CVE-2018-18438 Qemu: Integer overflow in ccid_card_vscard_read() allows memory corruption

[P J P <ppandit () redhat com>]

  Hello,

An integer overflow issue was found in the CCID Passthru card device 
emulation, while reading card data in ccid_card_vscard_read() function. The 
ccid_card_vscard_read() function accepts a signed integer 'size' argument, 
which is subsequently used as unsigned size_t value in memcpy(), copying large 
amounts of memory.

A user inside guest could use this flaw to crash the Qemu process resulting in 
DoS.

Upstream patch:
---------------
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-10/msg02396.html
  -> https://lists.gnu.org/archive/html/qemu-devel/2018-10/msg02402.html

This issue was reported by Arash Tohidi. CVE requested via -> https://cveform.mitre.org/


Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F