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Date: Tue, 12 Jan 2016 12:35:42 -0500 (EST)
From: cve-assign@...re.org
To: ppandit@...hat.com
Cc: cve-assign@...re.org, oss-security@...ts.openwall.com, donghai.zdh@...baba-inc.com
Subject: Re: CVE request Qemu: nvram: OOB r/w access in processing firmware configurations

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Hash: SHA256

> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg00428.html
> https://bugzilla.redhat.com/show_bug.cgi?id=1296060

> Qemu emulator built with the Firmware Configuration device emulation support
> is vulnerable to an OOB r/w access issue. It could occur while processing
> firmware configurations, if the current configuration entry value was set to
> be invalid(FW_CFG_INVALID=0xffff).
> 
> A privileged(CAP_SYS_RAWIO) user/process inside guest could use this flaw to
> crash the Qemu process instance resulting in DoS OR potentially execute
> arbitrary code with privileges of the Qemu process on the host.

>> if 's->cur_entry' is set to be invalid(FW_CFG_INVALID=0xffff)

Use CVE-2016-1714.

This is not yet available at
http://git.qemu.org/?p=qemu.git;a=history;f=hw/nvram/fw_cfg.c;hb=stable-2.3
but that may be an expected place for a later update.

Note that http://git.qemu.org/?p=qemu.git;a=blob;f=hw/nvram/fw_cfg.c
has:

  static void fw_cfg_write(FWCfgState *s, uint8_t value)
  {
      /* nothing, write support removed in QEMU v2.4+ */
  }

and has no fw_cfg_read function.

- -- 
CVE assignment team, MITRE CVE Numbering Authority
M/S M300
202 Burlington Road, Bedford, MA 01730 USA
[ PGP key available through http://cve.mitre.org/cve/request_id.html ]
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