Bug 1301011 (CVE-2016-1233)

Summary: CVE-2016-1233 fuse: udev rule creates world-writeable /dev/cuse
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: cmaiolin, lemenkov, rwheeler, tcallawa
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2016-01-25 10:00:49 UTC Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 1301012    
Bug Blocks: 1301013    
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Description Flags
Debian fix none

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.