Bug 1301011 (CVE-2016-1233) - CVE-2016-1233 fuse: udev rule creates world-writeable /dev/cuse
Summary: CVE-2016-1233 fuse: udev rule creates world-writeable /dev/cuse
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-1233
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: 1301012
Blocks: 1301013
TreeView+ depends on / blocked
 
Reported: 2016-01-22 10:35 UTC by Adam Mariš
Modified: 2019-09-29 13:42 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-01-25 10:00:49 UTC
Embargoed:

Attachments (Terms of Use)
Debian fix (2.01 KB, patch)
2016-01-25 09:57 UTC, Tomas Hoger 		no flags Details | Diff
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Description Adam Mariš 2016-01-22 10:35:12 UTC 
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.

Public via:

http://seclists.org/bugtraq/2016/Jan/106
https://www.debian.org/security/2016/dsa-3451
Comment 1 Adam Mariš 2016-01-22 10:35:34 UTC 
Created fuse tracking bugs for this issue:

Affects: fedora-all [bug 1301012]
Comment 2 Tomas Hoger 2016-01-25 09:57:26 UTC 
Created attachment 1117895 [details]
Debian fix

Source:
https://release.debian.org/proposed-updates/stable_diffs/fuse_2.9.3-15+deb8u2.debdiff
Comment 3 Tomas Hoger 2016-01-25 10:00:49 UTC 
There's no similar udev rule for /dev/cuse device in Red Hat Enterprise Linux and Fedora fuse packages.
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