Xen Security Advisory 326 v4 (CVE-2022-42311,CVE-2022-42312,CVE-2022-42313,CVE-2022-42314,CVE-2022-42315,CVE-2022-42316,CVE-2022-42317,CVE-2022-42318) - Xenstore: guests can let run xenstored out of memory

[Xen.org security team <security@xxxxxxx>]

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Hash: SHA256

 Xen Security Advisory 
CVE-2022-42311,CVE-2022-42312,CVE-2022-42313,CVE-2022-42314,CVE-2022-42315,CVE-2022-42316,CVE-2022-42317,CVE-2022-42318
 / XSA-326
                                                                        version 
4

         Xenstore: guests can let run xenstored out of memory

UPDATES IN VERSION 4
====================

Public release.

ISSUE DESCRIPTION
=================

Malicious guests can cause xenstored to allocate vast amounts of memory,
eventually resulting in a Denial of Service (DoS) of xenstored.

There are multiple ways how guests can cause large memory allocations
in xenstored:

- - by issuing new requests to xenstored without reading the responses,
  causing the responses to be buffered in memory

- - by causing large number of watch events to be generated via setting up
  multiple xenstore watches and then e.g. deleting many xenstore nodes
  below the watched path

- - by creating as many nodes as allowed with the maximum allowed size and
  path length in as many transactions as possible

- - by accessing many nodes inside a transaction

IMPACT
======

Unprivileged guests can cause a DoS of xenstored, resulting in the
inability to create new guests or modify the configuration of running
guests.

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

All Xen versions are vulnerable.

Both Xenstore implementations (C and Ocaml) are vulnerable.

MITIGATION
==========

There is no mitigation available.

CREDITS
=======

This issue was discovered by Julien Grall of Amazon.

RESOLUTION
==========

Applying the appropriate attached patches resolve this issue.

Note that the final oxenstored patch (7 or 8, as applicable) is limiting
the security support for oxenstored to trusted driver domains only.

C xenstored Patches 15 and 16 are not part of the XSA, but are useful
for administrators to change current xenstored quota settings and to
audit per-guest resource usage in xenstored.

Note that the patches are based on top of the patches for XSA-414 and
XSA-415. There is a subtle dependency on XSA-419, which can't be resolved
easily, so the patches of XSA-326 should always be applied together with
those of XSA-419.

Note that patches for released versions are generally prepared to
apply to the stable branches, and may not apply cleanly to the most
recent release tarball.  Downstreams are encouraged to update to the
tip of the stable branch before applying these patches.

xsa326/xsa326-xenstored-??.patch           xen-unstable
xsa326/xsa326-oxenstored-??.patch          xen-unstable
xsa326/xsa326-4.16-xenstored-??.patch      Xen 4.16.x
xsa326/xsa326-4.16-oxenstored-??.patch     Xen 4.16.x
xsa326/xsa326-4.15-xenstored-??.patch      Xen 4.15.x
xsa326/xsa326-4.15-oxenstored-??.patch     Xen 4.15.x
xsa326/xsa326-4.14-xenstored-??.patch      Xen 4.14.x
xsa326/xsa326-4.14-oxenstored-??.patch     Xen 4.14.x
xsa326/xsa326-4.13-xenstored-??.patch      Xen 4.13.x
xsa326/xsa326-4.13-oxenstored-??.patch     Xen 4.13.x

