Add several patches dealing with the false positive zipbomb detection
Resolves: rhbz#1954651
This commit is contained in:
Jakub Martisko
parent
83404d72fa
commit
bdd9545b10
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@ -0,0 +1,25 @@
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From 5e2efcd633a4a1fb95a129a75508e7d769e767be Mon Sep 17 00:00:00 2001
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From: Mark Adler <madler@alumni.caltech.edu>
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Date: Sun, 9 Feb 2020 20:36:28 -0800
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Subject: [PATCH] Fix bug in UZbunzip2() that incorrectly updated G.incnt.
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The update assumed a full buffer, which is not always full. This
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could result in a false overlapped element detection when a small
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bzip2-compressed file was unzipped. This commit remedies that.
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---
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extract.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/extract.c b/extract.c
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index d9866f9..0cb7bfc 100644
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--- a/extract.c
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+++ b/extract.c
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@@ -3010,7 +3010,7 @@ __GDEF
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#endif
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G.inptr = (uch *)bstrm.next_in;
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- G.incnt = (G.inbuf + INBUFSIZ) - G.inptr; /* reset for other routines */
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+ G.incnt -= G.inptr - G.inbuf; /* reset for other routines */
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uzbunzip_cleanup_exit:
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err = BZ2_bzDecompressEnd(&bstrm);
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@ -0,0 +1,26 @@
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From 5c572555cf5d80309a07c30cf7a54b2501493720 Mon Sep 17 00:00:00 2001
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From: Mark Adler <madler@alumni.caltech.edu>
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Date: Sun, 9 Feb 2020 21:39:09 -0800
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Subject: [PATCH] Fix bug in UZinflate() that incorrectly updated G.incnt.
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The update assumed a full buffer, which is not always full. This
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could result in a false overlapped element detection when a small
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deflate-compressed file was unzipped using an old zlib. This
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commit remedies that.
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---
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inflate.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/inflate.c b/inflate.c
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index 2f5a015..70e3cc0 100644
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--- a/inflate.c
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+++ b/inflate.c
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@@ -700,7 +700,7 @@ int UZinflate(__G__ is_defl64)
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G.dstrm.total_out));
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G.inptr = (uch *)G.dstrm.next_in;
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- G.incnt = (G.inbuf + INBUFSIZ) - G.inptr; /* reset for other routines */
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+ G.incnt -= G.inptr - G.inbuf; /* reset for other routines */
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uzinflate_cleanup_exit:
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err = inflateReset(&G.dstrm);
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@ -0,0 +1,95 @@
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From 122050bac16fae82a460ff739fb1ca0f106e9d85 Mon Sep 17 00:00:00 2001
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From: Mark Adler <madler@alumni.caltech.edu>
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Date: Sat, 2 Jan 2021 13:09:34 -0800
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Subject: [PATCH] Determine Zip64 status entry-by-entry instead of for entire
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file.
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Fixes a bug for zip files with mixed Zip64 and not Zip64 entries,
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which resulted in an incorrect data descriptor length. The bug is
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seen when a Zip64 entry precedes a non-Zip64 entry, in which case
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the data descriptor would have been assumed to be larger than it
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is, resulting in an incorrect bomb warning due to a perceived
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overlap with the next entry. This commit determines and saves the
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Zip64 status for each entry based on the central directory, and
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then computes the length of each data descriptor accordingly.
