[<prev] [next>] [day] [month] [year] [list]
Date: Thu, 29 Jan 2015 11:15:15 +0000
From: Xen.org security team <security@....org>
To: xen-announce@...ts.xen.org, xen-devel@...ts.xen.org,
xen-users@...ts.xen.org, oss-security@...ts.openwall.com
CC: Xen.org security team <security@....org>
Subject: Xen Security Advisory 118 - arm: vgic: incorrect rate limiting of
guest triggered logging
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Xen Security Advisory XSA-118
arm: vgic: incorrect rate limiting of guest triggered logging
ISSUE DESCRIPTION
=================
On ARM systems the code which deals with virtualising the GIC
distributor would, under various circumstances, log messages on a
guest accessible code path without appropriate rate limiting.
IMPACT
======
A malicious guest could cause repeated logging to the hypervisor
console, leading to a Denial of Service attack.
VULNERABLE SYSTEMS
==================
Xen 4.4 and later systems running on ARM hardware are vulnerable.
x86 systems are not affected.
MITIGATION
==========
The problematic log messages are issued with priority Warning.
Therefore they can be rate limited by adding "loglvl=error/warning" to the
hypervisor command line or suppressed entirely by adding "loglvl=error".
NOTE REGARDING LACK OF EMBARGO
==============================
This bug was publicly reported on xen-devel, before it was appreciated
that there was a security problem.
CREDITS
=======
This issue was discovered by Julien Grall.
RESOLUTION
==========
Applying the appropriate attached patch(es) resolves this issue.
xsa118-unstable-4.5-{1,2}.patch xen-unstable, Xen 4.5.x
xsa118-4.4.patch Xen 4.4.x
$ sha256sum xsa118*.patch
5741cfe408273bd80e1a03c21a5650f963d7103fd022c688730f55dcf5373433 xsa118-4.4.patch
ee24a4c5e12b67d7539f08b644080c87797f31b4402215cd4efbbc6114bffc25 xsa118-4.5-unstable-1.patch
bd532e3cd535fcdea51f43631a519012baff068cb62d2205fc25f2c823f031eb xsa118-4.5-unstable-2.patch
$
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)
iQEcBAEBAgAGBQJUyhXoAAoJEIP+FMlX6CvZIWsH/2cK4jijgzepEboZAyIl2E8f
wWMaF6Jr28YfQz8Zcpwi4GY9BecBjm2ZUuvuHS/yPGBIvriOiZXjMtlchd3FBhjw
CTvCasqFX6DYizduAPBcph/vY2LoiYn/i74+M55I6u5g8WL/o7p3Ea3UXKg8ZdgB
PdQnLJSi4iqbO6mfdgw3lb5gfVk/DUh0rW87CoOhdPNJrQWlw9zTpfjIvrGzIDXJ
jV5eW8mBhfTE8TfuJ2cFgMZgoob709EduJ8wgLqOPMAmn1HCC/MNNtEiZhliw2yD
WQePLlXXvwXxNhHP6Ge/698unV4zPDvlCxTYjBOsZWPC1ITVhMHZ1+j3z0mXO0U=
=2kMW
-----END PGP SIGNATURE-----
Download attachment "xsa118-4.4.patch" of type "application/octet-stream" (4777 bytes)
Download attachment "xsa118-4.5-unstable-1.patch" of type "application/octet-stream" (10235 bytes)
Download attachment "xsa118-4.5-unstable-2.patch" of type "application/octet-stream" (4902 bytes)
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
