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AA-2009.0146                  AUSCERT Advisory

                             [Win][UNIX/Linux]
        International Components for Unicode: Cross-site Scripting
                               22 June 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              ICU
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Cross-site Scripting
Access:               Remote/Unauthenticated
CVE Names:            CVE-2009-0153
Member content until: Monday, July 20 2009

Ref:                  ESB-2009.0459

OVERVIEW:

       International Components (ICU) for Unicode is vulnerable to a 
       cross-site scripting attack due to improper handling of certain
       character encodings.


IMPACT:

       ICU does not correctly handle invalid byte sequences with certain 
       character encodings during Unicode conversion, effectively violating 
       the fundamental encoding scheme. [1, 2]


MITIGATION:

       It is recommended to update to version 4.0, available from the 
       vendor's website. [3]


REFERENCES:

       [1] conversion: consistent illegal sequences
           http://bugs.icu-project.org/trac/ticket/5691

       [2] CVE-2009-0153
           http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0153

       [3] Download ICU 4.0 release
           http://icu-project.org/download/4.0.html

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.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
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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