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---
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extract.c | 5 +++--
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globals.h | 2 --
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process.c | 4 +---
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unzpriv.h | 1 +
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4 files changed, 5 insertions(+), 7 deletions(-)
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diff --git a/extract.c b/extract.c
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index 504afd6..878817d 100644
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--- a/extract.c
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+++ b/extract.c
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@@ -658,6 +658,7 @@ int extract_or_test_files(__G) /* return PK-type error code */
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break;
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}
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}
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+ G.pInfo->zip64 = FALSE;
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if ((error = do_string(__G__ G.crec.extra_field_length,
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EXTRA_FIELD)) != 0)
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{
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@@ -2187,12 +2188,12 @@ static int extract_or_test_member(__G) /* return PK-type error code */
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(clen == SIG && /* if not SIG, no signature */
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((G.lrec.csize & LOW) != SIG || /* if not SIG, have signature */
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(ulen == SIG && /* if not SIG, no signature */
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- (G.zip64 ? G.lrec.csize >> 32 : G.lrec.ucsize) != SIG
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+ (G.pInfo->zip64 ? G.lrec.csize >> 32 : G.lrec.ucsize) != SIG
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/* if not SIG, have signature */
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)))))
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/* skip four more bytes to account for signature */
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shy += 4 - readbuf((char *)buf, 4);
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- if (G.zip64)
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+ if (G.pInfo->zip64)
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shy += 8 - readbuf((char *)buf, 8); /* skip eight more for ZIP64 */
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if (shy)
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error = PK_ERR;
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diff --git a/globals.h b/globals.h
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index f9c6daf..a883c90 100644
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--- a/globals.h
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+++ b/globals.h
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@@ -261,8 +261,6 @@ typedef struct Globals {
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ecdir_rec ecrec; /* used in unzip.c, extract.c */
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z_stat statbuf; /* used by main, mapname, check_for_newer */
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- int zip64; /* true if Zip64 info in extra field */
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-
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int mem_mode;
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uch *outbufptr; /* extract.c static */
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ulg outsize; /* extract.c static */
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diff --git a/process.c b/process.c
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index d75d405..d643c6f 100644
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--- a/process.c
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+++ b/process.c
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@@ -1903,8 +1903,6 @@ int getZip64Data(__G__ ef_buf, ef_len)
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#define Z64FLGS 0xffff
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#define Z64FLGL 0xffffffff
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- G.zip64 = FALSE;
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-
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if (ef_len == 0 || ef_buf == NULL)
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return PK_COOL;
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@@ -1943,7 +1941,7 @@ int getZip64Data(__G__ ef_buf, ef_len)
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break; /* Expect only one EF_PKSZ64 block. */
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#endif /* 0 */
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- G.zip64 = TRUE;
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+ G.pInfo->zip64 = TRUE;
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}
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/* Skip this extra field block. */
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diff --git a/unzpriv.h b/unzpriv.h
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index 09f288e..75b3359 100644
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--- a/unzpriv.h
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+++ b/unzpriv.h
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@@ -2034,6 +2034,7 @@ typedef struct min_info {
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#ifdef UNICODE_SUPPORT
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unsigned GPFIsUTF8: 1; /* crec gen_purpose_flag UTF-8 bit 11 is set */
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#endif
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+ unsigned zip64: 1; /* true if entry has Zip64 extra block */
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#ifndef SFX
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char Far *cfilname; /* central header version of filename */
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#endif
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12
unzip.spec
12
unzip.spec
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@ -7,7 +7,7 @@
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Summary: A utility for unpacking zip files
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Name: unzip
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Version: 6.0
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Release: 51%{?dist}
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Release: 52%{?dist}
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License: BSD
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Source: http://downloads.sourceforge.net/infozip/unzip60.tar.gz
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@ -68,6 +68,9 @@ Patch26: unzip-zipbomb-part1.patch
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Patch27: unzip-zipbomb-part2.patch
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Patch28: unzip-zipbomb-part3.patch
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Patch29: unzip-zipbomb-manpage.patch
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Patch30: unzip-zipbomb-part4.patch
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Patch31: unzip-zipbomb-part5.patch
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Patch32: unzip-zipbomb-part6.patch
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URL: http://www.info-zip.org/UnZip.html
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BuildRequires: make
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@ -116,6 +119,9 @@ a zip archive.
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%patch27 -p1
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%patch28 -p1
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%patch29 -p1
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%patch30 -p1
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%patch31 -p1
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%patch32 -p1
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%build
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# IZ_HAVE_UXUIDGID is needed for right functionality of unzip -X
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@ -135,6 +141,10 @@ make -f unix/Makefile prefix=$RPM_BUILD_ROOT%{_prefix} MANDIR=$RPM_BUILD_ROOT/%{
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%{_mandir}/*/*
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%changelog
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* Fri Apr 30 2021 Jakub Martisko <jamartis@redhat.com> - 6.0-52
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- Add several patches dealing with false positice zipbomb detection
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Resolves: #1954651
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* Fri Apr 16 2021 Mohan Boddu <mboddu@redhat.com> - 6.0-51
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- Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937
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