Apache Tomcat 8.x / 9.x Refactoring Information Disclosure

Published
Credit
Risk
2017.04.11
Tomcat
Low
CWE
CVE
Local
Remote
N/A
CVE-2017-5651
No
Yes

CVSS Base Score
Impact Subscore
Exploitability Subscore
7.5/10
6.4/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial

CVE-2017-5651 Apache Tomcat Information Disclosure

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.0.M18
Apache Tomcat 8.5.0 to 8.5.12
Apache Tomcat 8.0.x and earlier are not affected

Description:
The refactoring of the HTTP connectors for 8.5.x onwards, introduced a
regression in the send file processing. If the send file processing
completed quickly, it was possible for the Processor to be added to the
processor cache twice. This could result in the same Processor being
used for multiple requests which in turn could lead to unexpected errors
and/or response mix-up.

Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 9.0.0.M19 or later
- Upgrade to Apache Tomcat 8.5.13 or later

Credit:
This issue was reported publicly as Bug 60918 [1] and the security
implications identified by the Tomcat security team.

History:
2017-04-10 Original advisory

References:
[1] https://bz.apache.org/bugzilla/show_bug.cgi?id=60918
[2] http://tomcat.apache.org/security-9.html
[3] http://tomcat.apache.org/security-8.html

References:

https://bz.apache.org/bugzilla/show_bug.cgi?id=60918


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