OVMSA-2016-0172 - xen security update
| Type: | SECURITY |
| Severity: | IMPORTANT |
| Release Date: | 2016-12-07 |
Description
[4.1.3-25.el5.223.45]
- 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 25149333] {CVE-2016-9637}
Related CVEs
Updated Packages
| Release/Architecture | Filename | MD5sum | Superseded By Advisory |
|
| Oracle VM 3.2 (x86_64) | xen-4.1.3-25.el5.223.45.src.rpm | 7fddcce6375012eadde45e110cd3558c | OVMSA-2021-0014 |
| xen-4.1.3-25.el5.223.45.x86_64.rpm | 3e8be1089b58b2954c24b894964f1ffd | OVMSA-2021-0014 |
| xen-devel-4.1.3-25.el5.223.45.x86_64.rpm | 56d3f2edd0eeb7ba19ccd6e350e2131b | OVMSA-2019-0048 |
| xen-tools-4.1.3-25.el5.223.45.x86_64.rpm | c46935fd9c0a573317ce6c2997d77b42 | OVMSA-2021-0014 |
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