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AUSCERT External Security Bulletin Redistribution
ESB-2019.1531.2
Cisco Email Security Appliance Filter Bypass Vulnerability
6 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco Email Security Appliance
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1844
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-esa-bypass
Revision History: May 6 2019: Updated Cisco Bug ID
May 3 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Email Security Appliance Filter Bypass Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190501-esa-bypass
First Published: 2019 May 1 16:00 GMT
Last Updated: 2019 May 3 20:26 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvm36810
CVE-2019-1844
CWE-20
CVSS 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 the Cisco
Email Security Appliance (ESA) could allow an unauthenticated, remote
attacker to bypass the filtering functionality of an affected device.
The vulnerability is due to improper detection of certain content sent to
an affected device. An attacker could exploit this vulnerability by sending
certain file types without Content-Disposition information to an affected
device. A successful exploit could allow an attacker to send messages that
contain malicious content to 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-20190501-esa-bypass
Affected Products
o Vulnerable Products
This vulnerability affects the Cisco ESA. For information about affected
software releases, consult the Cisco bug IDs 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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-esa-bypass
Revision History
o +----------+---------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+----------+---------------------------+----------+--------+--------------+
| 1.1 | Updated Cisco Bug ID. | Header | Final | 2019-May-03 |
+----------+---------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-May-01 |
+----------+---------------------------+----------+--------+--------------+
- --------------------------END INCLUDED TEXT--------------------
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