$ sha256sum xsa326* xsa326*/*
fbeb48f2137ead7e933d487b95d819b4adec29e33141655dfb40e66861f8d005  xsa326.meta
5da5e9d053a51faba9a553970d53736b333ce713793ed3cf3fefc19943a3ba3d  
xsa326/xsa326-4.13-oxenstored-01.patch
6c65b043f5a9a8963c74b22df2187be7936c1228b1dee7b3cd32ea2f207520d0  
xsa326/xsa326-4.13-oxenstored-02.patch
f04f4c29f8a63ff7f08af4d9a99b5da9c44eface3523e2dd9da7119d85445d42  
xsa326/xsa326-4.13-oxenstored-03.patch
438ddd4a5fb1b4c9bb5bc911052cbb84b3fbe2ce4c2559ec112b7e9cd6c3c436  
xsa326/xsa326-4.13-oxenstored-04.patch
e57d98b53c5b03e34a2e554097b634bbf568d9e336ee0ef7ec703d3ff153dd8a  
xsa326/xsa326-4.13-oxenstored-05.patch
0b13429993ab1bb5a2a58edeeebfc8bc50987e5d86dddfd6f7108259c31aed97  
xsa326/xsa326-4.13-oxenstored-06.patch
e5c995a8eeea776e57c9878b612f17f2d8cad2538897d8cf385a9f9570ecd076  
xsa326/xsa326-4.13-oxenstored-07.patch
247d2461b80884a1bbc063074b89beb769243f82f0de61fe0a45fb438b4a6d38  
xsa326/xsa326-4.13-oxenstored-08.patch
928c1b4d624b73fab33af936ba520402d0010956939ed4f17f42c8a476e7dd02  
xsa326/xsa326-4.13-xenstored-01.patch
4918eab37b70914a01b3277d83d56a20a877982fac8c5c9533afcdc8c16c4123  
xsa326/xsa326-4.13-xenstored-02.patch
1b2df2030bbb91729b16174026127f1a056e011814e2c0b14e6b9430c00f6c41  
xsa326/xsa326-4.13-xenstored-03.patch
e05aec57d8cdc1f3151cf6a2cfd8fdf10b9776e3ba564ff934d1dd51692c2f12  
xsa326/xsa326-4.13-xenstored-04.patch
197e76c74166fc686fd5b1faf6e025abd9a3e1019ebc7954f63d3561b50aa13c  
xsa326/xsa326-4.13-xenstored-05.patch
75dd40b36c3c8f43c8387402221caf05c7dd3b842caf88f59a5420039f63279f  
xsa326/xsa326-4.13-xenstored-06.patch
979224585e94d6ba01c8faf2ce4378993aace0057b2377a3ef65aea522912787  
xsa326/xsa326-4.13-xenstored-07.patch
ca15279f2d11ca693c1bf4f716835e029f200dab7ad07a12c5d4e9a9199d35ea  
xsa326/xsa326-4.13-xenstored-08.patch
7a041894a74bed53ed9951b62725535915398a1dd90d825514d338264b80f3cc  
xsa326/xsa326-4.13-xenstored-09.patch
19273b8a79da99ebfbe166e7eb2ec2ea4e68352d90535cc9e1ca154b6cdcab42  
xsa326/xsa326-4.13-xenstored-10.patch
4fa07eb6d5fe1d0d49c1e7ad28e106a57f5785cae3a1ff8fd81a0192f0e1ed70  
xsa326/xsa326-4.13-xenstored-11.patch
750984eee04854a09ea053213a7b3d411dc487a45056295e943ff4c5e7c8fa10  
xsa326/xsa326-4.13-xenstored-12.patch
1aa1458b82fac3b1dbf71f0ad2d8f29203e95ffc8bbe61e3f8aa0895613cb5f8  
xsa326/xsa326-4.13-xenstored-13.patch
791f86db3611e226801bf562cf93a4bcd5dd25070e65b6490d1a520e5570cda4  
xsa326/xsa326-4.13-xenstored-14.patch
e78ea12c7446a773fb670d674d40cef195bb98f2776c4b43e3737f9cb2742182  
xsa326/xsa326-4.13-xenstored-15.patch
3dc9ceed291b414931984952c9bc506e4686cf780a33cd338e1cec254831dc35  
xsa326/xsa326-4.13-xenstored-16.patch
19952c1d5a9979cea871323a14ab390e239865e1323193eb46891b365ec4ed9c  
xsa326/xsa326-4.14-oxenstored-01.patch
d29ad0d60c3fb07b0f6004bca7cb2457d88c4dd589ccf60261954905f27da982  
xsa326/xsa326-4.14-oxenstored-02.patch
124ebbbd5e240113ee0b17fd45d0b8b8ab2fa185197bee9293be109ff209cedb  
xsa326/xsa326-4.14-oxenstored-03.patch
8dc1e435dbe7b8ba439117c37e5115784942f0c9724b2976eb9b71eaaf4dacc4  
xsa326/xsa326-4.14-oxenstored-04.patch
