Cisco Security Advisory
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AV:N/AC:M/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C
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A vulnerability in the connection establishment process of Cisco AnyConnect Secure Mobility Client could allow an unauthenticated, remote attacker to write or overwrite files in the active user's context.
The vulnerability is due to insufficient input validation. An unauthenticated, remote attacker could exploit this vulnerability by persuading a user to connect to a malicious head-end system. The malicious head-end system could be used to pass back crafted configuration attributes, which the attacker could leverage to execute a directory traversal attack. A successful exploit could allow the attacker to write or overwrite any file in the active user's context. The location or file must be writable by the user running the AnyConnect client.
Cisco has confirmed the vulnerability and released software updates.
To exploit this vulnerability, an attacker would need to convince a targeted user to connect to a malicious head-end system. The attacker may use misleading language and instructions or other social engineering techniques to trick users.
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Cisco has released bug ID CSCut93920 for registered users, which contains additional details and an up-to-date list of affected product versions.
Vulnerable Products
At the time this alert was first published, Cisco AnyConnect Secure Mobility Client release 4.0(2049) was vulnerable. Later releases of Cisco AnyConnect Secure Mobility Client may also be vulnerable.Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by these vulnerabilities.
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Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to have network access.
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.
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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.
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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.
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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.
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Show LessVersion Description Section Status Date 1.0 Cisco AnyConnect Secure Mobilty Client contains a vulnerability that could allow an unauthenticated, remote attacker to conduct directory traversal attacks. Updates are available. NA Final 2015-Jul-30
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