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AUSCERT External Security Bulletin Redistribution
ESB-2020.3628
USN-4596-1: Tomcat vulnerabilities
22 October 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: Tomcat
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-13935 CVE-2020-13934 CVE-2020-11996
CVE-2020-9484
Reference: ASB-2020.0176
ESB-2020.3547
ESB-2020.3485
ESB-2020.3374
ESB-2020.3254
Original Bulletin:
https://usn.ubuntu.com/4596-1/
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USN-4596-1: Tomcat vulnerabilities
21 October 2020
Several security issues were fixed in Tomcat.
Releases
o Ubuntu 20.04 LTS
Packages
o tomcat9 - Apache Tomcat 9 - Servlet and JSP engine
Details
It was discovered that Tomcat did not properly manage HTTP/2 streams. An
attacker could possibly use this to cause Tomcat to consume resources,
resulting in a denial of service. (CVE-2020-11996)
It was discovered that Tomcat did not properly release the HTTP/1.1
processor after the upgrade to HTTP/2. An attacker could possibly use this
to generate an OutOfMemoryException, resulting in a denial of service.
(CVE-2020-13934)
It was discovered that Tomcat did not properly validate the payload length
in a WebSocket frame. An attacker could possibly use this to trigger an
infinite loop, resulting in a denial of service. (CVE-2020-13935)
It was discovered that Tomcat did not properly deserialize untrusted data.
An attacker could possibly use this issue to execute arbitrary code.
(CVE-2020-9484)
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 20.04
o libtomcat9-embed-java - 9.0.31-1ubuntu0.1
o libtomcat9-java - 9.0.31-1ubuntu0.1
o tomcat9 - 9.0.31-1ubuntu0.1
o tomcat9-common - 9.0.31-1ubuntu0.1
In general, a standard system update will make all the necessary changes.
References
o CVE-2020-9484
o CVE-2020-13934
o CVE-2020-11996
o CVE-2020-13935
Related notices
o USN-4448-1 : libtomcat8-java, tomcat8
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