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-rw-r--r--gnu/packages/patches/libtiff-CVE-2017-9935.patch162
1 files changed, 0 insertions, 162 deletions
diff --git a/gnu/packages/patches/libtiff-CVE-2017-9935.patch b/gnu/packages/patches/libtiff-CVE-2017-9935.patch
deleted file mode 100644
index 5685d81f68..0000000000
--- a/gnu/packages/patches/libtiff-CVE-2017-9935.patch
+++ /dev/null
@@ -1,162 +0,0 @@
-Fix CVE-2017-9935
-
-https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-9935
-http://bugzilla.maptools.org/show_bug.cgi?id=2704
-
-Patch copied from upstream source repository:
-
-https://gitlab.com/libtiff/libtiff/commit/3dd8f6a357981a4090f126ab9025056c938b6940
-
-From 3dd8f6a357981a4090f126ab9025056c938b6940 Mon Sep 17 00:00:00 2001
-From: Brian May <brian@linuxpenguins.xyz>
-Date: Thu, 7 Dec 2017 07:46:47 +1100
-Subject: [PATCH] tiff2pdf: Fix CVE-2017-9935
-
-Fix for http://bugzilla.maptools.org/show_bug.cgi?id=2704
-
-This vulnerability - at least for the supplied test case - is because we
-assume that a tiff will only have one transfer function that is the same
-for all pages. This is not required by the TIFF standards.
-
-We than read the transfer function for every page. Depending on the
-transfer function, we allocate either 2 or 4 bytes to the XREF buffer.
-We allocate this memory after we read in the transfer function for the
-page.
-
-For the first exploit - POC1, this file has 3 pages. For the first page
-we allocate 2 extra extra XREF entries. Then for the next page 2 more
-entries. Then for the last page the transfer function changes and we
-allocate 4 more entries.
-
-When we read the file into memory, we assume we have 4 bytes extra for
-each and every page (as per the last transfer function we read). Which
-is not correct, we only have 2 bytes extra for the first 2 pages. As a
-result, we end up writing past the end of the buffer.
-
-There are also some related issues that this also fixes. For example,
-TIFFGetField can return uninitalized pointer values, and the logic to
-detect a N=3 vs N=1 transfer function seemed rather strange.
-
-It is also strange that we declare the transfer functions to be of type
-float, when the standard says they are unsigned 16 bit values. This is
-fixed in another patch.
-
-This patch will check to ensure that the N value for every transfer
-function is the same for every page. If this changes, we abort with an
-error. In theory, we should perhaps check that the transfer function
-itself is identical for every page, however we don't do that due to the
-confusion of the type of the data in the transfer function.
----
- libtiff/tif_dir.c | 3 +++
- tools/tiff2pdf.c | 65 +++++++++++++++++++++++++++++++++++++------------------
- 2 files changed, 47 insertions(+), 21 deletions(-)
-
-diff --git a/libtiff/tif_dir.c b/libtiff/tif_dir.c
-index 2ccaf448..cbf2b693 100644
---- a/libtiff/tif_dir.c
-+++ b/libtiff/tif_dir.c
-@@ -1065,6 +1065,9 @@ _TIFFVGetField(TIFF* tif, uint32 tag, va_list ap)
- if (td->td_samplesperpixel - td->td_extrasamples > 1) {
- *va_arg(ap, uint16**) = td->td_transferfunction[1];
- *va_arg(ap, uint16**) = td->td_transferfunction[2];
