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AUSCERT External Security Bulletin Redistribution
ESB-2019.1688
Buffer Overflow Vulnerability in Citrix ADC and Citrix NetScaler Gateway
14 May 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix ADC
Citrix NetScaler Gateway
Publisher: Citrix
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-12044
Original Bulletin:
https://support.citrix.com/article/CTX249976
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Buffer Overflow Vulnerability in Citrix ADC and Citrix NetScaler Gateway
Reference: CTX249976
Category : Medium
Created : 13 May 2019
Modified : 13 May 2019
Applicable Products
o Citrix ADC
o NetScaler Gateway
Description of Problem
A buffer overflow vulnerability has been identified in Citrix ADC and Citrix
NetScaler Gateway which could possibly result in a denial-of-service in a
specific configuration.
This vulnerability has been assigned the following CVE number:
o CVE-2019-12044: Buffer overflow vulnerability in Citrix ADC and Citrix
NetScaler Gateway
This vulnerability is present in the following versions of Citrix ADC and
Citrix NetScaler Gateway:
10.5.x earlier than version 10.5.70
11.1.x earlier than version 11.1.59.10
12.0.x earlier than version 12.0.59.8
12.1.x earlier than version 12.1.49.23
Mitigating Factors
The vulnerability can be mitigated by ensuring that virtual servers stay in the
up state, or by disabling URL redirection. Removal of the redirect URL from the
load balancer configuration mitigates this issue. In situations where failover
is still needed for a down load balancer, ensure that the redirect URL contains
at least a domain name ending with a /.
How to Configure Redirect URL on NetScaler Virtual Server When Virtual Server
is Not Available- https://support.citrix.com/article/CTX108946
What Customers Should Do
This vulnerability has been addressed in new versions of the Citrix ADC and
Citrix NetScaler Gateway software. Citrix recommends that customers upgrade
their Citrix ADC and Citrix NetScaler Gateway appliances to one of the
following versions:
11.1.59.10 and later
12.0.59.8 and later
12.1.49.23 and later
These upgrades can be obtained from the Citrix website at the following
locations:
Citrix ADC :
https://www.citrix.com/downloads/citrix-adc/
Citrix NetScaler Gateway:
https://www.citrix.com/downloads/citrix-gateway/product-software.html
The 10.5.70.x version is expected to release in the near future, until released
it is recommended to apply the configuration mitigation or upgrade to a fixed
version.
Changelog
+-------------------------------+---------------------------------------------+
|Date |Change |
+-------------------------------+---------------------------------------------+
|13th May 2019 |Initial publication |
+-------------------------------+---------------------------------------------+
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