wok view tiff/stuff/libtiff-CVE-2011-0192.patch @ rev 9544
tiff: Patched overflows that could lead to aribitrary code execution when parsing a malformed image file. Thanks slackware for having this.
| author | Christopher Rogers <slaxemulator@gmail.com> |
|---|---|
| date | Sat Apr 09 07:21:58 2011 +0000 (2011-04-09) |
| parents | |
| children |
line source
1 Protect against a fax VL(n) codeword commanding a move left. Without
2 this, a malicious input file can generate an indefinitely large series
3 of runs without a0 ever reaching the right margin, thus overrunning
4 our buffer of run lengths. Per CVE-2011-0192. This is a modified
5 version of a patch proposed by Drew Yao of Apple Product Security.
6 It adds an unexpected() report, and disallows the equality case except
7 for the first run of a line, since emitting a run without increasing a0
8 still allows buffer overrun. (We have to allow it for the first run to
9 cover the case of encoding a zero-length run at start of line using VL.)
12 diff -Naur tiff-3.9.4.orig/libtiff/tif_fax3.h tiff-3.9.4/libtiff/tif_fax3.h
13 --- tiff-3.9.4.orig/libtiff/tif_fax3.h 2010-06-08 14:50:42.000000000 -0400
14 +++ tiff-3.9.4/libtiff/tif_fax3.h 2011-03-10 12:11:20.850839162 -0500
15 @@ -478,6 +478,12 @@
16 break; \
17 case S_VL: \
18 CHECK_b1; \
19 + if (b1 <= (int) (a0 + TabEnt->Param)) { \
20 + if (b1 < (int) (a0 + TabEnt->Param) || pa != thisrun) { \
21 + unexpected("VL", a0); \
22 + goto eol2d; \
23 + } \
24 + } \
25 SETVALUE(b1 - a0 - TabEnt->Param); \
26 b1 -= *--pb; \
27 break; \