Buffer overflow in libpng 1.0.x before 1.0.55, 1.2.x before 1.2.45, 1.4.x before 1.4.8, and 1.5.x before 1.5.4, when used by an application that calls the pngrgbtogray function but not the pngsetexpand function, allows remote attackers to overwrite memory with an arbitrary amount of data, and possibly have unspecified other impact, via a crafted PNG image.
It was found that libpng read uninitialized memory when it encountered a sCAL chunk that is empty, and improperly handles a sCAL chunk that lacks the terminating zero between the two strings that it conveys.
This was fixed in libpng-1.5.4, libpng-1.4.8, libpng-1.2.45, and libpng-1.0.55.
Patch: http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng/libpng;a=commitdiff;h=61a2d8a2a7b03023e63eae9a3e64607aaaa6d339
The pngsettext2 function in pngset.c in libpng 1.0.x before 1.0.59, 1.2.x before 1.2.49, 1.4.x before 1.4.11, and 1.5.x before 1.5.10 allows remote attackers to cause a denial of service (crash) or execute arbitrary code via a crafted text chunk in a PNG image file, which triggers a memory allocation failure that is not properly handled, leading to a heap-based buffer overflow.
It was reported [1] that the fix for CVE-2004-0421 in libpng was inadvertently reverted during the 1.2.23 development cycle. The original flaw could be used to cause a denial of service via a carefully-crafted PNG image.
This would affect all versions of libpng >=1.2.23, including 1.4.x and 1.5.x.
[1] http://sourceforge.net/mailarchive/forum.php?threadname=BANLkTikrnU6FJNQYFvwmt78hwpgKPVRd1Q%40mail.gmail.com&forumname=png-mng-implement
It was found that in libpng, prior to 1.2.45, the error function received a NULL pointer, expressed erroneously as '\0', instead of the empty string "". This error was introduced in libpng-1.2.20, and pngdefaulterror() will crash in this case.
This was be fixed in libpng-1.5.4, libpng-1.4.8, libpng-1.2.45, and libpng-1.0.55.
Patch: http://libpng.git.sourceforge.net/git/gitweb.cgi?p=libpng/libpng;a=commitdiff;h=9dad5e37aef295b4ef8dea39392b652deebc9261
An out-of-bounds read in pngconverttorfc1123 in png.c was found.
Upstream bug:
http://sourceforge.net/p/libpng/bugs/241/
Upstream patch:
http://sourceforge.net/p/libpng/code/ci/fbf0f024346ca0a4ffc64b082a95c6b6bb6d29c4/
CVE assignment:
http://seclists.org/oss-sec/2015/q4/161
Memory leak in pngwutil.c in libpng 1.2.13beta1, and other versions before 1.2.15beta3, allows context-dependent attackers to cause a denial of service (memory leak or segmentation fault) via a JPEG image containing an iCCP chunk with a negative embedded profile length.