Red Hat Bugzilla – Bug 1177327
CVE-2015-0973 libpng: Heap-buffer overflow png_combine_row() with very wide interlaced images
Last modified: 2015-03-14 20:59:37 EDT
A heap-based overflow was found in the png_combine_row() function of the libpng library, when very large interlaced images were used. This flaw was fixed in libpng-1.5.21 and 1.6.16. Upstream patch: http://sourceforge.net/p/libpng/code/ci/dc294204b641373bc6eb603075a8b98f51a75dd8/ External Reference: http://seclists.org/oss-sec/2014/q4/1133
When a very large interlaced PNG image in created, such that its width or height exceeds the maximum value allowed for png_uint_32 data type (which is same as uint_32), it results in an integer overflow followed by a heap-based buffer overflow in the png_combine_row() function. The version of libpng as shipped with Red Hat Enterprise Linux, however imposes a limit on the maximum width and height of PNG image, which can be processed by the library. In Red Hat Enterprise Linux 5 and 6 via pngconf.h: # define PNG_USER_WIDTH_MAX 1000000L # define PNG_USER_HEIGHT_MAX 1000000L In Red Hat Enterprise Linux 7 via pngusr.dfa as: "option SAFE_LIMITS on" which in turn leads to: #ifdef PNG_SAFE_LIMITS_SUPPORTED /* 'safe' limits */ # ifndef PNG_USER_WIDTH_MAX # define PNG_USER_WIDTH_MAX 1000000 # endif # ifndef PNG_USER_HEIGHT_MAX # define PNG_USER_HEIGHT_MAX 1000000 # endif # ifndef PNG_USER_CHUNK_CACHE_MAX # define PNG_USER_CHUNK_CACHE_MAX 128 # endif # ifndef PNG_USER_CHUNK_MALLOC_MAX # define PNG_USER_CHUNK_MALLOC_MAX 8000000 # endif in pngpriv.h
Statement: Not vulnerable. This issue does not affect the version of libpng as shipped with Red Hat Enterprise Linux 5, 6 and 7. For a more detailed explanation please refer to: https://bugzilla.redhat.com/show_bug.cgi?id=1177327#c1
This issue does not affect the version of libpng as shipped with Fedora 20 and 21.
*** Bug 1179186 has been marked as a duplicate of this bug. ***
libpng10-1.0.63-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
libpng10-1.0.63-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.
libpng10-1.0.63-1.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.
libpng10-1.0.63-1.el6 has been pushed to the Fedora EPEL 6 stable repository. If problems still persist, please make note of it in this bug report.