diff options
Diffstat (limited to 'source/l/libtiff/libtiff-CVE-2011-0192.patch')
| -rw-r--r-- | source/l/libtiff/libtiff-CVE-2011-0192.patch | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/source/l/libtiff/libtiff-CVE-2011-0192.patch b/source/l/libtiff/libtiff-CVE-2011-0192.patch new file mode 100644 index 000000000..892f70e01 --- /dev/null +++ b/source/l/libtiff/libtiff-CVE-2011-0192.patch @@ -0,0 +1,27 @@ +Protect against a fax VL(n) codeword commanding a move left. Without +this, a malicious input file can generate an indefinitely large series +of runs without a0 ever reaching the right margin, thus overrunning +our buffer of run lengths. Per CVE-2011-0192. This is a modified +version of a patch proposed by Drew Yao of Apple Product Security. +It adds an unexpected() report, and disallows the equality case except +for the first run of a line, since emitting a run without increasing a0 +still allows buffer overrun. (We have to allow it for the first run to +cover the case of encoding a zero-length run at start of line using VL.) + + +diff -Naur tiff-3.9.4.orig/libtiff/tif_fax3.h tiff-3.9.4/libtiff/tif_fax3.h +--- tiff-3.9.4.orig/libtiff/tif_fax3.h 2010-06-08 14:50:42.000000000 -0400 ++++ tiff-3.9.4/libtiff/tif_fax3.h 2011-03-10 12:11:20.850839162 -0500 +@@ -478,6 +478,12 @@ + break; \ + case S_VL: \ + CHECK_b1; \ ++ if (b1 <= (int) (a0 + TabEnt->Param)) { \ ++ if (b1 < (int) (a0 + TabEnt->Param) || pa != thisrun) { \ ++ unexpected("VL", a0); \ ++ goto eol2d; \ ++ } \ ++ } \ + SETVALUE(b1 - a0 - TabEnt->Param); \ + b1 -= *--pb; \ + break; \ |