A stack-based buffer overflow was found in the way tiff2pdf, a TIFF image to a PDF document conversion tool, of libtiff, a library of functions for manipulating TIFF (Tagged Image File Format) image format files, performed write of TIFF image content into particular PDF document file, when malformed image-length and resolution values are used in the TIFF file. A remote attacker could provide a specially-crafted TIFF image format file, that when processed by tiff2pdf would lead to tiff2pdf executable crash. Acknowledgements: Red Hat would like to thank Emmanuel Bouillon (NCI Agency) for reporting this issue.
Here is the affected code (in tiff2pdf.c): 4148 buflen=sprintf(buffer, "%.4f",t2p->pdf_mediabox.y2); t2p->pdf_imagelength is calculated as (float)(t2p->tiff_length))*PS_UNIT_SIZE/t2p->pdf_yres This results in a very large number , sizeof the buffer = 16, and this results in a stack-based buffer overflow in the variable "buffer" RHEl-6 and Fedora builds are compiled with FORTIFY_SOURCE, which results in the crash being limited to DoS and no arbitrary code execution here.
I believe the best response to this is to go on a search-and-destroy mission and change basically all uses of sprintf() to snprintf() in libtiff. Attached are patches to do that.
Created attachment 736471 [details] patch against 4.0 CVS head
Created attachment 736472 [details] patch against 3.9 branch head (will work for 3.9.7)
This issue has been assigned CVE-2013-1961
Created libtiff tracking bugs for this issue Affects: fedora-all [bug 958609]
Created mingw-libtiff tracking bugs for this issue Affects: fedora-all [bug 958610]
Public via: http://seclists.org/oss-sec/2013/q2/254
Patches pushed to upstream CVS.
libtiff-4.0.3-6.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
libtiff-3.9.7-2.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2014:0223 https://rhn.redhat.com/errata/RHSA-2014-0223.html
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2014:0222 https://rhn.redhat.com/errata/RHSA-2014-0222.html
Statement: (none)