Fedora 8 FEDORA-2008-9639 Critical: Optipng Buffer Overflow

OptiPNG is a PNG optimizer that recompresses image files to a smaller size,

without losing any information. This program also converts external formats

(BMP, GIF, PNM and TIFF) to optimized PNG, and performs PNG integrity checks

and corrections.

The main reason for this update is a buffer overflow that is removed in this

version, that could be triggered by processing specially crafted bitmap images

(*.bmp). Aggregated upstream changelog: ============================== ++

Put back a speed optimization, accidentally removed in version 0.6, allowing

singleton trials (-o1) to be bypassed in certain conditions. !! Fixed an array

overflow in the BMP reader. !! Fixed the loss of private chunks under the -snip

option. + Produced a more concise on-screen output in the non-verbose mode.

(Thanks to Vincent Lefevre for the suggestion.) * Added a programming interface

to the optimization engine, in order to facilitate the development of PNG-optimizing GUI apps and plugins. ! Fixed processing when image reduction yields

an output larger than the original. (Thanks to Michael Krishtopa for the

report.) ! Fixed behavior of -preserve. (Thanks to Bill Koch for the report.)

- Removed displaying of partial progress when abandoning IDATs under the -v

option. The percentages displayed were not very accurate. ++ Implemented

grayscale(alpha)-to-palette reductions. ++ Improved conversion of bKGD info

during RGB-to-palette reductions. (Thanks to Matthew Fearnley for the

contribution.) !! Fixed conversion of bKGD and tRNS during 16-to-8-bit

reductions. (Thanks to Matthew Fearnley for the report.) + Added support for

compressed BMP (incl. PNG-compressed BMP, you bet!) + Improved the speed of

reading raw PNM files. + Recognized PNG digital signatures (dSIG) and disabled

optimization in their presence, to preserve their integrity. + Allowed the user

to enforce the optimization of dSIG'ed files. + Recognized APNG animation files

and disabled reductions to preserve their integrity. + Added the -snip option,

to allow the user to "snip" one image out of a multi-image file, such as

animated GIF, multi-page TIFF, or APNG. (Thanks to [LaughingMan] for the

suggestion.) + Improved recovery of PNG files with incomplete IDAT. ! Fixed

behavior of -out and -dir when the input is already optimized. (Thanks to

Christian Davideck for the report.) * Provided more detailed image information

at the start of processing. * Provided a more detailed summary at the end of

processing, under the presence of the -v option and/or the occurence of

exceptional events.

* Wed Nov 12 2008 Till Maas - 0.6.2-1

- Update to new release to fix buffer overflow

- Red Hat Bugzilla #471206

* Thu Aug 28 2008 Ville Skyttä - 0.6.1-1

- 0.6.1.

* Thu Feb 14 2008 Ville Skyttä - 0.5.5-4

- Apply sf.net patch #1790969 to fix crash with -log.

- Cosmetic specfile changes.

[ 1 ] Bug #471206 - OptiPNG: Buffer overflow in BMP image handling reader

https://bugzilla.redhat.com/show_bug.cgi?id=471206

su -c 'yum update optipng' at the command line.

For more information, refer to "Managing Software with yum",

available at .

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