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14d8897ca8
boundary access issue in test_compr_eb. PR: ports/197300 Submitted by: Robert Simmons <rsimmons0 gmail com> Approved by: so Security: e543c6f8-abf2-11e4-8ac7-d050992ecde8 MFH: 2015Q1
77 lines
3.1 KiB
C
77 lines
3.1 KiB
C
--- extract.c.orig 2009-03-14 01:32:52 UTC
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+++ extract.c
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@@ -1,5 +1,5 @@
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/*
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- Copyright (c) 1990-2009 Info-ZIP. All rights reserved.
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+ Copyright (c) 1990-2014 Info-ZIP. All rights reserved.
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See the accompanying file LICENSE, version 2009-Jan-02 or later
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(the contents of which are also included in unzip.h) for terms of use.
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@@ -298,6 +298,8 @@ char ZCONST Far TruncNTSD[] =
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#ifndef SFX
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static ZCONST char Far InconsistEFlength[] = "bad extra-field entry:\n \
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EF block length (%u bytes) exceeds remaining EF data (%u bytes)\n";
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+ static ZCONST char Far TooSmallEFlength[] = "bad extra-field entry:\n \
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+ EF block length (%u bytes) invalid (< %d)\n";
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static ZCONST char Far InvalidComprDataEAs[] =
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" invalid compressed data for EAs\n";
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# if (defined(WIN32) && defined(NTSD_EAS))
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@@ -2023,7 +2025,8 @@ static int TestExtraField(__G__ ef, ef_l
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ebID = makeword(ef);
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ebLen = (unsigned)makeword(ef+EB_LEN);
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- if (ebLen > (ef_len - EB_HEADSIZE)) {
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+ if (ebLen > (ef_len - EB_HEADSIZE))
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+ {
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/* Discovered some extra field inconsistency! */
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if (uO.qflag)
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Info(slide, 1, ((char *)slide, "%-22s ",
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@@ -2032,6 +2035,16 @@ static int TestExtraField(__G__ ef, ef_l
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ebLen, (ef_len - EB_HEADSIZE)));
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return PK_ERR;
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}
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+ else if (ebLen < EB_HEADSIZE)
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+ {
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+ /* Extra block length smaller than header length. */
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+ if (uO.qflag)
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+ Info(slide, 1, ((char *)slide, "%-22s ",
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+ FnFilter1(G.filename)));
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+ Info(slide, 1, ((char *)slide, LoadFarString(TooSmallEFlength),
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+ ebLen, EB_HEADSIZE));
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+ return PK_ERR;
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+ }
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switch (ebID) {
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case EF_OS2:
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@@ -2217,14 +2230,28 @@ static int test_compr_eb(__G__ eb, eb_si
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ulg eb_ucsize;
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uch *eb_ucptr;
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int r;
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+ ush method;
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if (compr_offset < 4) /* field is not compressed: */
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return PK_OK; /* do nothing and signal OK */
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+ /* Return no/bad-data error status if any problem is found:
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+ * 1. eb_size is too small to hold the uncompressed size
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+ * (eb_ucsize). (Else extract eb_ucsize.)
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+ * 2. eb_ucsize is zero (invalid). 2014-12-04 SMS.
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+ * 3. eb_ucsize is positive, but eb_size is too small to hold
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+ * the compressed data header.
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+ */
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if ((eb_size < (EB_UCSIZE_P + 4)) ||
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- ((eb_ucsize = makelong(eb+(EB_HEADSIZE+EB_UCSIZE_P))) > 0L &&
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- eb_size <= (compr_offset + EB_CMPRHEADLEN)))
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- return IZ_EF_TRUNC; /* no compressed data! */
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+ ((eb_ucsize = makelong( eb+ (EB_HEADSIZE+ EB_UCSIZE_P))) == 0L) ||
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+ ((eb_ucsize > 0L) && (eb_size <= (compr_offset + EB_CMPRHEADLEN))))
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+ return IZ_EF_TRUNC; /* no/bad compressed data! */
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+
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+ method = makeword(eb + (EB_HEADSIZE + compr_offset));
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+ if ((method == STORED) && (eb_size - compr_offset != eb_ucsize))
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+ return PK_ERR; /* compressed & uncompressed
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+ * should match in STORED
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+ * method */
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if (
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#ifdef INT_16BIT
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