[Full-disclosure] gnupg diff available

Hi!

I did a gnupg audit recently. I was, frankly, appalled by the code
quality. It is a desert of pointer manipulation, string copying, memcpy
and strcpy are used all over the place, and sprintf, too.

You can find my diff at

http://dl.fefe.de/gnupg.dif

Please note that

a) I might have missed something
b) I don't claim all fixed parts were exploitable. My attention span
is quite short. If I couldn't figure out where data is coming from
in 30 seconds, I assumed it was user settable and put a fix in.
c) I focused on write accesses. I probably missed a few out of bounds
read accesses. Crashing seems to be an acceptable error handling
mechanism in gnupg (there are already lots of assert() and BUG()
calls) so I also used assert() in most cases.

People are always saying how free and open source software is more
secure because so many eyes look at it… well, I didn't see much
evidence of that in gnupg. Please do use some of your time to actually
look at source code and find bugs.

I tried to give Werner Koch (the author) advance warning, but he was
neither helpful nor did he appear interested. So please don't make
0-days out of this.

Thank you,

Felix

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