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AUSCERT External Security Bulletin Redistribution
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
Impact/Access: Increased Privileges -- Existing Account
CVE Names: CVE-2015-6306
Revision History: October 2 2015: Cisco has released a patch fixing the
September 28 2015: Initial Release
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Cisco AnyConnect Secure Mobility Client for Linux and Mac OS X Privilege
Threat Type: CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID: 41135
First Published: 2015 September 23 16:03 GMT
Last Published: 2015 September 30 12:52 GMT
Port: Not available
Urgency: Unlikely Use
Severity: Moderate Damage
CVSS Base: 6.8
[Updated!] CVSS Temporal: 5.6
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.
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.
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.
Cisco has released bug ID CSCuv11947 for registered users, which contains
additional details and an up-to-date list of affected product versions.
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.
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.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local
Administrators are advised to allow only privileged users to access
administration or management systems.
Administrators are advised to monitor affected systems.
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 email@example.com.
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
The security vulnerability applies to the following combinations of products.
Cisco Cisco AnyConnect Secure Mobility Client 4.1 (8)
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.
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