[cabfpub] ICU library patch for Unicode spoof checks

Hill, Brad bhill at paypal-inc.com
Thu Mar 28 16:09:58 UTC 2013

Download v. 51.1 at:


Binary distributions are available for many platforms.

C API documentation is at: http://icu-project.org/apiref/icu4c/
Java API documentation at: http://icu-project.org/apiref/icu4j/

Just do a search for "Spoof"


From: Rick Andrews [mailto:Rick_Andrews at symantec.com]
Sent: Wednesday, March 27, 2013 6:01 PM
To: Hill, Brad; public at cabforum.org
Subject: RE: ICU library patch for Unicode spoof checks


I believe the competing patch is this one: http://bugs.icu-project.org/trac/ticket/9440

Can you point me toward info on how to checkout and build the library, and where SpoofChecker is documented?


From: public-bounces at cabforum.org<mailto:public-bounces at cabforum.org> [mailto:public-bounces at cabforum.org] On Behalf Of Hill, Brad
Sent: Thursday, March 07, 2013 9:09 AM
To: public at cabforum.org<mailto:public at cabforum.org>
Subject: [cabfpub] ICU library patch for Unicode spoof checks

Should be available in v51.1, http://bugs.icu-project.org/trac/milestone/51.1%20(release)


They accepted a "competing" patch submitted by Google as theirs also included C++ code, but theirs didn't include the bidirectional text requirement.

That is extremely simple to implement by simply forbidding the following code points (punycode encoded or native) in hostnames:

LRE:  U+202A
RLE:  U+202B
PDF: U+202C
LRO: U+202D
RLO: U+202E

Brad Hill
Ecosystem Security
PayPal Information Risk Management
cell: 206.245.7844
skype/twitter: hillbrad
email: bhill at paypal-inc.com<mailto:bhill at paypal-inc.com>

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