800-553-2447 or 1-408-526-7209 or via email at tac@cisco.com. Alert History Initial Release Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco IOS XE Software 2.2 .1, .2, .3 | 3.1S .0, .1 Associated Products: N/A LEGAL DISCLAIMER The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME. - --------------------------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. 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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 iQIVAwUBVePRPX6ZAP0PgtI9AQJ0uQ//fAcKbVz/wodKZZIE2rVU+SXXc9rh0I8P WfAPl6gAHSbXTgtS3+YF1KBAzecLlfAdSJrk8VmUFCqHFAkdGwBO6NDgqv+apgga kF4lIqjcLI0oYfi9JtHwSiEXbBw4OMyYbX3NCnAa8snL5SOvI8hwv002RRUuc18H /OgRBG7k+XVDqSau2LAnOGy4nrA4oty1Lh59sH17m2hVqbyqL541BHpPHHa1CpJ1 2qCUSXPE3rtfpFeki8tl4MjxqfFFrelkPVi8/JrJ9YOR/z/Bv5gF1CUkpODMTMDC axhjxEYZoeJuufZUIcoTSvFacqc1v+Tt84qCDitvwpxBUuPsBG5tXFX8usmdnBNp X6v79trKCJgSquPumqdXwLszxopy64LOEU7Xxy4e3jM3v9RF73+xeRG+X4ers1xB /pickG3pXdjj9ULE/aAiJX7NN0v46kkP+JUG6CBf3FiwewkfC1db1w4TSHg2KTf7 CiAvDTzPuXCovn5Ha4C8xt0l52rvzghAlajREJrKda4tzv7U5hZuK0omDuDQ9XJS NeCHigEuFj9q0NWZOR7gYSP+qpXjfIjT8wfPSGzPgqi835jpyakgN2WTCIfdf5ae v46lPAgraBtlKYrmYg8vNwJ4OZZNPyMZUUyCX3NCBBGS3s3pyNdYSOovoPuHB3sv 9Aln2EClVbo= =1O+O -----END PGP SIGNATURE-----