Bug 1905626 (CVE-2020-29482) - CVE-2020-29482 xen: Xenstore: wrong path length check (XSA-323)
Summary: CVE-2020-29482 xen: Xenstore: wrong path length check (XSA-323)
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2020-29482
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1908096
Blocks: 1903644
TreeView+ depends on / blocked
 
Reported: 2020-12-08 17:16 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 22:19:39 UTC


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Description Guilherme de Almeida Suckevicz 2020-12-08 17:16:10 UTC
A guest may access xenstore paths via absolute paths containing a full pathname, or via a relative path, which implicitly includes /local/domain/$DOMID for their own domain id.  Management tools must access paths in guests' namespaces, necessarily using absolute paths. oxenstored imposes a path name limit which is applied solely to the relative or absolute path specified by the client.  Therefore, a guest can create paths in its own namespace which are too long for management tools to access.

Comment 1 Guilherme de Almeida Suckevicz 2020-12-15 20:06:51 UTC
External References:

https://www.openwall.com/lists/oss-security/2020/12/15/6

Comment 2 Guilherme de Almeida Suckevicz 2020-12-15 20:07:32 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1908096]

Comment 3 Product Security DevOps Team 2020-12-15 22:19:39 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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