601dd879e100eb73d13018ba7f36a9e7b1e3d1fa82e0b09ab2e9e5eb9f1d901e  
xsa326/xsa326-4.14-oxenstored-05.patch
1744a454249f2e93ca3b01442f9efe3ed699764780a58a99b23358f752d46b1c  
xsa326/xsa326-4.14-oxenstored-06.patch
54cd2c156db841c66a1081c8c66b87442bf47d7e0375a311f786527a17feada5  
xsa326/xsa326-4.14-oxenstored-07.patch
d6560f5aef9e8e28a4f9773bcc8dd89fd81be1d0a7267b6eba9e9b200c65d4df  
xsa326/xsa326-4.14-oxenstored-08.patch
981c67cad44b33660e9e0e7fb6877659da05266a31affb54916cdbf2670ae435  
xsa326/xsa326-4.14-xenstored-01.patch
0defc4dc7007d67d217de657305c9f3dce84dc8f9905fe82db5460cfdab48e8a  
xsa326/xsa326-4.14-xenstored-02.patch
3b885e855debf116585f27e5c8a9e6e77575c25b4c729b8b50a9457ea815204e  
xsa326/xsa326-4.14-xenstored-03.patch
167f178880e606f914bbd6a12cb0e6f56b4551d441d4ca4afa341978973e0fcc  
xsa326/xsa326-4.14-xenstored-04.patch
101dda8679ca2c22a0cc7c38d8701dfb6a082e7bfc67846cf48d4eb9e35bfdc9  
xsa326/xsa326-4.14-xenstored-05.patch
ad28cc050cdc76c8db6bacefe5d2084ec5ca2f0023ed6a463b9843f8a835173e  
xsa326/xsa326-4.14-xenstored-06.patch
29c234ea29713c997e4686a13c8c6ef1eaa12cc0ba6ed49e729922435e3902f3  
xsa326/xsa326-4.14-xenstored-07.patch
b20de5fd7d00218eb8f1e5014c06bc8397c6f93876a7328c61e99b010ad0814d  
xsa326/xsa326-4.14-xenstored-08.patch
c1568765f386a9d70b9fb59d532c239c7ef9af5fda544518de13f6b16806e099  
xsa326/xsa326-4.14-xenstored-09.patch
a99500c0d25f61c3bf4a29dc4c3a3d9457476c014c279267e2acea7714f5b92e  
xsa326/xsa326-4.14-xenstored-10.patch
efa8ec1b0e8ff5f3bcb951e1838641480bb67af68fa6dddeed9a6ea6af45ac7b  
xsa326/xsa326-4.14-xenstored-11.patch
fd40770a8cf1365034c76c99c26170ae23055000fbcad389ddad1b2d16426768  
xsa326/xsa326-4.14-xenstored-12.patch
905525ab516cdc5104558667810ec0de8626e495ba70d571fc4afc8159768cee  
xsa326/xsa326-4.14-xenstored-13.patch
4d1037a90a345ae71719abcacee274cbed35d05838659a0a4ab33951ee2418b5  
xsa326/xsa326-4.14-xenstored-14.patch
bea121de03b5c2e4736020264b949c66bb5c18edfc3f17c5591cb9a42499f469  
xsa326/xsa326-4.14-xenstored-15.patch
86376255e4b514ec77ce759321131271b8aa0075ac14116a7d49a36ac5debcc0  
xsa326/xsa326-4.14-xenstored-16.patch
30d14a68dcd80fb3f9d4df12aed6897c0ddce12e5155ac844a42b776611769cc  
xsa326/xsa326-4.15-oxenstored-01.patch
958e12676110ce2ad79103ac69c1b468dc792c40ebeb4a7898878d05661b865f  
xsa326/xsa326-4.15-oxenstored-02.patch
5f9bd4a0bc12db5c9bf89259f1d2ea76b28308ac6f1a74292284c45d88dadd30  
xsa326/xsa326-4.15-oxenstored-03.patch
b02baaad64ea00e3e05ab8de2b5c0bb1047792870f57c1974ae9cef43fc3201e  
xsa326/xsa326-4.15-oxenstored-04.patch
644d84f59dca4d55894ec4851c11d4fc0a15203319a9016fd5476fb4a4c43ca7  
xsa326/xsa326-4.15-oxenstored-05.patch
9a93874c9c63bd5a418160d2973517302c926cfaeaa22afab5dbe9da54399697  
xsa326/xsa326-4.15-oxenstored-06.patch
7dbf0a1d70aa943ea7b0be69d16027239d7f965e3994a95b47d8822d7b0c3d84  
xsa326/xsa326-4.15-oxenstored-07.patch
3809e21e09ff741448b3126bb2fb7979a67e430ca6d5b2a70fd22bd210ca276d  
xsa326/xsa326-4.15-oxenstored-08.patch
b05a06e5f29c97192710376ce89e80962a893827a30911087a6b883ff644cef6  
xsa326/xsa326-4.15-xenstored-01.patch
