Red Hat Bugzilla – Bug 1191094
CVE-2014-9671 freetype: integer overflow in pcf_get_properties() leading to NULL pointer dereference
Last modified: 2015-11-25 05:29:11 EST
Common Vulnerabilities and Exposures assigned CVE-2014-9671 to the following issue: Off-by-one error in the pcf_get_properties function in pcf/pcfread.c in FreeType before 2.5.4 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a crafted PCF file with a 0xffffffff size value that is improperly incremented. http://code.google.com/p/google-security-research/issues/detail?id=157 http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=0e2f5d518c60e2978f26400d110eff178fa7e3c3
Upstream bug is: https://savannah.nongnu.org/bugs/?43547 Issue was fixed upstream in 2.5.4. This is an integer overflow issue, rather than off-by-one. A string_size value is read from input font file. If value 0xffffffff is used and later 1 is added to it when FT_NEW_ARRAY() is called to allocate strings[] buffer, the addition will overflow (32bit overflow) and leads to attempt to allocate zero sized buffer. Freetype memory allocation functions return NULL in that case, which leads to crash when the buffer is populated later. Note that this issue was introduced by the CVE-2012-1130 fix (see bug 800587) in the following commit: http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=c776fc17
The fix for this issue was found to introduce a regression that prevented loading of certain PCF fonts. Upstream bug and fix: https://savannah.nongnu.org/bugs/?43774 http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=74af85c4b62b35e55b0ce9dec55ee10cbc4962a2 http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=06842c7b49c21f13c0ab61201daab6ff5a358fcc Reported for Fedora in bug 1195652.
This issue has been addressed in the following products: Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Via RHSA-2015:0696 https://rhn.redhat.com/errata/RHSA-2015-0696.html