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AUSCERT External Security Bulletin Redistribution
ESB-2019.2992.2
Cisco Email Security Appliance Header Injection Vulnerability
1 October 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-2019-1955
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190807-esm-inject
Revision History: October 1 2019: Updated vulnerable product information
August 8 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco Email Security Appliance Header Injection Vulnerability
Priority: Medium
Advisory ID: cisco-sa-20190807-esm-inject
First Published: 2019 August 7 16:00 GMT
Last Updated: 2019 September 26 20:01 GMT
Version 1.1: Final
Workarounds: No workarounds availableCisco Bug IDs: CSCvp27126
CVE-2019-1955
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 the Sender Policy Framework (SPF) functionality of Cisco
AsyncOS Software for Cisco Email Security Appliances (ESA) could allow an
unauthenticated, remote attacker to bypass configured user filters on the
device.
The vulnerability is due to incomplete input and validation checking
mechanisms for certain SPF messages that are sent to an affected device. An
attacker could exploit this vulnerability by sending a customized SPF
packet to an affected device. A successful exploit could allow the attacker
to bypass the header filters that are configured for the affected device,
which could allow malicious content to pass through the device.
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-20190807-esm-inject
Affected Products
o Vulnerable Products
At the time of publication, this vulnerability affected Cisco AsyncOS
Software for Cisco ESA releases earlier than Release 13.0.
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 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.
Fixed Releases
See the Details section in the bug ID(s) at the top of this advisory for
the most complete and current information.
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 Marcel Maeder of Netcloud AG 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-20190807-esm-inject
Revision History
o +---------+----------------------+-----------+--------+-------------------+
| Version | Description | Section | Status | Date |
+---------+----------------------+-----------+--------+-------------------+
| 1.1 | Updated vulnerable | Affected | Final | 2019-September-26 |
| | product information. | Products | | |
+---------+----------------------+-----------+--------+-------------------+
| 1.0 | Initial public | - | Final | 2019-August-07 |
| | release. | | | |
+---------+----------------------+-----------+--------+-------------------+
- --------------------------END INCLUDED TEXT--------------------
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