e0b3249792c03b9dd0e8820e5db9f6e08b38ea5182a60baff1d9264dcf6f1b16  
xsa326/xsa326-4.15-xenstored-02.patch
d94f34802f4ed302f44823b1a47c25792b5e1d040d3e04878a53b006339b4654  
xsa326/xsa326-4.15-xenstored-03.patch
ec414451bbec7229282e4db650b0b298d89c1881720886569b2a1210576398bd  
xsa326/xsa326-4.15-xenstored-04.patch
ab25a8817732f5e9f4dd3cb3cf2130de50dbe39d284c0ac80ce210b738a6a3fa  
xsa326/xsa326-4.15-xenstored-05.patch
a7c0151d34d7b340ccb02780dfc3267e654b4423cdfff32650577a4da519677e  
xsa326/xsa326-4.15-xenstored-06.patch
a4933e62317428fc8d8a5ba12a653613ee3e54ad89f26831736f0b12bb18d68e  
xsa326/xsa326-4.15-xenstored-07.patch
0b365ea9d0dfd2b2773b42a19826e369bb6e79c88f118ec41a80570be93d2c26  
xsa326/xsa326-4.15-xenstored-08.patch
dd04f56f28a6943a141f425ce3b45ebc370c559e33dab2db48f89d077cde24bf  
xsa326/xsa326-4.15-xenstored-09.patch
d2260693e4d94b4707459bf277c6a23f322fcd3fa58091cdac896b39a61a890f  
xsa326/xsa326-4.15-xenstored-10.patch
97dfa89180a20cc3e3d03edaf2cc48a343d4f07e7982b5ee1e4c61afa3103a6f  
xsa326/xsa326-4.15-xenstored-11.patch
acd6041a412fc584ccd9376f1e17f51cf40708ec3fa1c0ce64a9c9cdb393e727  
xsa326/xsa326-4.15-xenstored-12.patch
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xsa326/xsa326-4.15-xenstored-13.patch
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xsa326/xsa326-4.15-xenstored-14.patch
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xsa326/xsa326-4.15-xenstored-15.patch
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xsa326/xsa326-4.15-xenstored-16.patch
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xsa326/xsa326-4.16-oxenstored-01.patch
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xsa326/xsa326-4.16-oxenstored-02.patch
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xsa326/xsa326-4.16-oxenstored-03.patch
9ea1efcf2260b2170318467a1ae99e898024a3ee139b61570838115a1de8b956  
xsa326/xsa326-4.16-oxenstored-04.patch
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xsa326/xsa326-4.16-oxenstored-05.patch
5b771df5d23ecd6a66de93b6d5a5ab3821a3f57770d6a8d9473eb18f4bf1ee9c  
xsa326/xsa326-4.16-oxenstored-06.patch
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xsa326/xsa326-4.16-oxenstored-07.patch
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xsa326/xsa326-4.16-oxenstored-08.patch
a4542bd9278ac83c0e633bbff7d3f446a03b4dac70269c0f079c980d58d9a5ae  
xsa326/xsa326-4.16-xenstored-01.patch
6f7b7d523b0b085d2b7f371ec4477859212a265ae9a52f1f8c8f54e62f02a05e  
xsa326/xsa326-4.16-xenstored-02.patch
2b9a3f2e1764fedc08aa335603fe7c253e67496534a29ffae8fe6e9c1ba0ce19  
xsa326/xsa326-4.16-xenstored-03.patch
0fc9759eb7e6504b9f54090b5d249d602968df8db6de6dff32a84a9134317e72  
xsa326/xsa326-4.16-xenstored-04.patch
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xsa326/xsa326-4.16-xenstored-05.patch
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xsa326/xsa326-4.16-xenstored-06.patch
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xsa326/xsa326-4.16-xenstored-07.patch
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xsa326/xsa326-4.16-xenstored-08.patch
