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AUSCERT External Security Bulletin Redistribution
ESB-2019.2546.2
Cisco ASA and FTD Software Cryptographic TLS and SSL Driver
Denial of Service Vulnerability
12 July 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Cisco ASA Software
Cisco FTD Software
Publisher: Cisco Systems
Operating System: Cisco
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-1873
Original Bulletin:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710-asa-ftd-dos
Revision History: July 12 2019: Vendor added hotfix details to the
Fixed Software section
July 11 2019: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service
Vulnerability
Priority: High
Advisory ID: cisco-sa-20190710-asa-ftd-dos
First Published: 2019 July 10 16:00 GMT
Last Updated: 2019 July 11 21:11 GMT
Version 1.1: Final
Workarounds: No workarounds available
Cisco Bug IDs: CSCvp36425
CVE-2019-1873
CWE-400
CVSS Score:
8.6 AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X
Summary
o
A vulnerability in the cryptographic driver for Cisco Adaptive Security
Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could
allow an unauthenticated, remote attacker to cause the device to reboot
unexpectedly.
The vulnerability is due to incomplete input validation of a Secure Sockets
Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An
attacker could exploit this vulnerability by sending a crafted TLS/SSL
packet to an interface on the targeted device. An exploit could allow the
attacker to cause the device to reload, which will result in a denial of
service (DoS) condition.
Note: Only traffic directed to the affected system can be used to exploit
this vulnerability. This vulnerability affects systems configured in routed
and transparent firewall mode and in single or multiple context mode. This
vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS
session is required to exploit this vulnerability.
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-20190710-asa-ftd-dos
Affected Products
o
Vulnerable Products
This vulnerability affects the following Cisco products if they are running
a vulnerable release of Cisco ASA Software or FTD Software:
ASA 5506-X
ASA 5506-X with FirePOWER Services
ASA 5506H-X
ASA 5506H-X with FirePOWER Services
ASA 5506W-X
ASA 5506W-X with FirePOWER Services
ASA 5508-X
ASA 5508-X with FirePOWER Services
ASA 5516-X
ASA 5516-X with FirePOWER Services
This vulnerability applies only to the ASA hardware platforms that use a
specific cryptographic driver for SSL and TLS packet decryption and
encryption. There are multiple features that, when enabled, cause Cisco ASA
Software or FTD Software to process SSL/TLS packets. These features
include, but are not limited to, the following:
AnyConnect and Clientless SSL VPN
HTTP server used for the management interface
To verify whether a device running Cisco ASA Software or FTD Software could
process SSL or TLS packets, use the show asp table socket | include SSL|
DTLS command and verify that it returns output. When this command returns
any output, the device is vulnerable. When this command returns empty
output, the device is not vulnerable. The following example shows the
output of the show asp table socket | include SSL|DTLS command from a
device that is vulnerable:
BSNS-ASA5505-4# show asp table socket | include SSL|DTLS
SSL 0005aa68 LISTEN x.x.x.x:443 0.0.0.0:*
SSL 002d9e38 LISTEN x.x.x.x:8443 0.0.0.0:*
DTLS 0018f7a8 LISTEN 10.0.0.250:443 0.0.0.0:*
Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory
are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following
Cisco products:
3000 Series Industrial Security Appliances (ISAs)
7600 Series ASA Services Module
Adaptive Security Virtual Appliance (ASAv)
ASA 1000V Cloud Firewall
ASA 5505 Adaptive Security Appliance
ASA 5510 Adaptive Security Appliance
ASA 5512-X Adaptive Security Appliance
ASA 5515-X Adaptive Security Appliance
ASA 5520 Adaptive Security Appliance
ASA 5525-X Adaptive Security Appliance
ASA 5540 Adaptive Security Appliance
ASA 5545-X Adaptive Security Appliance
ASA 5550 Adaptive Security Appliance
ASA 5555-X Adaptive Security Appliance
ASA 5580 Adaptive Security Appliance
ASA 5585-X Adaptive Security Appliance
ASA 5512-X with FirePOWER Services
ASA 5515-X with FirePOWER Services
ASA 5525-X with FirePOWER Services
ASA 5545-X with FirePOWER Services
ASA 5555-X with FirePOWER Services
ASA 5585-X with FirePOWER SSP-10, SSP-20, SSP-40, or SSP-60
Catalyst 6500 Series ASA Services Module
Firepower 2100 Series
Firepower 4100 Series
FirePOWER 7000 Series Appliances
FirePOWER 8000 Series Appliances
Firepower 9300 Security Appliances
Firepower Threat Defense Virtual (FTDv)
Industrial Security Appliance 3000
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
Customers are advised to upgrade to an appropriate release as indicated in
the applicable table in this section. In the following table(s), the left
column lists Cisco software releases and the right column indicates whether
a release is affected by the vulnerability described in this advisory and
the release that includes the fix for this vulnerability
Cisco ASA Software
Cisco ASA Software Release First Fixed Release for This Vulnerability
Prior to 9.4 ^1 9.4.4.36
9.4 9.4.4.36
9.5 ^1 9.6.4.29
9.6 9.6.4.29
9.7 ^1 9.8.4.3
9.8 9.8.4.3
9.9 9.9.2.52
9.10 9.10.1.22
9.12 9.12.2
^ 1 Cisco ASA Software releases prior to Release 9.4 and Cisco ASA Software
Releases 9.5 and 9.7 have reached end of maintenance. Customers should
migrate to a supported release that includes the fix for this
vulnerability.
Cisco FTD Software
Cisco FTD Software First Fixed Release for This Vulnerability
Release
6.0 ^1 6.2.3.13
6.0.1 ^1 6.2.3.13
6.1.0 6.2.3.13
6.2.0 6.2.3.13
6.2.1 6.2.3.13
6.2.2 6.2.3.13
6.2.3 6.2.3.13
6.3.0 Cisco_FTD_Hotfix_AA-6.3.0.4-2 or 6.3.0.4 (August
2019)
6.4.0 6.4.0.2
^ 1 Cisco FTD Software releases prior to and including Release 6.0.1 have
reached end of maintenance. Customers should migrate to a supported release
that includes the fix for this vulnerability.
To upgrade to a fixed release of Cisco FTD Software, customers can do one
of the following:
For devices that are managed by using Cisco Firepower Management Center
(FMC), use the FMC interface to install the upgrade. After installation
is complete, reapply the access control policy.
For devices that are managed by using Cisco Firepower Device Manager
(FDM), use the FDM interface to install the upgrade. After installation
is complete, reapply the access control policy.
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.
URL
o https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/
cisco-sa-20190710-asa-ftd-dos
Revision History
o +---------+----------------------------+----------+--------+--------------+
| Version | Description | Section | Status | Date |
+---------+----------------------------+----------+--------+--------------+
| | Added the hotfix | Fixed | | |
| 1.1 | information for the FTD | Software | Final | 2019-July-11 |
| | 6.3.0 release. | | | |
+---------+----------------------------+----------+--------+--------------+
| 1.0 | Initial public release. | - | Final | 2019-July-10 |
+---------+----------------------------+----------+--------+--------------+
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