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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Xen Security Advisory 206 - xenstore denial of service via repeated update
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Xen Security Advisory XSA-206
version 9
xenstore denial of service via repeated update
UPDATES IN VERSION 9
====================
More exhaustive testing discovered a further bug in the oxenstored
patches: if no transactions are performed (ie, only atomic writes),
the new in-memory history record can grow without bound. This means
that an attacker could be able to render oxenstored slow and
eventually unuseable, and/or run dom0 out of memory. Running any
transaction (even one which aborts) will clear the history, so
periodically running the command
xenstore-write /xsa206-v7-leak 1 /xsa206-v7-leak 2
will mitigate the problem.
This bug is fixed in the new final patch attached to this version,
"oxenstored: trim history in the frequent_ops function"
The other patches remain unchanged.
ISSUE DESCRIPTION
=================
xenstored supports transactions, such that if writes which would
invalidate assumptions of a transaction occur, the entire transaction
fails. Typical response on a failed transaction is to simply retry
the transaction until it succeeds.
Unprivileged domains may issue writes to xenstore which conflict with
transactions either of the toolstack or of backends such as the driver
domain. Depending on the exact timing, repeated writes may cause
transactions made by these entities to fail indefinitely.
IMPACT
======
Unprivileged guests may be able to stall progress of the control
domain or driver domain, possibly leading to a Denial of Service (DoS)
of the entire host.
In most systems, the impact is limited to the delay or prevention of
control operations (such as domain creation, reconfiguration,
configuration enquiry, or destruction).
VULNERABLE SYSTEMS
==================
All Xen versions are vulnerable.
Both "cxenstored" (the version of xenstored written in C) and
"oxenstored" (the version of xenstored written in ocaml) are
vulnerable. oxenstored in Xen 4.7 and later is more difficult to
exploit because it has more fine-grained detection of conflicts.
MITIGATION
==========
If the rogue domain(s) can be identified, it will usually be possible
to pause them with "xl pause" and/or destroy them with "xl destroy".
Note that if the toolstack is not simply "xl", the toolstack may be
confused by use of "xl" to pause or destroy domains.
The output of commands such as "xl top" and "xenstore-ls -fp" may be
helpful to find the rogue domain(s).
When the rogue domain(s) are paused or destroyed, the stuck operations
will become unstuck.
CREDITS
=======
This issue was discovered by Jürgen Groß of SUSE.
RESOLUTION
==========
Applying the appropriate attached patches resolves this issue by
limiting the rate at which it is possible to invalidate transactions.
C xenstored
- -----------
Only the first of the patches is strictly necessary to solve the
issue; the second patch adds logging for when the situation occurs, so
may be useful in detecting attacks or debugging issues.
ocaml xenstored
- ---------------
The oxenstored patches depend on some patches to reduce false
conflicts in transactions that were introduced in Xen 4.7. The
patches for 4.4-4.6 include backported versions of these patches in
addition to backported versions of the ratelimiting patches.
Xen 4.4 requires some further backports in order to allow the
ratelimiting patches to apply cleanly without significant reworking.
These have been kept to a minimum.
Identification of patch files
- -----------------------------
The patch number ranges are:
xen-unstable, 4.8, and 4.7:
0001-0002: cxenstored
0003-0016: oxenstored ratelimiting
4.6, 4.5:
0001-0002: cxenstored
0003-0010: oxenstored avoidance of needless conflicts
0011-0024: oxenstored ratelimiting
4.4:
0001-0002: cxenstored
0003-0009: oxenstored further prerequisites
0009-0017: oxenstored avoidance of needless conflicts
0018-0031: oxenstored ratelimiting
xsa206-unstable/*.patch xen-unstable
xsa206-4.8/*.patch xen-4.8
xsa206-4.7/*.patch xen-4.7
xsa206-4.6/*.patch xen-4.6
xsa206-4.5/*.patch xen-4.5
xsa206-4.4/*.patch xen-4.4
$ sha256sum xsa206*/*
9a4854117c15f1994f4398b0db24c771143766e759c23b332ddef0c65d6f6214
xsa206-unstable/0001-xenstored-apply-a-write-transaction-rate-limit.patch
6b9bce3d231fcd43b8f6a23f9da4a11a8bf9991009e89b1b1be9e22f358b3676
xsa206-unstable/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
2e7a3e79188a2477054ccd9146a877ce4cf35679e846f279030775ba5905a825
xsa206-unstable/0003-oxenstored-comments-explaining-some-variables.patch
bdde472ebbdd9e8654a8e5c5881723adefeb6cd217b2e73810cb99c7404763a1
xsa206-unstable/0004-oxenstored-handling-of-domain-conflict-credit.patch
cfd1b2ef7d37666b99b5b95d317650d856af087d2588bb76b4e3c74b44e82f0c
xsa206-unstable/0005-oxenstored-ignore-domains-with-no-conflict-credit.patch
8dcf3f3232116ab4611ae7016a749280ee2d4fe750de20db2bce458fbc8ff5d5
xsa206-unstable/0006-oxenstored-add-transaction-info-relevant-to-history-.patch
c65c6d4e02d9e06db1667334f6006c5d9935824f927cab30852b3c8d1bdc6209
xsa206-unstable/0007-oxenstored-support-commit-history-tracking.patch
