ESB-2018.1690 - [Win][Linux][Apple iOS][Android][Mac] Cisco AnyConnect Secure Mobility Client: Modify arbitrary files - Remote/unauthenticated 2018-06-07

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.1690
 Cisco AnyConnect Secure Mobility Client Certificate Bypass Vulnerability
                                7 June 2018

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        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

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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.

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