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AUSCERT External Security Bulletin Redistribution
ESB-2020.3506
CVE-2020-13943 Apache Tomcat HTTP/2 Request mix-up
13 October 2020
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AusCERT Security Bulletin Summary
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Product: Apache Tomcat
Publisher: Apache
Operating System: UNIX variants (UNIX, Linux, OSX)
Windows
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-13943
Original Bulletin:
https://www.mail-archive.com/announce@tomcat.apache.org/msg00433.html
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CVE-2020-13943 Apache Tomcat HTTP/2 Request mix-up
Severity: Moderate
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.0-M7
Apache Tomcat 9.0.0.M5 to 9.0.37
Apache Tomcat 8.5.1 to 8.5.57
Description:
If an HTTP/2 client exceeded the agreed maximum number of concurrent
streams for a connection (in violation of the HTTP/2 protocol), it was
possible that a subsequent request made on that connection could contain
HTTP headers - including HTTP/2 pseudo headers - from a previous request
rather than the intended headers. This could lead to users seeing
responses for unexpected resources.
Mitigation:
- - Upgrade to Apache Tomcat 10.0.0-M8 or later
- - Upgrade to Apache Tomcat 9.0.38 or later
- - Upgrade to Apache Tomcat 8.5.58 or later
Credit:
This issue was identified by the Apache Tomcat Security Team.
References:
[1] http://tomcat.apache.org/security-10.html
[2] http://tomcat.apache.org/security-9.html
[3] http://tomcat.apache.org/security-8.html
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The University of Queensland
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