Bug 1301011 - (CVE-2016-1233) CVE-2016-1233 fuse: udev rule creates world-writeable /dev/cuse
CVE-2016-1233 fuse: udev rule creates world-writeable /dev/cuse
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1301012
Blocks: 1301013
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Reported: 2016-01-22 05:35 EST by Adam Mariš
Modified: 2016-01-25 05:05 EST (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-01-25 05:00:49 EST
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Attachments (Terms of Use)
Debian fix (2.01 KB, patch)
2016-01-25 04:57 EST, Tomas Hoger
no flags Details | Diff

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Description Adam Mariš 2016-01-22 05:35:12 EST
It was found that fuse package in Debian ships an udev rules adjusting permissions on the related /dev/cuse character device, making it world writable. This permits a local, unprivileged attacker to create an arbitrarily-named character device in /dev and modify the memory of any process that opens it and performs an ioctl on it. This in turn might allow a local, unprivileged attacker to escalate to root privileges.

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Comment 1 Adam Mariš 2016-01-22 05:35:34 EST
Created fuse tracking bugs for this issue:

Affects: fedora-all [bug 1301012]
Comment 3 Tomas Hoger 2016-01-25 05:00:49 EST
There's no similar udev rule for /dev/cuse device in Red Hat Enterprise Linux and Fedora fuse packages.

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