[Bug network/22334] New: denial of service (out-of-bounds read and crash) via crafted UTF-8 data (CVE-2016-6263)

[dilfridge at gentoo dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=22334

            Bug ID: 22334
           Summary: denial of service (out-of-bounds read and crash) via
                    crafted UTF-8 data (CVE-2016-6263)
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: dilfridge at gentoo dot org
  Target Milestone: ---

The stringprep_utf8_nfkc_normalize function in lib/nfkc.c in libidn before 1.33
allows context-dependent attackers to cause a denial of service (out-of-bounds
read and crash) via crafted UTF-8 data.

This code is still present in its original form in glibc.

CVE:
https://nvd.nist.gov/vuln/detail/CVE-2016-6263

libidn upstream fix:
http://git.savannah.gnu.org/cgit/libidn.git/commit/?id=1fbee57ef3c72db2206dd87e4162108b2f425555

The relevant chunk applies cleanly.

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