Uočene ranjivosti posljedica su preljeva međuspremnika te neadekvatne provjere ulaznih podataka u pojedinim programskim funkcijama. Riječ o sljedećim funkcijama „png_format_buffer“, „png_err function“ te „png_handle_sCAL“.
Posljedica:
Uspješnim iskorištavanje sigurnosnih propusta udaljeni napadač može izmijeniti podatke pohranjene u memoriji, pokrenuti napad uskraćivanja usluga te izazvati druge nespecificirane posljedice.
Rješenje:
Kako bi riješili otkrivene probleme, korisnici trebaju instalirati najnoviju inačicu biblioteke.
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Fedora Update Notification
FEDORA-2011-9336
2011-07-15 00:41:53
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Name : libpng
Product : Fedora 14
Version : 1.2.46
Release : 1.fc14
URL : http://www.libpng.org/pub/png/
Summary : A library of functions for manipulating PNG image format files
Description :
The libpng package contains a library of functions for creating and
manipulating PNG (Portable Network Graphics) image format files. PNG
is a bit-mapped graphics format similar to the GIF format. PNG was
created to replace the GIF format, since GIF uses a patented data
compression algorithm.
Libpng should be installed if you need to manipulate PNG format image
files.
--------------------------------------------------------------------------------
Update Information:
Update to libpng 1.2.46, includes fixes for CVE-2011-2501, CVE-2011-2690,
CVE-2011-2691, CVE-2011-2692
--------------------------------------------------------------------------------
ChangeLog:
* Thu Jul 14 2011 Tom Lane <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.> 2:1.2.46-1
- Update to libpng 1.2.46, includes fixes for CVE-2011-2501, CVE-2011-2690,
CVE-2011-2691, CVE-2011-2692
Resolves: #717509
Resolves: #721307
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References:
[ 1 ] Bug #720607 - CVE-2011-2690 libpng: buffer overwrite in
png_rgb_to_gray
https://bugzilla.redhat.com/show_bug.cgi?id=720607
[ 2 ] Bug #720608 - CVE-2011-2691 libpng: Crash in png_default_error due to
use of NULL Pointer
https://bugzilla.redhat.com/show_bug.cgi?id=720608
[ 3 ] Bug #720612 - CVE-2011-2692 libpng: Invalid read when handling empty
sCAL chunks
https://bugzilla.redhat.com/show_bug.cgi?id=720612
[ 4 ] Bug #717084 - CVE-2011-2501 libpng: regression of CVE-2004-0421 in
1.2.23+
https://bugzilla.redhat.com/show_bug.cgi?id=717084
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This update can be installed with the "yum" update program. Use
su -c 'yum update libpng' at the command line.
For more information, refer to "Managing Software with yum",
available at http://docs.fedoraproject.org/yum/.
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
https://fedoraproject.org/keys
--------------------------------------------------------------------------------
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