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AUSCERT Security Bulletin
ASB-2018.0276
A vulnerability has been identified in Apache Tomcat's JK ISAPI Connector
1 November 2018
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AusCERT Security Bulletin Summary
---------------------------------
Product: Apache Tomcat
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2018-11759
Member content until: Saturday, December 1 2018
OVERVIEW
A vulnerability has been identified in Apache Tomcat JK ISAPI
Connector prior to version 1.2.46. [1]
IMPACT
Apache have provided the following details regarding the
vulnerability:
"Important: Information disclosure CVE-2018-11759
The Apache Web Server (httpd) specific code that normalised the
requested path before matching it to the URI-worker map did not
handle some edge cases correctly. If only a sub-set of the URLs
supported by Tomcat were exposed via httpd, then it was possible for
a specially constructed request to expose application functionality
through the reverse proxy that was not intended for clients
accessing the application via the reverse proxy. It was also
possible in some configurations for a specially constructed request
to bypass the access controls configured in httpd. While there is
some overlap between this issue and CVE-2018-1323, they are not
identical." [1]
MITIGATION
Apache have provided the following mitigation advise:
"Users of affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat JK ISAPI Connector 1.2.46 or later.
- Use alternative measures (e.g. the remote address filter) to
restrictaccess to trusted users. [1]
REFERENCES
[1] Fixed in Apache Tomcat JK Connector 1.2.46
http://tomcat.apache.org/security-jk.html#Fixed_in_Apache_Tomcat_JK_Connector_1.2.46
AusCERT has made every effort to ensure that the information contained
in this document is accurate. However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.
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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
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