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Bug 1575472 - (CVE-2018-1120) CVE-2018-1120 kernel: fuse-backed file mmap-ed onto process cmdline arguments causes denial of service
CVE-2018-1120 kernel: fuse-backed file mmap-ed onto process cmdline arguments...
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=20180517:1700,...
: Security
Depends On: 1576338 1576339 1576340 1576341 1576342 1579541 1579542
Blocks: 1575855
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Reported: 2018-05-07 00:15 EDT by Doran Moppert
Modified: 2018-08-28 18:42 EDT (History)
49 users (show)

See Also:
Fixed In Version: kernel 4.17
Doc Type: If docs needed, set a value
Doc Text:
By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).
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Description Doran Moppert 2018-05-07 00:15:21 EDT
By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).

External references:

http://seclists.org/oss-sec/2018/q2/122

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f7ccc2ccc2e70c6054685f5e3522efa81556830
Comment 12 Adam Mariš 2018-05-16 07:17:45 EDT
Acknowledgments:

Name: Qualys Research Labs
Comment 13 Vladis Dronov 2018-05-17 17:13:09 EDT
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1579542]

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