Information

Advisory XSA-206
Public release 2017-03-28 12:00
Updated 2023-12-15 15:35
Version 10
CVE(s) none (yet) assigned
Title xenstore denial of service via repeated update

Files

advisory-206.txt (signed advisory file)
xsa206-unstable/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-unstable/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-unstable/0003-oxenstored-comments-explaining-some-variables.patch
xsa206-unstable/0004-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-unstable/0005-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-unstable/0006-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-unstable/0007-oxenstored-support-commit-history-tracking.patch
xsa206-unstable/0008-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-unstable/0009-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-unstable/0010-oxenstored-track-commit-history.patch
xsa206-unstable/0011-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-unstable/0012-oxenstored-allow-self-conflicts.patch
xsa206-unstable/0013-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-unstable/0014-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-unstable/0015-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-unstable/0016-oxenstored-trim-history-in-the-frequent_ops-function.patch
xsa206-4.4/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-4.4/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-4.4/0003-oxenstored-exempt-dom0-from-domU-node-quotas.patch
xsa206-4.4/0004-oxenstored-perform-a-3-way-merge-of-the-quota-after-.patch
xsa206-4.4/0005-oxenstored-catch-the-error-when-a-connection-is-alre.patch
xsa206-4.4/0006-oxenstored-use-hash-table-to-store-socket-connection.patch
xsa206-4.4/0007-oxenstored-enable-domain-connection-indexing-based-o.patch
xsa206-4.4/0008-oxenstored-only-process-domain-connections-that-noti.patch
xsa206-4.4/0009-oxenstored-add-a-safe-net-mechanism-for-existing-ill.patch
xsa206-4.4/0010-oxenstored-refactor-putting-response-on-wire.patch
xsa206-4.4/0011-oxenstored-remove-some-unused-parameters.patch
xsa206-4.4/0012-oxenstored-refactor-request-processing.patch
xsa206-4.4/0013-oxenstored-keep-track-of-each-transaction-s-operatio.patch
xsa206-4.4/0014-oxenstored-move-functions-that-process-simple-operat.patch
xsa206-4.4/0015-oxenstored-replay-transaction-upon-conflict.patch
xsa206-4.4/0016-oxenstored-log-request-and-response-during-transacti.patch
xsa206-4.4/0017-oxenstored-allow-compilation-prior-to-OCaml-3.12.0.patch
xsa206-4.4/0018-oxenstored-comments-explaining-some-variables.patch
xsa206-4.4/0019-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-4.4/0020-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-4.4/0021-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-4.4/0022-oxenstored-support-commit-history-tracking.patch
xsa206-4.4/0023-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-4.4/0024-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-4.4/0025-oxenstored-track-commit-history.patch
xsa206-4.4/0026-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-4.4/0027-oxenstored-allow-self-conflicts.patch
xsa206-4.4/0028-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-4.4/0029-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-4.4/0030-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-4.4/0031-oxenstored-trim-history-in-the-frequent_ops-function.patch
xsa206-4.5/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-4.5/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-4.5/0003-oxenstored-refactor-putting-response-on-wire.patch
xsa206-4.5/0004-oxenstored-remove-some-unused-parameters.patch
xsa206-4.5/0005-oxenstored-refactor-request-processing.patch
xsa206-4.5/0006-oxenstored-keep-track-of-each-transaction-s-operatio.patch
xsa206-4.5/0007-oxenstored-move-functions-that-process-simple-operat.patch
xsa206-4.5/0008-oxenstored-replay-transaction-upon-conflict.patch
xsa206-4.5/0009-oxenstored-log-request-and-response-during-transacti.patch
xsa206-4.5/0010-oxenstored-allow-compilation-prior-to-OCaml-3.12.0.patch
xsa206-4.5/0011-oxenstored-comments-explaining-some-variables.patch
xsa206-4.5/0012-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-4.5/0013-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-4.5/0014-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-4.5/0015-oxenstored-support-commit-history-tracking.patch
