Hi. I've tried to address the invalid UTF-8 issue when using libidn: http://git.savannah.gnu.org/gitweb/?p=libidn.git;a=commitdiff;h=2e97c2796581c27213962c77f5a8571a598f9a2e
Your thoughts and comments on this is appreciated. Testing whether this actually solves your problem is encouraged. Please read the NEWS blurb for background: ** libidn: stringprep_utf8_to_ucs4 now rejects invalid UTF-8. CVE-2015-2059 This function has always been documented to not validate that the input UTF-8 string is actually valid UTF-8. Like the rest of the API, when you call a function that works on UTF-8 data, you have to pass it valid UTF-8 data. Application writers appear to have difficulties using interfaces designed like that, as bugs triggered by invalid UTF-8 has been identified in a number of projects (jabberd2, gnutls, wget, and curl). While we could introduce a new API to perform UTF-8 validation, so that applications can easily implement the proper checks, this appear error prone because there is a risk that the check will be forgotten. Instead, we took the more radical approach of modifying the documentation and the implementation of the API. The intention is that all functions that accepts UTF-8 data should validate it before use. This will solve the problem for applications, without needing to change them. This change has the unfortunate side-effect that Surrogate codes (see section 5.5 of RFC 3454) no longer trigger the STRINGPREP_CONTAINS_PROHIBITED error code but instead will trigger the newly introduced STRINGPREP_ICONV_ERROR error code, as the gnulib/libunistring-based code that we use to test UTF-8-compliance rejects Surrogate codes. We hope that this is an acceptable cost to live with in order to improve application security. We welcome feedback on this solution, and we are marking this release as beta rather than stable to signal that we may reconsider this approach if people disagree. Reported by several people including Thijs Alkemade, Gustavo Grieco, Daniel Stenberg, and Nikos Mavrogiannopoulos. /Simon
signature.asc
Description: PGP signature
_______________________________________________ Help-libidn mailing list Help-libidn@gnu.org https://lists.gnu.org/mailman/listinfo/help-libidn
