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AUSCERT External Security Bulletin Redistribution
ESB-2018.2374
Cisco Email Security Appliance EXE File Scanning Bypass Vulnerability
16 August 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Email Security Appliances (ESA)
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2018-0419
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180815-esa-file-bypass
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Cisco Email Security Appliance EXE File Scanning Bypass Vulnerability
Medium
Advisory ID: cisco-sa-20180815-esa-file-bypass
First Published: 2018 August 15 16:00 GMT
Version 1.0: Final
Workarounds: No workarounds available
Cisco Bug IDs:
CVE-2018-0419
CWE-20
CVSSÂ Score:
5.3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:X/RC:X
Summary
o A vulnerability in certain attachment detection mechanisms of Cisco Email
Security Appliances (ESA) could allow an unauthenticated, remote attacker
to bypass the filtering functionality of an affected system.
The vulnerability is due to the improper detection of content within
executable (EXE) files. An attacker could exploit this vulnerability by
sending a customized EXE file that is not recognized and blocked by the
ESA. A successful exploit could allow an attacker to send email messages
that contain malicious executable files to unsuspecting users.
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-20180815-esa-file-bypass
Affected Products
o Vulnerable Products
This vulnerability affects Cisco Email Security Appliance (ESA). 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-20180815-esa-file-bypass
Revision History
o +----------+---------------------------+----------+--------+-----------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+-----------------+
| 1.0 | Initial public release. | - | Final | 2018-August-15 |
+----------+---------------------------+----------+--------+-----------------+
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