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Mageia: 2019-0260 Moderate: Tomcat Update Addresses DoS and XSS

mageia
Calendar Grey September 8, 2019
Dist Mageia Esm H88
Recently released tomcat updates resolve security vulnerabilities, tackling potential DoS threats and XSS flaws within Mageia operating systems.
Updated tomcat packages fix security vulnerabilities: The HTTP/2 implementation accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep strea...

Summary

Updated tomcat packages fix security vulnerabilities:
The HTTP/2 implementation accepted streams with excessive numbers of SETTINGS frames and also permitted clients to keep streams open without reading/writing request/response data. By keeping streams open for requests that utilised the Servlet API's blocking I/O, clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS (CVE-2019-0199).
The SSI printenv command echoes user provided data without escaping and is, therefore, vulnerable to XSS. SSI is disabled by default. The printenv command is intended for debugging and is unlikely to be present in a production website (CVE-2019-0221).
The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write. By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS (CVE-2019-10072).
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Read the Full Advisory

References

- https://bugs.mageia.org/show_bug.cgi?id=24799

- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.16

- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.19

- https://tomcat.apache.org/security-9.html#Fixed_in_Apache_Tomcat_9.0.20

- https://tomcat.apache.org/native-doc/miscellaneous/changelog.html

- https://www.cve.org/CVERecord?id=CVE-2019-0199

- https://www.cve.org/CVERecord?id=CVE-2019-0221

- https://www.cve.org/CVERecord?id=CVE-2019-10072

Topics%20covered

Topics Covered

security advisory update XSS DoS tomcat Mageia HTTP/2

Resolution

SRPMS

- 7/core/tomcat-9.0.21-1.mga7

- 7/core/tomcat-native-1.2.23-1.mga7

Publication date: 08 Sep 2019
URL: https://advisories.mageia.org/MGASA-2019-0260.html
Type: security
CVE: CVE-2019-0199, CVE-2019-0221, CVE-2019-10072

Topics%20covered

Topics Covered

security advisory update XSS DoS tomcat Mageia HTTP/2

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