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unzip: fix CVE-2014-9636 patch

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Close #6544, fixes #6543.
vcunat: no security impact; just fixes false rejections of some rarer
inputs - a problem introduced by the CVE patch.
This commit is contained in:
mancha 2015-02-23 23:13:00 +00:00 committed by Peter Simons
parent c4ff9d10ba
commit f43d759bc4
1 changed files with 5 additions and 4 deletions
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9
pkgs/tools/archivers/unzip/CVE-2014-9636.diff
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@ -1,6 +1,6 @@
From a9bfab5b52d08879bbc5e0991684b700127ddcff Mon Sep 17 00:00:00 2001
From 190040ebfcf5395a6ccedede2cc9343d34f0a108 Mon Sep 17 00:00:00 2001
From: mancha <mancha1 AT zoho DOT com>
Date: Mon, 3 Nov 2014
Date: Wed, 11 Feb 2015
Subject: Info-ZIP UnZip buffer overflow
By carefully crafting a corrupt ZIP archive with "extra fields" that
@ -26,12 +26,13 @@ This patch ensures that when extra fields use STORED mode, the
if (compr_offset < 4) /* field is not compressed: */
return PK_OK; /* do nothing and signal OK */
@@ -2226,6 +2227,12 @@ static int test_compr_eb(__G__ eb, eb_si
@@ -2226,6 +2227,13 @@ static int test_compr_eb(__G__ eb, eb_si
eb_size <= (compr_offset + EB_CMPRHEADLEN)))
return IZ_EF_TRUNC; /* no compressed data! */
+ method = makeword(eb + (EB_HEADSIZE + compr_offset));
+ if ((method == STORED) && (eb_size - compr_offset != eb_ucsize))
+ if ((method == STORED) &&
+ (eb_size - compr_offset - EB_CMPRHEADLEN != eb_ucsize))
+ return PK_ERR; /* compressed & uncompressed
+ * should match in STORED
+ * method */