Bug 1905632 (CVE-2020-29481) - CVE-2020-29481 xen: Xenstore: new domains inheriting existing node permissions (XSA-322)
Summary: CVE-2020-29481 xen: Xenstore: new domains inheriting existing node permission...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-29481
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: 1908095
Blocks: 1903644
TreeView+ depends on / blocked
 
Reported: 2020-12-08 17:27 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-02-16 18:46 UTC (History)
4 users (show)

Fixed In Version:
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Last Closed: 2020-12-15 22:19:42 UTC


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Description Guilherme de Almeida Suckevicz 2020-12-08 17:27:56 UTC
Access rights of Xenstore nodes are per domid.  Unfortunately, existing granted access rights are not removed when a domain is destroyed.  This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. All Xenstore entries of a guest below /local/domain/<domid> are deleted by Xen tools when a guest is destroyed.  Therefore only entries belonging to other guests, referring to the deleted guests, are potentially affected.

Comment 1 Guilherme de Almeida Suckevicz 2020-12-15 20:04:52 UTC
External References:

https://www.openwall.com/lists/oss-security/2020/12/15/3

Comment 2 Guilherme de Almeida Suckevicz 2020-12-15 20:05:41 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1908095]

Comment 3 Product Security DevOps Team 2020-12-15 22:19:42 UTC
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.


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