Red Hat Bugzilla – Bug 1191078
CVE-2014-9656 freetype: integer underflow in the tt_sbit_decoder_load_image()
Last modified: 2015-02-19 10:33:13 EST
Common Vulnerabilities and Exposures assigned CVE-2014-9656 to the following issue: The tt_sbit_decoder_load_image function in sfnt/ttsbit.c in FreeType before 2.5.4 does not properly check for an integer overflow, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via a crafted OpenType font. http://code.google.com/p/google-security-research/issues/detail?id=196 http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=f0292bb9920aa1dbfed5f53861e7c7a89b35833a
Created freetype tracking bugs for this issue: Affects: fedora-all [bug 1191099]
Upstream bug is: https://savannah.nongnu.org/bugs/?43680 Issue was fixed upstream in 2.5.4. This is an integer underflow issue in an integer overflow check, which guards against buffer over-read. This can easily trigger crash. The problem was introduced in the following commit: http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=ba931be2 Additionally, prior to upstream version 2.5, affected code was only built and used when FT_CONFIG_OPTION_OLD_INTERNALS macro was not defined. It was defined by default in upstream versions prior to 2.4.12: http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=e4ecce3b The freetype packages in Red Hat Enterprise Linux are based on older upstream versions and do not override this upstream setting, i.e. they define FT_CONFIG_OPTION_OLD_INTERNALS. Therefore, they were not affected by this issue, or the problem commit e4ecce3b attempted to address. Statement: This issue did not affect the versions of freetype as shipped with Red Hat Enterprise Linux 5, 6, and 7.