OVMSA-2016-0171

OVMSA-2016-0171 - xen security update

Type:SECURITY
Impact:IMPORTANT
Release Date:2016-12-07

Description


[4.3.0-55.el6.119.62]
- qemu_up: ioport_read, ioport_write: be defensive about 32-bit addresses
On x86, ioport addresses are 16-bit. That these functions take 32-bit
arguments is a mistake. Changing the argument type to 16-bit will
discard the top bits of any erroneous values from elsewhere in qemu.
Also, check just before use that the value is in range. (This turns
an ill-advised change to MAX_IOPORTS into a possible guest crash
rather than a privilege escalation vulnerability.)
And, in the Xen ioreq processor, clamp incoming ioport addresses to
16-bit values. Xen will never write >16-bit values but the guest may
have access to the ioreq ring. We want to defend the rest of the qemu
code from wrong values.
This is XSA-199.
Signed-off-by: Ian Jackson
Backported-by: Zhenzhong Duan
Reviewed-by: Boris Ostrovsky [bug 25149316] {CVE-2016-9637}

[4.3.0-55.el6.119.61]
- qemu: ioport_read, ioport_write: be defensive about 32-bit addresses
On x86, ioport addresses are 16-bit. That these functions take 32-bit
arguments is a mistake. Changing the argument type to 16-bit will
discard the top bits of any erroneous values from elsewhere in qemu.
Also, check just before use that the value is in range. (This turns
an ill-advised change to MAX_IOPORTS into a possible guest crash
rather than a privilege escalation vulnerability.)
And, in the Xen ioreq processor, clamp incoming ioport addresses to
16-bit values. Xen will never write >16-bit values but the guest may
have access to the ioreq ring. We want to defend the rest of the qemu
code from wrong values.
This is XSA-199.
Signed-off-by: Ian Jackson
Backported-by: Zhenzhong Duan
Reviewed-by: Boris Ostrovsky [bug 25149316] {CVE-2016-9637}


Related CVEs


CVE-2016-9637

Updated Packages


Release/ArchitectureFilenamesha256Superseded By AdvisoryChannel Label
Oracle VM 3.3 (x86_64) xen-4.3.0-55.el6.119.62.src.rpm8a31ac067f64c7c61a9cd4725316660f48b48ee764f31c515b258cd9cde4b896OVMBA-2024-0012ovm3_x86_64_3.3_patch
xen-4.3.0-55.el6.119.62.x86_64.rpm8f43ec734ce20389adeea6f439e62bc2872979e888601e7a6445e08c5fea713eOVMBA-2024-0012ovm3_x86_64_3.3_patch
xen-tools-4.3.0-55.el6.119.62.x86_64.rpm9218e2e6ce07bec1da766fa1a8b0ad4b9ef45ff27af7071b3a5fb758b1ce7000OVMBA-2024-0012ovm3_x86_64_3.3_patch



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