Summary
Reference
SUPPORT COMMUNICATION - SECURITY BULLETIN
Potential Security Impact: File content disclosure / remote code execution in Apache Tomcat
VULNERABILITY SUMMARY
A vulnerability in Apache Tomcat was addressed by Network Automation. The vulnerability could be exploited to file content disclosure of the web application or remote code execution.
When using the Apache JServ Protocol (AJP), care must be taken when trusting incoming connections to Apache Tomcat. Tomcat treats AJP connections as having higher trust than, for example, a similar HTTP connection. If such connections are available to an attacker, they can be exploited in ways that may be surprising. In Apache Tomcat 9.0.0.M1 to 9.0.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99, Tomcat shipped with an AJP Connector enabled by default that listened on all configured IP addresses. It was expected (and recommended in the security guide) that this Connector would be disabled if not required. This vulnerability report identified a mechanism that allowed: - returning arbitrary files from anywhere in the web application - processing any file in the web application as a JSP Further, if the web application allowed file upload and stored those files within the web application (or the attacker was able to control the content of the web application by some other means) then this, along with the ability to process a file as a JSP, made remote code execution possible. It is important to note that mitigation is only required if an AJP port is accessible to untrusted users. Users wishing to take a defense-in-depth approach and block the vector that permits returning arbitrary files and execution as JSP may upgrade to Apache Tomcat 9.0.31, 8.5.51 or 7.0.100 or later. A number of changes were made to the default AJP Connector configuration in 9.0.31 to harden the default configuration. It is likely that users upgrading to 9.0.31, 8.5.51 or 7.0.100 or later will need to make small changes to their configurations.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1938
CVE References:
CVE-2020-1938
SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
Network Automation Affected Versions:
9.2x, 10.0x, 10.1x, 10.2x, 10.3x, 10.4x, 10.5x, 2018.05, 2018.08, 2018.11,2019.05.
Only the environments that have deployed Network Automation Gateway/Satellite component are impacted.
CVSS Version 3.0 and Version 2.0 Base Metrics
|
Reference |
V3 Vector |
V3 Base Score |
V2 Vector |
V2 Base Score |
|---|---|---|---|---|
|
CVE-2020-1938 |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
9.8 |
(AV:N/AC:L/Au:N/C:P/I:P/A:P) |
7.5 |
RESOLUTION
Micro Focus has made the following mitigation information available to resolve the vulnerability for the impacted versions of Network Automation:
To check if you have deployed NA Gateway/Satellite Remote Agents:
You can find list of Remote Gateways by Logging into the NA Web UI and going to Menu:
Admin -> Gateways.
If you get a message “There is no Gateway Mesh configured.” then you are not affected.
If you get a table with Gateway list, if you find any row with the Agent column filled in, then you are affected.
If you have deployed Network Automation Satellite:
1. On each Remote Gateway server, login to the machine.
o You can find list of Remote Gateways by Logging into the NA Web UI and going to Menu:
Admin -> Gateways.
Machines with “Agent” column value filled in, are Remote Gateways with NA Satellite Remote Agent installed.
2. Stop the NA Satellite Remote Agent Component using:
/etc/init.d/nassat stop
3. Take a backup of the file: /opt/opsware/nassat/server/ext/tomcat/conf/server.xml to a location outside the /opt/ directory structure.
4. Open the File /opt/opsware/nassat/server/ext/tomcat/conf/server.xml
And DELETE the following two lines:
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
5. Restart the NA Satellite Remote Agent Component using:
/etc/init.d/nassat start
Note: If you redeploy the NA Satellite Remote Agent on affected versions of NA, you will need to redo the steps 1-5.
Note: Please ignore the following message you might get when stopping NA Satellite Remote Agent:
rm: cannot remove ‘/var/run/catalina.pid’: No such file or directory
You can alternatively mitigate this issue if you upgrade to an unaffected version.
Network Automation Versions that are unaffected:
2020.02
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