image format processing issues: lack of input validation

Debian Bug report logs - #742730
image format processing issues: lack of input validation

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Reported by: Michael Tokarev <mjt@tls.msk.ru>

Date: Wed, 26 Mar 2014 18:21:02 UTC

Severity: important

Tags: patch, security, upstream

Found in version 1.1.2+dfsg-6

Fixed in version qemu/2.0.0+dfsg-6

Done: Michael Tokarev <mjt@tls.msk.ru>

Bug is archived. No further changes may be made.

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Report forwarded to debian-bugs-dist@lists.debian.org, team@security.debian.org, secure-testing-team@lists.alioth.debian.org, Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>:
Bug#742730; Package qemu, qemu-kvm. (Wed, 26 Mar 2014 18:21:07 GMT) (full text, mbox, link).


Acknowledgement sent to Michael Tokarev <mjt@tls.msk.ru>:
New Bug report received and forwarded. Copy sent to team@security.debian.org, secure-testing-team@lists.alioth.debian.org, Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>. (Wed, 26 Mar 2014 18:21:07 GMT) (full text, mbox, link).


Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Michael Tokarev <mjt@tls.msk.ru>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: image format processing issues: lack of input validation
Date: Wed, 26 Mar 2014 22:19:00 +0400
Package: qemu, qemu-kvm
Version: 1.1.2+dfsg-6
Severity: grave
Tags: security patch upstream

Several flaws were found in guest image format processing in qemu.

CVEs are as follows:
parallels: Sanity check for s->tracks (CVE-2014-0142)
parallels: Fix catalog size integer overflow (CVE-2014-0143)
qcow2: Check maximum L1 size in qcow2_snapshot_load_tmp() (CVE-2014-0143)
qcow2: Fix L1 allocation size in qcow2_snapshot_load_tmp() (CVE-2014-0145)
qcow2: Fix NULL dereference in qcow2_open() error path (CVE-2014-0146)
block: Limit request size (CVE-2014-0143)
dmg: prevent chunk buffer overflow (CVE-2014-0145)
dmg: sanitize chunk length and sectorcount (CVE-2014-0145)
qcow2: Fix new L1 table size check (CVE-2014-0143)
qcow2: Avoid integer overflow in get_refcount (CVE-2014-0143)
qcow2: Don't rely on free_cluster_index in alloc_refcount_block() (CVE-2014-0147)
qcow2: Validate active L1 table offset and size (CVE-2014-0144)
qcow2: Validate snapshot table offset/size (CVE-2014-0144)
qcow2: Check refcount table size (CVE-2014-0144)
qcow2: Check backing_file_offset (CVE-2014-0144)
qcow2: Check header_length (CVE-2014-0144)
curl: check data size before memcpy to local buffer.  (CVE-2014-0144)
vhdx: Bounds checking for block_size and logical_sector_size (CVE-2014-0148)
vdi: add bounds checks for blocks_in_image and disk_size header fields (CVE-2014-0144)
vpc: Validate block size (CVE-2014-0142)
vpc/vhd: add bounds check for max_table_entries and block_size (CVE-2014-0144)
bochs: Check extent_size header field (CVE-2014-0142)
bochs: Check catalog_size header field (CVE-2014-0143)
bochs: Use unsigned variables for offsets and sizes (CVE-2014-0147)
block/cloop: refuse images with bogus offsets (CVE-2014-0144)
block/cloop: refuse images with huge offsets arrays (CVE-2014-0144)
block/cloop: prevent offsets_size integer overflow (CVE-2014-0143)
block/cloop: validate block_size header field (CVE-2014-0144)

Upstream patches:
https://lists.gnu.org/archive/html/qemu-devel/2014-03/msg04994.html

Some of those issues affects wheezy and even squeeze versions of qemu
and qemu-kvm packages, and needs quite some backporting work.

Thanks,

/mjt



Reply sent to Michael Tokarev <mjt@tls.msk.ru>:
You have taken responsibility. (Sat, 05 Apr 2014 16:21:36 GMT) (full text, mbox, link).


Notification sent to Michael Tokarev <mjt@tls.msk.ru>:
Bug acknowledged by developer. (Sat, 05 Apr 2014 16:21:36 GMT) (full text, mbox, link).


