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From: sms
Subject: Fix CVE-2014-8141: out-of-bounds read issues in getZip64Data()
Bug-Debian: http://bugs.debian.org/773722
--- a/fileio.c
+++ b/fileio.c
@@ -176,6 +176,8 @@
#endif
static ZCONST char Far ExtraFieldTooLong[] =
"warning: extra field too long (%d). Ignoring...\n";
+static ZCONST char Far ExtraFieldCorrupt[] =
+ "warning: extra field (type: 0x%04x) corrupt. Continuing...\n";
#ifdef WINDLL
static ZCONST char Far DiskFullQuery[] =
@@ -2295,7 +2297,12 @@
if (readbuf(__G__ (char *)G.extra_field, length) == 0)
return PK_EOF;
/* Looks like here is where extra fields are read */
- getZip64Data(__G__ G.extra_field, length);
+ if (getZip64Data(__G__ G.extra_field, length) != PK_COOL)
+ {
+ Info(slide, 0x401, ((char *)slide,
+ LoadFarString( ExtraFieldCorrupt), EF_PKSZ64));
+ error = PK_WARN;
+ }
#ifdef UNICODE_SUPPORT
G.unipath_filename = NULL;
if (G.UzO.U_flag < 2) {
--- a/process.c
+++ b/process.c
@@ -1,5 +1,5 @@
/*
- Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
+ Copyright (c) 1990-2014 Info-ZIP. All rights reserved.
See the accompanying file LICENSE, version 2009-Jan-02 or later
(the contents of which are also included in unzip.h) for terms of use.
@@ -1901,48 +1901,82 @@
and a 4-byte version of disk start number.
Sets both local header and central header fields. Not terribly clever,
but it means that this procedure is only called in one place.
+
+ 2014-12-05 SMS.
+ Added checks to ensure that enough data are available before calling
+ makeint64() or makelong(). Replaced various sizeof() values with
+ simple ("4" or "8") constants. (The Zip64 structures do not depend
+ on our variable sizes.) Error handling is crude, but we should now
+ stay within the buffer.
---------------------------------------------------------------------------*/
+#define Z64FLGS 0xffff
+#define Z64FLGL 0xffffffff
+
if (ef_len == 0 || ef_buf == NULL)
return PK_COOL;
Trace((stderr,"\ngetZip64Data: scanning extra field of length %u\n",
ef_len));
- while (ef_len >= EB_HEADSIZE) {
+ while (ef_len >= EB_HEADSIZE)
+ {
eb_id = makeword(EB_ID + ef_buf);
eb_len = makeword(EB_LEN + ef_buf);
- if (eb_len > (ef_len - EB_HEADSIZE)) {
- /* discovered some extra field inconsistency! */
+ if (eb_len > (ef_len - EB_HEADSIZE))
+ {
+ /* Extra block length exceeds remaining extra field length. */
Trace((stderr,
"getZip64Data: block length %u > rest ef_size %u\n", eb_len,
ef_len - EB_HEADSIZE));
break;
}
- if (eb_id == EF_PKSZ64) {
-
+ if (eb_id == EF_PKSZ64)
+ {
int offset = EB_HEADSIZE;
- if (G.crec.ucsize == 0xffffffff || G.lrec.ucsize == 0xffffffff){
- G.lrec.ucsize = G.crec.ucsize = makeint64(offset + ef_buf);
- offset += sizeof(G.crec.ucsize);
+ if ((G.crec.ucsize == Z64FLGL) || (G.lrec.ucsize == Z64FLGL))
+ {
+ if (offset+ 8 > ef_len)
+ return PK_ERR;
+
+ G.crec.ucsize = G.lrec.ucsize = makeint64(offset + ef_buf);
+ offset += 8;
}
- if (G.crec.csize == 0xffffffff || G.lrec.csize == 0xffffffff){
- G.csize = G.lrec.csize = G.crec.csize = makeint64(offset + ef_buf);
- offset += sizeof(G.crec.csize);
+
+ if ((G.crec.csize == Z64FLGL) || (G.lrec.csize == Z64FLGL))
+ {
+ if (offset+ 8 > ef_len)
+ return PK_ERR;
+
+ G.csize = G.crec.csize = G.lrec.csize = makeint64(offset + ef_buf);
+ offset += 8;
}
- if (G.crec.relative_offset_local_header == 0xffffffff){
+
+ if (G.crec.relative_offset_local_header == Z64FLGL)
+ {
+ if (offset+ 8 > ef_len)
+ return PK_ERR;
+
G.crec.relative_offset_local_header = makeint64(offset + ef_buf);
- offset += sizeof(G.crec.relative_offset_local_header);
+ offset += 8;
}
- if (G.crec.disk_number_start == 0xffff){
+
+ if (G.crec.disk_number_start == Z64FLGS)
+ {
+ if (offset+ 4 > ef_len)
+ return PK_ERR;
+
G.crec.disk_number_start = (zuvl_t)makelong(offset + ef_buf);
- offset += sizeof(G.crec.disk_number_start);
+ offset += 4;
}
+#if 0
+ break; /* Expect only one EF_PKSZ64 block. */
+#endif /* 0 */
}
- /* Skip this extra field block */
+ /* Skip this extra field block. */
ef_buf += (eb_len + EB_HEADSIZE);
ef_len -= (eb_len + EB_HEADSIZE);
}
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