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Fedora 8 Update: optipng-0.6.2-1.fc8 Print E-mail
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Posted by Benjamin D. Thomas   
Fedora 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).
Fedora Update Notification
2008-11-13 02:41:03.571449

Name        : optipng
Product     : Fedora 8
Version     : 0.6.2
Release     : 1.fc8
URL         :
Summary     : PNG optimizer and converter
Description :
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.

Update Information:

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 patch #1790969 to fix crash with -log.
- Cosmetic specfile changes.

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

This update can be installed with the "yum" update program.  Use 
su -c 'yum update optipng' at the command line.
For more information, refer to "Managing Software with yum",
available at

All packages are signed with the Fedora Project GPG key.  More details on the
GPG keys used by the Fedora Project can be found at

Fedora-package-announce mailing list
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