Bug 1499825 (CVE-2017-17046, xsa245) - CVE-2017-17046 xsa245 xen: ARM: Some memory not scrubbed at boot (XSA-245)
Summary: CVE-2017-17046 xsa245 xen: ARM: Some memory not scrubbed at boot (XSA-245)
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2017-17046, xsa245
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1499843
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-10-09 12:52 UTC by Adam Mariš
Modified: 2021-02-17 01:26 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
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Clone Of:
Environment:
Last Closed: 2019-06-08 03:27:19 UTC
Embargoed:


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Description Adam Mariš 2017-10-09 12:52:01 UTC
ISSUE DESCRIPTION
=================

Data can remain readable in DRAM across soft and even hard reboots.
To ensure that sensitive data is not leaked from one domain to another
after a reboot, Xen must "scrub" all memory on boot (write it with
zeroes).

Unfortunately, it was discovered that when memory was in disjoint blocks,
or when the first block didn't begin at physical address 0, arithmetic
errors meant that some memory was not scrubbed.

IMPACT
======

Sensitive information from one domain before a reboot might be visible
to another domain after a reboot.

VULNERABLE SYSTEMS
==================

Only ARM systems are vulnerable.

All versions of Xen since 4.5 are vulnerable.

Only hardware with disjoint blocks, or physical addresses not starting at 0
are vulnerable; this includes the majority of ARM systems.

MITIGATION
==========

None.

External References:

http://xenbits.xen.org/xsa/advisory-245.html

Comment 1 Adam Mariš 2017-10-09 13:10:27 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1499843]

Comment 2 Adam Mariš 2017-11-30 13:27:40 UTC
Acknowledgments:

Name: the Xen project


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