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xsa326/xsa326-4.16-xenstored-09.patch
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xsa326/xsa326-4.16-xenstored-10.patch
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xsa326/xsa326-4.16-xenstored-11.patch
5eec3bb81c5d3a3588bf30a754f630b3d08628c66c35a8d00823d1726591bae0  
xsa326/xsa326-4.16-xenstored-12.patch
6f484f7c237c7e92d3ff225e4732b0496a5e899de02812fedfbbcdc5712fff03  
xsa326/xsa326-4.16-xenstored-13.patch
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xsa326/xsa326-4.16-xenstored-14.patch
274708be8a5951eaaa2adb61974c3a1529c35dc1f293cc2e9d4759a2d8e20693  
xsa326/xsa326-4.16-xenstored-15.patch
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xsa326/xsa326-4.16-xenstored-16.patch
16248584282597dd5b405c8ced0d7d8ad644b68b9dbe13dbaa65ad9080fbbbc4  
xsa326/xsa326-oxenstored-01.patch
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xsa326/xsa326-oxenstored-02.patch
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xsa326/xsa326-oxenstored-03.patch
b3e383389d3743809422a4e5a364bad10249531bd64d0af2873294cb9abbcb10  
xsa326/xsa326-oxenstored-04.patch
ad9160630efefece9eb59e144e01911dc69d625acca2a5562a1640bc8823bcf0  
xsa326/xsa326-oxenstored-05.patch
4279925ed16d89d3f26ecb4a71d2215547088c8f733c4bce596e29b1916e01cf  
xsa326/xsa326-oxenstored-06.patch
de8faa4b114faef576024da5f99b7a961efd9f7de5fa6ba60160fe932af36494  
xsa326/xsa326-oxenstored-07.patch
b4582a663bf5cc8ef7ab5dccaab1e5b686da6584a5cab3339319c66726535e8e  
xsa326/xsa326-xenstored-01.patch
8a5699af6c6d0497f6b16030db31c59cf8b172c21a78d1d2d36f0c590a5f2319  
xsa326/xsa326-xenstored-02.patch
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xsa326/xsa326-xenstored-03.patch
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xsa326/xsa326-xenstored-04.patch
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xsa326/xsa326-xenstored-05.patch
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xsa326/xsa326-xenstored-06.patch
da69f7577dd38fc109e6271d583b3cd19197b6777e70191e079e2e120631d6cf  
xsa326/xsa326-xenstored-07.patch
a2ab8f1307609dcfb66abf12c82e8f273f12e1c92f05b350933a73794b02ad73  
xsa326/xsa326-xenstored-08.patch
417baecd2b6e10456ef6501619ba617e2c24a32bcad025df3f683f17334e42f9  
xsa326/xsa326-xenstored-09.patch
2ccd4bd9524971d140568d9d0cee49931bcf85596744a13ac3520e1e67c71fd8  
xsa326/xsa326-xenstored-10.patch
bf119e0c13e4f77d1029410be71987b51c48eb5bfa72c445394e2e2eea004e9c  
xsa326/xsa326-xenstored-11.patch
70dadf62eca8bd119ff84d4efdb0c863f8ddaf58e25e29ef6d3b7bc92fc2f0fa  
xsa326/xsa326-xenstored-12.patch
6fdd871d77b699fbb4df8efc18fd772131a216e9ac9387832ae66a3af6d58e07  
xsa326/xsa326-xenstored-13.patch
49a22d518921be7688cbe5dced9c842b3f0c67f678f3d113bbe5fce36a59d775  
xsa326/xsa326-xenstored-14.patch
a8ef297722bb4c5778d3e0f80ab16cdb6024cdb3a349789182d2167409cf1aa2  
xsa326/xsa326-xenstored-15.patch
bf20cd4808cba1506ed7404af050d9b05619b48d2d8eda7e166050540b8f25e2  
xsa326/xsa326-xenstored-16.patch
$

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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