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                             CERT-Renater

                 Note d'Information No. 2020/VULN567
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DATE                : 12/10/2020

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Tomcat versions prior to
                              10.0.0-M8, 9.0.38, 8.5.58.

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http://mail-archives.apache.org/mod_mbox/tomcat-announce/202010.mbox/%3c2b767c6e-dcb9-5816-bd69-a3bc0771fef3@apache.org%3e
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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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+ CERT-RENATER       |    tel : 01-53-94-20-44          +
+ 23/25 Rue Daviel   |    fax : 01-53-94-20-41          +
+ 75013 Paris        |    email:cert@support.renater.fr +
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