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Bug 1542207 - (CVE-2018-6560) CVE-2018-6560 flatpak: sandbox escape in D-Bus filtering by a crafted authentication handshake
CVE-2018-6560 flatpak: sandbox escape in D-Bus filtering by a crafted authent...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20180129,repor...
: Security
Depends On: 1547003 1547376 1547377
Blocks: 1542208
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Reported: 2018-02-05 15:21 EST by Laura Pardo
Modified: 2018-09-25 15:07 EDT (History)
3 users (show)

See Also:
Fixed In Version: flatpak 0.8.9, flatpak 0.10.3
Doc Type: If docs needed, set a value
Doc Text:
It was found that flatpak's D-Bus proxy did not properly filter the access to D-Bus during the authentication protocol. A specially crafted flatpak application could use this flaw to bypass all restrictions imposed by flatpak and have full access to the D-BUS interface.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:2766 None None None 2018-09-25 15:07 EDT

  None (edit)
Description Laura Pardo 2018-02-05 15:21:19 EST 
A flaw was found in dbus-proxy/flatpak-proxy.c in Flatpak before 0.8.9, and 0.9.x and 0.10.x before 0.10.3, crafted. D-Bus messages to the host can be used to break out of the sandbox, because whitespace handling in the proxy is not identical to whitespace handling in the daemon.

References:
https://github.com/flatpak/flatpak/releases/tag/0.8.9
https://github.com/flatpak/flatpak/releases/tag/0.10.3

Patch:
https://github.com/flatpak/flatpak/commit/52346bf187b5a7f1c0fe9075b328b7ad6abe78f6
Comment 6 errata-xmlrpc 2018-09-25 15:07:01 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:2766 https://access.redhat.com/errata/RHSA-2018:2766
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