xsa206-4.5/0016-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-4.5/0017-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-4.5/0018-oxenstored-track-commit-history.patch
xsa206-4.5/0019-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-4.5/0020-oxenstored-allow-self-conflicts.patch
xsa206-4.5/0021-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-4.5/0022-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-4.5/0023-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-4.5/0024-oxenstored-trim-history-in-the-frequent_ops-function.patch
xsa206-4.6/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-4.6/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-4.6/0003-oxenstored-refactor-putting-response-on-wire.patch
xsa206-4.6/0004-oxenstored-remove-some-unused-parameters.patch
xsa206-4.6/0005-oxenstored-refactor-request-processing.patch
xsa206-4.6/0006-oxenstored-keep-track-of-each-transaction-s-operatio.patch
xsa206-4.6/0007-oxenstored-move-functions-that-process-simple-operat.patch
xsa206-4.6/0008-oxenstored-replay-transaction-upon-conflict.patch
xsa206-4.6/0009-oxenstored-log-request-and-response-during-transacti.patch
xsa206-4.6/0010-oxenstored-allow-compilation-prior-to-OCaml-3.12.0.patch
xsa206-4.6/0011-oxenstored-comments-explaining-some-variables.patch
xsa206-4.6/0012-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-4.6/0013-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-4.6/0014-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-4.6/0015-oxenstored-support-commit-history-tracking.patch
xsa206-4.6/0016-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-4.6/0017-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-4.6/0018-oxenstored-track-commit-history.patch
xsa206-4.6/0019-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-4.6/0020-oxenstored-allow-self-conflicts.patch
xsa206-4.6/0021-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-4.6/0022-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-4.6/0023-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-4.6/0024-oxenstored-trim-history-in-the-frequent_ops-function.patch
xsa206-4.7/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-4.7/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-4.7/0003-oxenstored-comments-explaining-some-variables.patch
xsa206-4.7/0004-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-4.7/0005-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-4.7/0006-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-4.7/0007-oxenstored-support-commit-history-tracking.patch
xsa206-4.7/0008-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-4.7/0009-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-4.7/0010-oxenstored-track-commit-history.patch
xsa206-4.7/0011-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-4.7/0012-oxenstored-allow-self-conflicts.patch
xsa206-4.7/0013-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-4.7/0014-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-4.7/0015-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-4.7/0016-oxenstored-trim-history-in-the-frequent_ops-function.patch
xsa206-4.8/0001-xenstored-apply-a-write-transaction-rate-limit.patch
xsa206-4.8/0002-xenstored-Log-when-the-write-transaction-rate-limit-.patch
xsa206-4.8/0003-oxenstored-comments-explaining-some-variables.patch
xsa206-4.8/0004-oxenstored-handling-of-domain-conflict-credit.patch
xsa206-4.8/0005-oxenstored-ignore-domains-with-no-conflict-credit.patch
xsa206-4.8/0006-oxenstored-add-transaction-info-relevant-to-history-.patch
xsa206-4.8/0007-oxenstored-support-commit-history-tracking.patch
xsa206-4.8/0008-oxenstored-only-record-operations-with-side-effects-.patch
xsa206-4.8/0009-oxenstored-discard-old-commit-history-on-txn-end.patch
xsa206-4.8/0010-oxenstored-track-commit-history.patch
xsa206-4.8/0011-oxenstored-blame-the-connection-that-caused-a-transa.patch
xsa206-4.8/0012-oxenstored-allow-self-conflicts.patch
xsa206-4.8/0013-oxenstored-do-not-commit-read-only-transactions.patch
xsa206-4.8/0014-oxenstored-don-t-wake-to-issue-no-conflict-credit.patch
xsa206-4.8/0015-oxenstored-transaction-conflicts-improve-logging.patch
xsa206-4.8/0016-oxenstored-trim-history-in-the-frequent_ops-function.patch

