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AUSCERT External Security Bulletin Redistribution
ESB-2020.3415
USN-4557-1: Tomcat vulnerabilities
1 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tomcat
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Cross-site Scripting -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Unauthorised Access -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-8735 CVE-2016-6816 CVE-2016-6797
CVE-2016-6796 CVE-2016-6794 CVE-2016-5018
CVE-2016-0762
Reference: ESB-2017.1892
ESB-2017.1595
ESB-2017.1560
Original Bulletin:
https://usn.ubuntu.com/4557-1/
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USN-4557-1: Tomcat vulnerabilities
30 September 2020
Several security issues were fixed in Tomcat.
Releases
o Ubuntu 16.04 LTS
Packages
o tomcat6 - Servlet and JSP engine
Details
It was discovered that the Tomcat realm implementations incorrectly handled
passwords when a username didn't exist. A remote attacker could possibly
use this issue to enumerate usernames. (CVE-2016-0762)
Alvaro Munoz and Alexander Mirosh discovered that Tomcat incorrectly
limited use of a certain utility method. A malicious application could
possibly use this to bypass Security Manager restrictions. (CVE-2016-5018)
It was discovered that Tomcat incorrectly controlled reading system
properties. A malicious application could possibly use this to bypass
Security Manager restrictions. (CVE-2016-6794)
It was discovered that Tomcat incorrectly controlled certain configuration
parameters. A malicious application could possibly use this to bypass
Security Manager restrictions. (CVE-2016-6796)
It was discovered that Tomcat incorrectly limited access to global JNDI
resources. A malicious application could use this to access any global JNDI
resource without an explicit ResourceLink. (CVE-2016-6797)
Regis Leroy discovered that Tomcat incorrectly filtered certain invalid
characters from the HTTP request line. A remote attacker could possibly
use this issue to inject data into HTTP responses. (CVE-2016-6816)
Pierre Ernst discovered that the Tomcat JmxRemoteLifecycleListener did not
implement a recommended fix. A remote attacker could possibly use this
issue to execute arbitrary code. (CVE-2016-8735)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 16.04
o libservlet2.5-java - 6.0.45+dfsg-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2016-6797
o CVE-2016-6816
o CVE-2016-6794
o CVE-2016-5018
o CVE-2016-8735
o CVE-2016-6796
o CVE-2016-0762
Related notices
o USN-3177-1 : tomcat8, tomcat7, libtomcat6-java, libtomcat8-java,
libtomcat7-java, tomcat6
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NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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