On Sun, 2012-04-08 at 20:01 +0200, Mikulas Patocka wrote:
> install links2 and electric-fence package
> run:
> LD_PRELOAD=/usr/lib/libefence.so EF_ALIGNMENT=0 links2 -g
> http://artax.karlin.mff.cuni.cz/~mikulas/debian-libtiff-bug/debian-
> libpng-1.2.44-crash.png
> 
> You get a crash in inflate.

Have you actually verified that the crash has any security impact, or is
this just conjecture?

> I tried it on upstream libpng, upstream versions up to 1.2.47 crash. 1.2.48 
> and
> 1.2.49 dont' crash.
[...]
> This bug is already fixed in libpng-1.2.48 (the buggy function
> png_push_read_zTXt is removed), but Debian didn't backport the fix.

Removal of functions from shared libraries isn't really something that's
going to get backported.

Regards,

Adam




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