Advisory


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

                    Xen Security Advisory XSA-206
                              version 10

            xenstore denial of service via repeated update

UPDATES IN VERSION 10
=====================

Normalize version tags

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
f8908981d25f9e3db4b764b9175e80ea7e97ed288293daaab53e7e653100a3a2  xsa206-unstable/0011-oxenstored-blame-the-connection-that-caused-a-transa.patch
558ccbc92c7a79930571edc41490f92ca25bd2f801e980c29487a4d5c336149f  xsa206-unstable/0012-oxenstored-allow-self-conflicts.patch
f8d5ee900c945c7a402f1e3e450824cd4c935bbd8679575cf7750f1302b8b4a1  xsa206-unstable/0013-oxenstored-do-not-commit-read-only-transactions.patch
ffa38d660dcd0ba4da05740674e2fb4f252dab702cfd4a19ccd7e74d97f906aa  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
37a0f00a195da50a68e51a801c352bb37619bd29652f257f213070eca07201bf  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
79a726984b51c2a1ee0785cd2a4088c5e26cca70224130133a2f5938574f8bd3  xsa206-4.4/0006-oxenstored-use-hash-table-to-store-socket-connection.patch
203422dd170cc4d946b399e01aac90895518fa05c9ac6fdaf56dcb72f671110e  xsa206-4.4/0007-oxenstored-enable-domain-connection-indexing-based-o.patch
b3dcdbc7890e12b7529c9e7f912d3db62bf0a7f384f77d7b6976ec6c515d9247  xsa206-4.4/0008-oxenstored-only-process-domain-connections-that-noti.patch
5d811aa442eb871d737e6e3e338f288a7213fa70e7621a11810e9343dcb1ced1  xsa206-4.4/0009-oxenstored-add-a-safe-net-mechanism-for-existing-ill.patch
61c503e814bf8e9109598f7e9373d42f2663c0d70eda149505ba33803f9f4f16  xsa206-4.4/0010-oxenstored-refactor-putting-response-on-wire.patch
f2cae0c5f1d46a8261bc4b3b5fa9080d1ab86112dcb12a78a1df0dbd3144024a  xsa206-4.4/0011-oxenstored-remove-some-unused-parameters.patch
1e69cb6547bb90ea01d1cf1367318eb42543676ccaaf5dd408b3b82cc252f90a  xsa206-4.4/0012-oxenstored-refactor-request-processing.patch
e2ba9e2f57a9798d555245c3fd0d484816b4196f0a88faa8a27958fb552405c3  xsa206-4.4/0013-oxenstored-keep-track-of-each-transaction-s-operatio.patch
3d54ae0faf7e2b1f8090bfdafe2a09294fcc1a310e5949b055827628bc6a235c  xsa206-4.4/0014-oxenstored-move-functions-that-process-simple-operat.patch
8303b1116f81763b95473381d8ab3743761f10bdcb8b9e39e0b93dcaaa6768c8  xsa206-4.4/0015-oxenstored-replay-transaction-upon-conflict.patch
5cd63211b371a4e4a8067839fd114f51b0afc62a805ef22e4c13893d95bb0dc8  xsa206-4.4/0016-oxenstored-log-request-and-response-during-transacti.patch
c42a8395cfe5d9f417776de7517d27db4e46c3f9c3b9f56ef3fb465949f63c08  xsa206-4.4/0017-oxenstored-allow-compilation-prior-to-OCaml-3.12.0.patch
dd9e70e7e924f568e7d7807e2edc992c4dac1986b2b9b91226d5ac70ff028c6f  xsa206-4.4/0018-oxenstored-comments-explaining-some-variables.patch
ba2f035815b44bc8f4c4831bf1aa602ec553800aa3693fc0ca69878764c912e1  xsa206-4.4/0019-oxenstored-handling-of-domain-conflict-credit.patch
c693d3d28136a030d033b9a2017ec0a3f7a580da909034d3ac4c4188cb4cc540  xsa206-4.4/0020-oxenstored-ignore-domains-with-no-conflict-credit.patch
471e1904a453f03fee09d78f2d9ca25790e2619327b232566a06fd4f35ed3066  xsa206-4.4/0021-oxenstored-add-transaction-info-relevant-to-history-.patch
59756b7edacea62f0e283a16fd68a43cbc639ee32ac00b9519f2183d4cdfa7bc  xsa206-4.4/0022-oxenstored-support-commit-history-tracking.patch
35916183640b29a474ed87c56c784cc28716ce896471bc8ae9363b48af5fcaa4  xsa206-4.4/0023-oxenstored-only-record-operations-with-side-effects-.patch
98d17240fe7c2dc4380e9e8991abbe1f1fdfbe1cc676e52fa96fcf567d5502a6  xsa206-4.4/0024-oxenstored-discard-old-commit-history-on-txn-end.patch
6e9f0c33b555e1f69ef236e63f495a920b84022ed48ee50b1bb53f96216d3fb8  xsa206-4.4/0025-oxenstored-track-commit-history.patch
742d69846211969de623bf4c6106d09b761e6d261b138b63677fc401d2c5f3f3  xsa206-4.4/0026-oxenstored-blame-the-connection-that-caused-a-transa.patch
ede1c388e6aed671a5a6648b94ef5caf3cc6093b9c010d56ac25a61ba657557e  xsa206-4.4/0027-oxenstored-allow-self-conflicts.patch
8c0caf3c9458afb5620130c9abca6913a9e82270e7e2bebaa156a19dc72c2119  xsa206-4.4/0028-oxenstored-do-not-commit-read-only-transactions.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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Xenproject.org Security Team