[Secure-testing-team] Bug#742730: image format processing issues: lack of input validation

[Michael Tokarev]

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