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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1690 Cisco AnyConnect Secure Mobility Client Certificate Bypass Vulnerability 7 June 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco AnyConnect Secure Mobility Client Publisher: Cisco Systems Operating System: Windows Linux variants Mac OS Android Apple iOS Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-0334 Original Bulletin: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-AnyConnect-cert-bypass - --------------------------BEGIN INCLUDED TEXT-------------------- Cisco AnyConnect Secure Mobility Client Certificate Bypass Vulnerability Medium Advisory ID: cisco-sa-20180606-AnyConnect-cert-bypass First Published: 2018 June 6 16:00 GMT Version 1.0: Final Workarounds: No workarounds available Cisco Bug IDs: CSCvh23141 CVSS Score: Base 4.8 CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:X/RL:X/RC:X CVE-2018-0334 CWE-295 Summary o A vulnerability in the certificate management subsystem of Cisco AnyConnect Network Access Manager and of Cisco AnyConnect Secure Mobility Client for iOS, Mac OS X, Android, Windows, and Linux could allow an unauthenticated, remote attacker to bypass the TLS certificate check when downloading certain configuration files. The vulnerability is due to improper use of Simple Certificate Enrollment Protocol and improper server certificate validation. An attacker could exploit this vulnerability by preparing malicious profile and localization files for Cisco AnyConnect to use. A successful exploit could allow the attacker to remotely change the configuration profile, a certificate, or the localization data used by AnyConnect Secure Mobility Client. 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-20180606-AnyConnect-cert-bypass Affected Products o Vulnerable Products This vulnerability affects Cisco AnyConnect Network Access Manager and Cisco AnyConnect Secure Mobility Client for iOS, Mac OS X, Android, Windows, and Linux. 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 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. Subscribe to Cisco Security Notifications o Subscribe URL o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606-AnyConnect-cert-bypass Revision History o +---------+---------------------------+---------+--------+---------------+ | Version | Description | Section | Status | Date | +---------+---------------------------+---------+--------+---------------+ | 1.0 | Initial public release. | -- | Final | 2018-June-06 | +---------+---------------------------+---------+--------+---------------+ Legal Disclaimer o THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME. A standalone copy or paraphrase of the text of this document that omits the distribution URL is an uncontrolled copy and may lack important information or contain factual errors. The information in this document is intended for end users of Cisco products. - --------------------------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 iQIVAwUBWxioM2aOgq3Tt24GAQjbrhAAyeDJvNuOrlakaFqTTefTOkEnXkhAWggA i8ZoKuGWzZpf6uYrh3lawJBgr7Ja+4k+o47SAQivk79H14Tcg/2iWcBhk9LfIzQd OOAKfhHh8QQdxg7IlIril/DCoQj6p1U/CMWKNGXzo3F2ShnFFgw/2HatxWUpqsax pjjMldhe/QiMFxA5hcDGWXbLBhdCdawUXEBnVvdUvVl3nEdRPMeySgE8A0UbIMUC K9MfgXxrrLnjaq+pgPyWibnPNMTrjRUpUjRvgGRKd3SnFuTgGx1lRKYfn7MVGH+w k58DPe4SUUL1coMovDsyBuXG2QRW0EZmP8sQ0KxPn15u6LeXjFiCDKC3aNe4dFGc elxTahWVhyZAHjrMze18EiPW4tNzCoEhatdPFJfYBJ0zQ+4q4TK4kTkkhdhhRxN+ QZDnFsH73Nb8DBhlkei+Yzw6+UP/uWJ14Ci6DdEYuTSu0ONWS70Yb9q6phZuHllJ GXb+1xxZwYkw2iEyc84v0p5p3zJZk/mMgmSe9hOFxUNfZiArpGEebxeHPW3VU5Mn d5DUCkzZ6706RlaCozDfsHjj2SYuoW67bc0INQVEvWetziq1OZ/KgAmy3UAsVLJg xtPhufQQxTNMBHEsaup7JOoYJHz5qD8KGRUSZbTgft48BCf+NTSm8MsJ57FfZ474 dwGqpDSlR5Q= =rDVB -----END PGP SIGNATURE-----