1266f764156b5f7d694c77d76457653ce8003dab155fd61db7e1a26eebc27d78
xsa206-unstable/0008-oxenstored-only-record-operations-with-side-effects-.patch
93f4b6aa2396d51e91b3c817dc582ea028d6c273732ace795c64154b9a498cf3
xsa206-unstable/0009-oxenstored-discard-old-commit-history-on-txn-end.patch
7c9472d6ffb4c1fe3d368d407bb214a0c5eec7b67d717288a6a3866af9ed67b1
xsa206-unstable/0010-oxenstored-track-commit-history.patch
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xsa206-unstable/0011-oxenstored-blame-the-connection-that-caused-a-transa.patch
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xsa206-unstable/0012-oxenstored-allow-self-conflicts.patch
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xsa206-unstable/0013-oxenstored-do-not-commit-read-only-transactions.patch
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xsa206-unstable/0014-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
aa7d38f2bb373fcb96cf5c834f35687cc8781f6bbe0f34af3bd7207d411352f4
xsa206-unstable/0015-oxenstored-transaction-conflicts-improve-logging.patch
9fb5551d3b18bd3c0d7760b92b581ca9207aca6fd9ef23feeee9a279b2fcf470
xsa206-unstable/0016-oxenstored-trim-history-in-the-frequent_ops-function.patch
04658b55b68d6ad783a362e815180f2a56a5d554125dde6fae69410475e1e889
xsa206-4.4/0001-xenstored-apply-a-write-transaction-rate-limit.patch
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xsa206-4.4/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
52a3f1e9c61e648fb3c673a4c3ae93118e5e9086290a3f3ccc977424d455eaee
xsa206-4.4/0003-oxenstored-exempt-dom0-from-domU-node-quotas.patch
ba1f3f9f36401939c6757f53f9c91222287edcbd52275f3d428152600b7529ef
xsa206-4.4/0004-oxenstored-perform-a-3-way-merge-of-the-quota-after-.patch
29afc8bf1ba4e18d64c873bac2d92482513eba8dc9c39418b97cb0a44edc4d27
xsa206-4.4/0005-oxenstored-catch-the-error-when-a-connection-is-alre.patch
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xsa206-4.4/0006-oxenstored-use-hash-table-to-store-socket-connection.patch
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xsa206-4.4/0007-oxenstored-enable-domain-connection-indexing-based-o.patch
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xsa206-4.4/0008-oxenstored-only-process-domain-connections-that-noti.patch
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xsa206-4.4/0009-oxenstored-add-a-safe-net-mechanism-for-existing-ill.patch
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xsa206-4.4/0010-oxenstored-refactor-putting-response-on-wire.patch
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xsa206-4.4/0011-oxenstored-remove-some-unused-parameters.patch
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xsa206-4.4/0012-oxenstored-refactor-request-processing.patch
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xsa206-4.4/0013-oxenstored-keep-track-of-each-transaction-s-operatio.patch
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xsa206-4.4/0014-oxenstored-move-functions-that-process-simple-operat.patch
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xsa206-4.4/0015-oxenstored-replay-transaction-upon-conflict.patch
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xsa206-4.4/0019-oxenstored-handling-of-domain-conflict-credit.patch
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xsa206-4.4/0020-oxenstored-ignore-domains-with-no-conflict-credit.patch
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xsa206-4.4/0021-oxenstored-add-transaction-info-relevant-to-history-.patch
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xsa206-4.4/0022-oxenstored-support-commit-history-tracking.patch
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xsa206-4.4/0023-oxenstored-only-record-operations-with-side-effects-.patch
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xsa206-4.4/0025-oxenstored-track-commit-history.patch
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xsa206-4.4/0026-oxenstored-blame-the-connection-that-caused-a-transa.patch
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$
DEPLOYMENT DURING EMBARGO
=========================
Deployment of the patches and/or mitigations described above (or
others which are substantially similar) is permitted during the
embargo, even on public-facing systems with untrusted guest users and
administrators.
But: Distribution of updated software is prohibited (except to other
members of the predisclosure list).
Predisclosure list members who wish to deploy significantly different
patches and/or mitigations, please contact the Xen Project Security
Team.
(Note: this during-embargo deployment notice is retained in
post-embargo publicly released Xen Project advisories, even though it
is then no longer applicable. This is to enable the community to have
oversight of the Xen Project Security Team's decisionmaking.)
For more information about permissible uses of embargoed information,
consult the Xen Project community's agreed Security Policy:
http://www.xenproject.org/security-policy.html
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xsa206-4.8/0016-oxenstored-trim-history-in-the-frequent_ops-function.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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