-+ } else {
-+ *va_arg(ap, uint16**) = NULL;
-+ *va_arg(ap, uint16**) = NULL;
- }
- break;
- case TIFFTAG_REFERENCEBLACKWHITE:
-diff --git a/tools/tiff2pdf.c b/tools/tiff2pdf.c
-index d1a9b095..c3ec0746 100644
---- a/tools/tiff2pdf.c
-+++ b/tools/tiff2pdf.c
-@@ -1047,6 +1047,8 @@ void t2p_read_tiff_init(T2P* t2p, TIFF* input){
- uint16 pagen=0;
- uint16 paged=0;
- uint16 xuint16=0;
-+ uint16 tiff_transferfunctioncount=0;
-+ float* tiff_transferfunction[3];
-
- directorycount=TIFFNumberOfDirectories(input);
- t2p->tiff_pages = (T2P_PAGE*) _TIFFmalloc(TIFFSafeMultiply(tmsize_t,directorycount,sizeof(T2P_PAGE)));
-@@ -1147,26 +1149,48 @@ void t2p_read_tiff_init(T2P* t2p, TIFF* input){
- }
- #endif
- if (TIFFGetField(input, TIFFTAG_TRANSFERFUNCTION,
-- &(t2p->tiff_transferfunction[0]),
-- &(t2p->tiff_transferfunction[1]),
-- &(t2p->tiff_transferfunction[2]))) {
-- if((t2p->tiff_transferfunction[1] != (float*) NULL) &&
-- (t2p->tiff_transferfunction[2] != (float*) NULL) &&
-- (t2p->tiff_transferfunction[1] !=
-- t2p->tiff_transferfunction[0])) {
-- t2p->tiff_transferfunctioncount = 3;
-- t2p->tiff_pages[i].page_extra += 4;
-- t2p->pdf_xrefcount += 4;
-- } else {
-- t2p->tiff_transferfunctioncount = 1;
-- t2p->tiff_pages[i].page_extra += 2;
-- t2p->pdf_xrefcount += 2;
-- }
-- if(t2p->pdf_minorversion < 2)
-- t2p->pdf_minorversion = 2;
-+ &(tiff_transferfunction[0]),
-+ &(tiff_transferfunction[1]),
-+ &(tiff_transferfunction[2]))) {
-+
-+ if((tiff_transferfunction[1] != (float*) NULL) &&
-+ (tiff_transferfunction[2] != (float*) NULL)
-+ ) {
-+ tiff_transferfunctioncount=3;
-+ } else {
-+ tiff_transferfunctioncount=1;
-+ }
- } else {
-- t2p->tiff_transferfunctioncount=0;
-+ tiff_transferfunctioncount=0;
- }
-+
-+ if (i > 0){
-+ if (tiff_transferfunctioncount != t2p->tiff_transferfunctioncount){
-+ TIFFError(
-+ TIFF2PDF_MODULE,
-+ "Different transfer function on page %d",
-+ i);
-+ t2p->t2p_error = T2P_ERR_ERROR;
-+ return;
-+ }
-+ }
-+
-+ t2p->tiff_transferfunctioncount = tiff_transferfunctioncount;
-+ t2p->tiff_transferfunction[0] = tiff_transferfunction[0];
-+ t2p->tiff_transferfunction[1] = tiff_transferfunction[1];
-+ t2p->tiff_transferfunction[2] = tiff_transferfunction[2];
-+ if(tiff_transferfunctioncount == 3){
-+ t2p->tiff_pages[i].page_extra += 4;
-+ t2p->pdf_xrefcount += 4;
-+ if(t2p->pdf_minorversion < 2)
-+ t2p->pdf_minorversion = 2;
-+ } else if (tiff_transferfunctioncount == 1){
-+ t2p->tiff_pages[i].page_extra += 2;
-+ t2p->pdf_xrefcount += 2;
-+ if(t2p->pdf_minorversion < 2)
-+ t2p->pdf_minorversion = 2;
-+ }
-+
- if( TIFFGetField(
- input,
- TIFFTAG_ICCPROFILE,
-@@ -1828,9 +1852,8 @@ void t2p_read_tiff_data(T2P* t2p, TIFF* input){
- &(t2p->tiff_transferfunction[1]),
- &(t2p->tiff_transferfunction[2]))) {
- if((t2p->tiff_transferfunction[1] != (float*) NULL) &&
-- (t2p->tiff_transferfunction[2] != (float*) NULL) &&
-- (t2p->tiff_transferfunction[1] !=
-- t2p->tiff_transferfunction[0])) {
-+ (t2p->tiff_transferfunction[2] != (float*) NULL)
-+ ) {
- t2p->tiff_transferfunctioncount=3;
- } else {
- t2p->tiff_transferfunctioncount=1;
---
-2.16.1
-
generated by cgit v1.2.3 (git 2.46.2) at 2024-11-10 17:31:12 +0000