Message #10 received at 742730-close@bugs.debian.org (full text, mbox, reply):

From: Michael Tokarev <mjt@tls.msk.ru>
To: 742730-close@bugs.debian.org
Subject: Bug#742730: fixed in qemu 2.0.0~rc1+dfsg-1exp
Date: Sat, 05 Apr 2014 16:20:02 +0000
Source: qemu
Source-Version: 2.0.0~rc1+dfsg-1exp

We believe that the bug you reported is fixed in the latest version of
qemu, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 742730@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Tokarev <mjt@tls.msk.ru> (supplier of updated qemu package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Sat, 05 Apr 2014 16:23:48 +0400
Source: qemu
Binary: qemu qemu-keymaps qemu-system qemu-system-common qemu-system-misc qemu-system-arm qemu-system-mips qemu-system-ppc qemu-system-sparc qemu-system-x86 qemu-user qemu-user-static qemu-utils qemu-guest-agent qemu-kvm
Architecture: source amd64 all
Version: 2.0.0~rc1+dfsg-1exp
Distribution: experimental
Urgency: low
Maintainer: Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>
Changed-By: Michael Tokarev <mjt@tls.msk.ru>
Description: 
 qemu       - fast processor emulator
 qemu-guest-agent - Guest-side qemu-system agent
 qemu-keymaps - QEMU keyboard maps
 qemu-kvm   - QEMU Full virtualization on x86 hardware (transitional package)
 qemu-system - QEMU full system emulation binaries
 qemu-system-arm - QEMU full system emulation binaries (arm)
 qemu-system-common - QEMU full system emulation binaries (common files)
 qemu-system-mips - QEMU full system emulation binaries (mips)
 qemu-system-misc - QEMU full system emulation binaries (miscelaneous)
 qemu-system-ppc - QEMU full system emulation binaries (ppc)
 qemu-system-sparc - QEMU full system emulation binaries (sparc)
 qemu-system-x86 - QEMU full system emulation binaries (x86)
 qemu-user  - QEMU user mode emulation binaries
 qemu-user-static - QEMU user mode emulation binaries (static version)
 qemu-utils - QEMU utilities
Closes: 714249 739589 742730 743235
Changes: 
 qemu (2.0.0~rc1+dfsg-1exp) experimental; urgency=low
 .
   * new upstream release candidate (2.0-rc1)
     Closes: #742730 -- image format processing issues
     Closes: #739589 -- migration format processing issues
     Closes: #743235
   * refreshed patches:
     02_kfreebsd.patch
     retry-pxe-after-efi.patch
     use-fixed-data-path.patch
   * removed patches applied upstream:
     qemu-1.7.1.diff
     address_space_translate-do-not-cross-page-boundaries.diff
     fix-smb-security-share.patch
     slirp-smb-redirect-port-445-too.patch
     implement-posix-timers.diff
     linux-user-fixed-s390x-clone-argument-order.patch
   * added bios-256k.bin symlink and bump seabios dependency to >= 1.7.4-2
   * recommend ovmf package for qemu-system-x86 to support UEFI boot
     (Closes: #714249)
   * switch from sdl1 to sdl2 (build-depend on libsdl2-dev)
   * output last 50 lines of config.log in case configure failed
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Severity set to 'important' from 'grave' Request was from <mjt@tls.msk.ru> to control@bugs.debian.org. (Wed, 30 Apr 2014 13:09:04 GMT) (full text, mbox, link).


Information forwarded to debian-bugs-dist@lists.debian.org, Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>:
Bug#742730; Package qemu, qemu-kvm. (Wed, 14 May 2014 08:09:05 GMT) (full text, mbox, link).


Acknowledgement sent to Michael Tokarev <mjt@tls.msk.ru>:
Extra info received and forwarded to list. Copy sent to Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>. (Wed, 14 May 2014 08:09:05 GMT) (full text, mbox, link).


Message #17 received at 742730@bugs.debian.org (full text, mbox, reply):

From: Michael Tokarev <mjt@tls.msk.ru>
To: 742730@bugs.debian.org
Cc: team@security.debian.org
Subject: Re: Bug#742730: image format processing issues: lack of input validation
Date: Wed, 14 May 2014 12:04:39 +0400
Control: reopen -1

There are 2 more CVEs assigned to new issues found in qcow1 format processing.
Since there's the same set of isssues, and since the relevant bug has only
been closed for -testing anyway (and needs backporting to -stable and even
maybe -oldstable), I'm adding them here.

CVE-2014-0222 Qemu: qcow1: Validate L2 table size
  Too large L2 table sizes cause unbounded allocations. Images actually
  created by qemu-img only have 512 byte or 4k L2 tables.

  To keep things consistent with cluster sizes, allow ranges between 512
  bytes and 64k (in fact, down to 1 entry = 8 bytes is technically
  working, but L2 table sizes smaller than a cluster don't make a lot of
  sense).

  This also means that the number of bytes on the virtual disk that are
  described by the same L2 table is limited to at most 8k * 64k or 2^29,
  preventively avoiding any integer overflows.

  https://lists.gnu.org/archive/html/qemu-devel/2014-05/msg02155.html


CVE-2014-0223 Qemu: qcow1: Validate image size
  A huge image size could cause s->l1_size to overflow. Make sure that
  images never require a L1 table larger than what fits in s->l1_size.

