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Category:   Application (Generic)  >   libpng Vendors:   libpng.sourceforge.net
libpng Chunk Handling Bugs Let Remote Users Deny Service
SecurityTracker Alert ID:  1018849
SecurityTracker URL:  http://securitytracker.com/id/1018849
CVE Reference:   CVE-2007-5269   (Links to External Site)
Date:  Oct 23 2007
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.2 prior to 1.2.21 and 1.0 prior to 1.0.29
Description:   A vulnerability was reported in libpng. A remote user can cause denial of service conditions.

A remote user can create a specially crafted image that, when loaded by the target application, will trigger an out-of-bounds read error in certain chunk handlers and cause the target application to crash.

The png_handle_pCAL(), png_handle_sCAL(), png_push_read_tEXt(), png_handle_iTXt(), and png_handle_ztXt() functions are affected.

George Cook and Jeff Phillips reported this vulnerability.

Impact:   A remote user can cause denial of service conditions.
Solution:   The vendor has issued fixed versions (1.2.21 and 1.0.29).

The vendor's advisory is available at:

http://sourceforge.net/mailarchive/message.php?msg_name=3.0.6.32.20071004082318.012a7628%40mail.comcast.net

Vendor URL:  libpng.sourceforge.net/ (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 23 2007 (Red Hat Issues Fix) libpng Chunk Handling Bugs Let Remote Users Deny Service   (bugzilla@redhat.com)
Red Hat has released a fix for Red Hat Enterprise Linux 2.1, 3, 4, and 5.
May 30 2009 (Sun Issues Fix) libpng Chunk Handling Bugs Let Remote Users Deny Service
Sun has issued a fix for Solaris 10 and OpenSolaris.



 Source Message Contents

Date:  Tue, 23 Oct 2007 15:55:02 -0400
Subject:  libpng


CVE-2007-5269

[png-mng-implement] Libpng-1.2.21 and libpng-1.0.29 released

Libpng-1.2.21 and libpng-1.0.29 have been released and are available at
ftp://ftp.simplesystems.org/pub/png/src
and at
http://libpng.sf.net

Fixed various mistakes reported by George Cook and Jeff Phillips:
logical vs bitwise NOT in pngrtran.c, bug introduced in 1.2.19
16-bit cheap transparency expansion, bug introduced in 1.2.19
errors with sizeof(unknown_chunk.name), bugs introduced in 1.2.19
<= compare with unsigned var in pngset.c, should be ==.
Removed some extraneous typecasts.
Fixed potential out-of-bounds read in png_handle_pCAL(), png_handle_sCAL(),
png_push_read_tEXt(), png_handle_iTXt(), and png_handle_ztXt() ("flayer"
results reported by Tavis Ormandy).
Remove some PNG_CONST declarations from pngwutil.c to avoid compiler warnings
Revised makefiles to update libpng.pc properly.

Glenn 
 
 


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