[Bug 193355] New: OPIE may not generate passwds from the dictionary correctly

bugzilla-noreply at freebsd.org bugzilla-noreply at freebsd.org
Fri Sep 5 23:18:00 UTC 2014


            Bug ID: 193355
           Summary: OPIE may not generate passwds from the dictionary
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dan.turner at york.ac.uk

contrib/opie/libopie/btoe.c contains a dictionary, Wp. Wp is _not_ sorted
lexicographically. for instance, "YOU" is immediately before "ABED", line . 

The function wsrch (impl. starts at line 2203) implements a binary search over
Wp, using strncmp as the comparison method. The call strncmp uses lexicographic
ordering, in which "ABED" is considered to be less than "YOU".

Unfortunately, this dictionary is from RFC 2289 & RFC 1760, and is specified in
this order. As such, I don't know how modifying this dictionary order (or the
search order) would behave in relation to these standards.

I cannot spot any location where Wp is being sorted prior to being used, but I
also have not produced proof-of-concept that fails or returns the wrong value,
this code looks suspicious to me though, as I think the pre-conditions of the
binary search are being violated.

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