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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2015.2507.2 Cisco AnyConnect Secure Mobility Client for Linux and Mac OS X Privilege Escalation Vulnerability 2 October 2015 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Cisco AnyConnect Secure Mobility Client Publisher: Cisco Systems Operating System: Linux variants OS X Impact/Access: Increased Privileges -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2015-6306 Original Bulletin: http://tools.cisco.com/security/center/viewAlert.x?alertId=41135 Revision History: October 2 2015: Cisco has released a patch fixing the CVE September 28 2015: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Alert Cisco AnyConnect Secure Mobility Client for Linux and Mac OS X Privilege Escalation Vulnerability Threat Type: CWE-264: Permissions, Privileges, and Access Control IntelliShield ID: 41135 Version: 2 First Published: 2015 September 23 16:03 GMT Last Published: 2015 September 30 12:52 GMT Port: Not available CVE: CVE-2015-6306 Urgency: Unlikely Use Credibility: Confirmed Severity: Moderate Damage CVSS Base: 6.8 [Updated!] CVSS Temporal: 5.6 Version Summary: IntelliShield has updated this alert to notify customers on the availability of software updates to address the Cisco AnyConnect Secure Mobility Client for Linux and Mac OS X privilege escalation vulnerability. [Updated!] Description A vulnerability in the code responsible for the self-updating feature of Cisco AnyConnect Secure Mobility Client for Linux and the Cisco AnyConnect Secure Mobility Client for Mac OS X could allow an authenticated, local attacker to execute an arbitrary executable file of its choosing with privileges equivalent to the Linux or Mac OS X root account. The vulnerability is due to lack of checks in the code for the path and filename of the file being installed. An attacker could exploit this vulnerability by invoking this functionality with a crafted installation file. A successful exploit could allow the attacker to execute commands on the underlying Linux or Mac OS X host with privileges equivalent to the root account. Cisco has confirmed the vulnerability and software updates are available. Warning Indicators At the time this alert was first published, Cisco AnyConnect Secure Mobility Client version 4.1(8) was vulnerable. Other versions of Cisco AnyConnect Secure Mobility Client may also be affected. [Updated!] IntelliShield Analysis To exploit this vulnerability, an attacker must authenticate and have local access to the targeted device. These access requirements decrease the likelihood of a successful exploit. This vulnerability can be exploited only on systems running on Linux and Mac OS platforms. Systems on Microsoft Windows platforms are not affected by this vulnerability. Cisco indicates through the CVSS score that functional code exists; however, the code is not known to be publicly available. This issue was reported to the Cisco PSIRT by Mr. Yorick Koster of Securify B.V. We would like to thank Mr. Koster and Securify B.V. for reporting this vulnerability to Cisco and working with us towards a coordinated disclosure. Vendor Announcements Cisco has released bug ID CSCuv11947 for registered users, which contains additional details and an up-to-date list of affected product versions. Impact An authenticated, local attacker could exploit this vulnerability to gain elevated privileges on an affected device. A successful exploit could result in a complete system compromise. Technical Information The vulnerability is due to improper validation of the code associated with the path and filename of the file being installed on the targeted device. An attacker could exploit this vulnerability by sending a specially crafted installation file to the affected device. A successful exploit could allow the attacker to execute commands on the underlying Linux or Mac OS X host with privileges equivalent to the root account. [Updated!] Safeguards Administrators are advised to apply the appropriate updates. Administrators are advised to allow only trusted users to access local systems. Administrators are advised to allow only privileged users to access administration or management systems. Administrators are advised to monitor affected systems. [Updated!] 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 Version 1, September 23, 2015, 12:03 PM: Cisco AnyConnect Secure Mobility Client contains a vulnerability that could allow an authenticated, local attacker to elevate privileges on a targeted account. Updates are not available. Product Sets The security vulnerability applies to the following combinations of products. Primary Products: Cisco Cisco AnyConnect Secure Mobility Client 4.1 (8) 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. 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: 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 iQIVAwUBVg27vX6ZAP0PgtI9AQLvpg//ZpdOp/1ijJT+iIGQiPKk51+TGg0y1SMf i/mbER6slamH4SbtrZu38To3Ycd5XvlkouKiAa3bBzPvwfSW7ltfC4HlHfy8Kjfy dv05h5+qA5Pp0/94A/WTKtdP/8JQgUTdZaaTJnc89qv+ryOwauQ7hDSw4ItdQFCJ kSji5TovJ50WXyLK2KsMlqRa4PeT9fRRD8o930BK6VlsOZjzSAbXA5ttdn44eVa9 j3Pygi9yHhaASashJIEJnYneaB8dmgw5naO8DtH0SGZYz0zxLWBR4O9Dt4z//Os4 LiKM9la3kksXu2eIEn/Xk1MdzM6jACMyNj2ISEhi8AXatgY/RT3FrxfVcUXwMgS7 vFuM/DHDUjRCIkBU9nhp3iLErLxRGNv9qhV01aHxoOJuNFMiEp3qvrOSqVCjgwU8 JZTrueLGlbjYzMSioJ+y/a3u6+JOrwWRHr/0ItTfJW/e6dPNKFDHJLZgakKhf5lg mILCGug2JbQ5xL6xl5IzhhOxK683cBYlm23jlhi9rIG4tPksHP/P+g6t3SymBm1s 9GSlD/0Z0Up+1BmXLAa3XA2j3+E8B4QjuGc8Wf436dWCClg+UCSnqOX3o6IfC/mB 5D7VXBxR7APRDogss94DoSO5MbMLn16cIyF2BR1iQfTTP/0uI/LAefuapMrZdpaO J2TEt7TpOaQ= =suOd -----END PGP SIGNATURE-----