ESB-2019.0084 - [OSX] Cisco Jabber for Mac client: Modify arbitrary files - Existing account 2019-01-10

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2019.0084
Cisco Jabber Client Framework Insecure Directory Permissions Vulnerability
                              10 January 2019

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

Product:           Cisco Jabber for Mac client
Publisher:         Cisco Systems
Operating System:  OS X
Impact/Access:     Modify Arbitrary Files -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-0449  

Original Bulletin: 
   https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190109-jabr-mac-permissions

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Cisco Jabber Client Framework Insecure Directory Permissions Vulnerability

Importance:       Medium
Advisory ID:      cisco-sa-20190109-jabr-mac-permissions
First Published:  2019 January 9 16:00 GMT
Version 1.0:      Final
Workarounds:      No workarounds available
Cisco Bug IDs:    CSCvm60187
 
CVE-2018-0449
CWE-275
 
CVSS Score:       Base 5.1
CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H/E:X/RL:X/RC:X

Summary

  o 
    A vulnerability in the Cisco Jabber Client Framework (JCF) software,
    installed as part of the Cisco Jabber for Mac client, could allow an
    authenticated, local attacker to corrupt arbitrary files on an affected
    device that has elevated privileges.

    The vulnerability exists due to insecure directory permissions set on a JCF
    created directory. An authenticated attacker with the ability to access an
    affected directory could create a hard link to an arbitrary location on the
    affected system. An attacker could convince another user that has
    administrative privileges to perform an install or update the Cisco Jabber
    for Mac client to perform such actions, allowing files to be created in an
    arbitrary location on the disk or an arbitrary file to be corrupted when it
    is appended to or overwritten.

    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-20190109-jabr-mac-permissions

Affected Products

  o Vulnerable Products

    This vulnerability affects Cisco Jabber Client for Mac OS. 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 Cisco would like to thank Drew Yao of Apple's Red Team for reporting this
    vulnerability.

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.

URL

  o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
    cisco-sa-20190109-jabr-mac-permissions

Revision History

  o 
    +----------+---------------------------+----------+--------+------------------+
    | Version  |        Description        | Section  | Status |       Date       |
    +----------+---------------------------+----------+--------+------------------+
    | 1.0      | Initial public release.   | --       | Final  | 2019-January-09  |
    +----------+---------------------------+----------+--------+------------------+

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