ESB-2018.0199 - [Win][Linux][OSX] Cisco AnyConnect Secure Mobility Client : Modify arbitrary files - Console/physical 2018-01-18

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0199
Cisco AnyConnect Profile Editor XML External Entity Injection Vulnerability
                              18 January 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Cisco AnyConnect Secure Mobility Client
Publisher:         Cisco Systems
Operating System:  Windows
                   Linux variants
                   OS X
Impact/Access:     Modify Arbitrary Files -- Console/Physical
                   Read-only Data Access  -- Console/Physical
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0100  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-acpe

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Cisco Security Advisory

Cisco AnyConnect Profile Editor XML External Entity Injection Vulnerability

Medium

Advisory ID: cisco-sa-20180117-acpe

First Published: 2018 January 17 16:00 GMT

Version 1.0: Final

Workarounds: No workarounds available

Cisco Bug IDs:

CSCvg19341

CVSS Score:

Base 4.4

Base 4.4 CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N/E:X/RL:X/RC:X

CVE-2018-0100

CWE-611

Summary

A vulnerability in the Profile Editor of the Cisco AnyConnect Secure Mobility
Client could allow an unauthenticated, local attacker to have read and write 
access to information stored in the affected system.

The vulnerability is due to improper handling of the XML External Entity (XXE)
entries when parsing an XML file. An attacker could exploit this vulnerability
by injecting a crafted XML file with malicious entries, which could allow the
attacker to read and write files.

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-20180117-acpe

Affected Products

Vulnerable Products

This vulnerability affects Cisco AnyConnect VPN Client Software. For 
information about affected software releases, consult the Cisco bug ID(s) at 
the top of this advisory.

Products Confirmed Not Vulnerable

No other Cisco products are currently known to be affected by this 
vulnerability.

Workarounds

There are no workarounds that address this vulnerability.

Fixed Software

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

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 Cisco would like to thank Alain Homewood of Insomnia Security for 
reporting this vulnerability.

URL

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-acpe

Revision History

Version Description 		Section Status 	Date

1.0 	Initial public release. 	Final 	2018-January-17

LEGAL DISCLAIMER

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.

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