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AUSCERT External Security Bulletin Redistribution
ESB-2018.0196.2
Cisco Email Security and Content Security Management
Appliance Privilege Escalation Vulnerability
24 January 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Email Security and Content Security Management Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Root Compromise -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0095
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180117-esasma
Revision History: January 24 2018: Updated the Fixed Release table.
January 18 2018: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Security Advisory
Cisco Email Security and Content Security Management Appliance Privilege
Escalation Vulnerability
High
Advisory ID:
cisco-sa-20180117-esasma
First Published:
2018 January 17 16:00 GMT
Last Updated:
2018 January 23 16:28 GMT
Version 1.1:
Final
Workarounds:
No workarounds available
Cisco Bug IDs:
CSCvb34303
CSCvb35726
CVE-2018-0095
CWE-264
CVSS Score:
Base 7.8[blue-squar]Click Icon to Copy Verbose Score
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
CVE-2018-0095
CWE-264
Download CVRF
Download PDF
Email
Summary
o A vulnerability in the administrative shell of the Cisco Email Security
Appliance (ESA) and Content Security Management Appliance (SMA) could allow
an authenticated, local attacker to escalate their privilege level and gain
root access. The attacker has to have a valid user credential with at least
a privilege level of a guest user.
The vulnerability is due to an incorrect networking configuration at the
administrative shell CLI. An attacker could exploit this vulnerability by
authenticating to the targeted device and issuing a set of crafted,
malicious commands at the administrative shell. An exploit could allow the
attacker to gain root access on the device.
Cisco has released software updates that address this vulnerability. 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-esasma
Affected Products
o Vulnerable Products
This vulnerability affects all software versions through the first fixed
release of Cisco AsyncOS Software for ESA and Content SMA, for both virtual
and hardware appliances.
Cisco Cloud Email Security (CES) includes the ESA and SMA as part of the
service solution. Cisco provides regular maintenance of the products
included in this solution. Customers can also request a software upgrade by
contacting CES support.
Determining the Software Version
To determine whether a vulnerable version of Cisco AsyncOS Software is
running on a Cisco ESA, administrators can use the version command in the
ESA CLI. The following example shows the results for a device running Cisco
AsyncOS Software version 9.7.2-065:
ciscoesa> version
Current Version
===============
Product: Cisco IronPort X1070 Messaging Gateway(tm) Appliance
Model: X1070
Version: 9.7.2-065
.
.
.
To determine whether a vulnerable version of Cisco AsyncOS Software is
running on a Cisco SMA, administrators can use the version command in the
SMA CLI. The following example shows the results for a device running Cisco
AsyncOS Software version 9.1.1-005:
ciscosma> version
Current Version
===============
Product: Cisco IronPort M670 Security Management(tm) Appliance
Model: M670
Version: 9.1.1-005
.
.
.
Products Confirmed Not Vulnerable
No other Cisco products are currently known to be affected by this
vulnerability.
Cisco has confirmed that this vulnerability does not affect Cisco Web
Security Appliance, virtual and hardware versions.
Workarounds
o There are no workarounds that address this vulnerability.
Fixed Software
o Cisco has released free software updates that address the vulnerability
described in this advisory. Customers may only install and expect support
for software versions and feature sets for which they have purchased a
license. By installing, downloading, accessing, or otherwise using such
software upgrades, customers agree to follow the terms of the Cisco
software license: https://www.cisco.com/c/en/us/products/
end-user-license-agreement.html
Additionally, customers may only download software for which they have a
valid license, procured from Cisco directly, or through a Cisco authorized
reseller or partner. In most cases this will be a maintenance upgrade to
software that was previously purchased. Free security software updates do
not entitle customers to a new software license, additional software
feature sets, or major revision upgrades.
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.
Customers Without Service Contracts
Customers who purchase directly from Cisco but do not hold a Cisco service
contract and customers who make purchases through third-party vendors but
are unsuccessful in obtaining fixed software through their point of sale
should obtain upgrades by contacting the Cisco TAC: https://www.cisco.com/c
/en/us/support/web/tsd-cisco-worldwide-contacts.html
Customers should have the product serial number available and be prepared
to provide the URL of this advisory as evidence of entitlement to a free
upgrade.
Fixed Releases
In the following tables, the left column lists major releases of Cisco
AsyncOS Software for ESA and SMA. The right column indicates whether a
major release is affected by the vulnerability described in this advisory
and the first minor release that includes the fix for this vulnerability.
Customers should upgrade to an appropriate release as indicated in the
following tables:
-----------------------------------------------------------------------
- Cisco AsyncOS ESA Software | First Fixed Release for This -
- Major Release | Vulnerability -
---------------------------------+-------------------------------------
- Prior to 9.8 | Affected; migrate to 9.8.0-015 or -
- | 10.0.1-087 -
---------------------------------+-------------------------------------
- 9.8 | 9.8.0-092 -
---------------------------------+-------------------------------------
- 10.0 | 10.0.1-087 -
---------------------------------+-------------------------------------
- 11.0 | Not vulnerable -
-----------------------------------------------------------------------
-----------------------------------------------------------------------
- Cisco AsyncOS SMA Software | First Fixed Release for This -
- Major Release | Vulnerability -
----------------------------------+------------------------------------
- Prior to 10.1 | Affected; migrate to 11.0.0-115 -
----------------------------------+------------------------------------
- 10.1 | Affected; migrate to 11.0.0-115 -
----------------------------------+------------------------------------
- 10.5 | Affected; migrate to 11.0.0-115 -
----------------------------------+------------------------------------
- 11.0 | 11.0.0-115 -
-----------------------------------------------------------------------
In most cases, administrators can upgrade ESA and SMA software over the
network by doing the following in the Cisco AsyncOS System Administration
GUI:
- Choose System Administration > System Upgrade.
- Click Upgrade Options.
- Click Download.
- Choose the Cisco AsyncOS Software release to upgrade to.
- In the Upgrade Preparation area, choose the appropriate options.
- Click Proceed. A progress bar displays the status of the upgrade.
After the upgrade is complete, the ESA or SMA will reboot.
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 the resolution of a Cisco TAC support
case.
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
Action Links for This Advisory
o Snort Rule 45465
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20180117-esasma
Revision History
+---------+--------------------------+-------------+--------+-----------------+
| Version | Description | Section | Status | Date |
+---------+--------------------------+-------------+--------+-----------------+
| 1.1 | Updated the Fixed | Fixed | Final | 2018-January-23 |
| | Release table. | Software | | |
+---------+--------------------------+-------------+--------+-----------------+
| 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.
- --------------------------END INCLUDED TEXT--------------------
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