  This cannot only cause unbounded allocations, but also the allocation of
  a too small L1 table, resulting in out-of-bounds array accesses (both
  reads and writes).

  https://lists.gnu.org/archive/html/qemu-devel/2014-05/msg02156.html

This is qcow1, which is old qemu image format which is very rarely used
nowadays (if at all), but we have other exotic formats in this bug too.

So, with this in place, proposed patches for wheezy needs to be reworked,
adding the new fixes.

Thanks,

/mjt



Bug reopened Request was from Michael Tokarev <mjt@tls.msk.ru> to 742730-submit@bugs.debian.org. (Wed, 14 May 2014 08:09:05 GMT) (full text, mbox, link).


No longer marked as fixed in versions qemu/2.0.0~rc1+dfsg-1exp. Request was from Michael Tokarev <mjt@tls.msk.ru> to 742730-submit@bugs.debian.org. (Wed, 14 May 2014 08:09:06 GMT) (full text, mbox, link).


Reply sent to Michael Tokarev <mjt@tls.msk.ru>:
You have taken responsibility. (Fri, 23 May 2014 09:27:05 GMT) (full text, mbox, link).


Notification sent to Michael Tokarev <mjt@tls.msk.ru>:
Bug acknowledged by developer. (Fri, 23 May 2014 09:27:05 GMT) (full text, mbox, link).


Message #26 received at 742730-close@bugs.debian.org (full text, mbox, reply):

From: Michael Tokarev <mjt@tls.msk.ru>
To: 742730-close@bugs.debian.org
Subject: Bug#742730: fixed in qemu 2.0.0+dfsg-6
Date: Fri, 23 May 2014 09:24:09 +0000
Source: qemu
Source-Version: 2.0.0+dfsg-6

We believe that the bug you reported is fixed in the latest version of
qemu, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 742730@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Michael Tokarev <mjt@tls.msk.ru> (supplier of updated qemu package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Format: 1.8
Date: Fri, 23 May 2014 12:12:38 +0400
Source: qemu
Binary: qemu qemu-keymaps qemu-system qemu-system-common qemu-system-misc qemu-system-arm qemu-system-mips qemu-system-ppc qemu-system-sparc qemu-system-x86 qemu-user qemu-user-static qemu-user-binfmt qemu-utils qemu-guest-agent qemu-kvm
Architecture: source amd64 all
Version: 2.0.0+dfsg-6
Distribution: unstable
Urgency: medium
Maintainer: Debian QEMU Team <pkg-qemu-devel@lists.alioth.debian.org>
Changed-By: Michael Tokarev <mjt@tls.msk.ru>
Description: 
 qemu       - fast processor emulator
 qemu-guest-agent - Guest-side qemu-system agent
 qemu-keymaps - QEMU keyboard maps
 qemu-kvm   - QEMU Full virtualization on x86 hardware
 qemu-system - QEMU full system emulation binaries
 qemu-system-arm - QEMU full system emulation binaries (arm)
 qemu-system-common - QEMU full system emulation binaries (common files)
 qemu-system-mips - QEMU full system emulation binaries (mips)
 qemu-system-misc - QEMU full system emulation binaries (miscelaneous)
 qemu-system-ppc - QEMU full system emulation binaries (ppc)
 qemu-system-sparc - QEMU full system emulation binaries (sparc)
 qemu-system-x86 - QEMU full system emulation binaries (x86)
 qemu-user  - QEMU user mode emulation binaries
 qemu-user-binfmt - QEMU user mode binfmt registration
 qemu-user-static - QEMU user mode emulation binaries (static version)
 qemu-utils - QEMU utilities
Closes: 742730
Changes: 
 qemu (2.0.0+dfsg-6) unstable; urgency=medium
 .
   * build-depend on libgnutls28-dev not libgnutls-dev
   * added qcow1 block format validation patches from upstream:
    block-fmt-validation/qcow1-check-maximum-cluster-size.patch
    block-fmt-validation/qcow1-stricter-backing-file-length-check.patch
    block-fmt-validation/qcow1-validate-image-size-CVE-2014-0223.patch
    block-fmt-validation/qcow1-validate-L2-table-size-CVE-2014-0222.patch
     (Finally closes: #742730, CVE-2014-0222, CVE-2014-0223)
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Bug archived. Request was from Debbugs Internal Request <owner@bugs.debian.org> to internal_control@bugs.debian.org. (Sat, 21 Jun 2014 07:27:28 GMT) (full text, mbox, link).


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Debian bug tracking system administrator <owner@bugs.debian.org>. Last modified: Wed Jun 19 19:09:11 2019; Machine Name: buxtehude

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