Bug 1516205 – CVE-2017-16539 docker: The DefaultLinuxSpec function does not block /proc/scsi pathnames

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Bug 1516205 - (CVE-2017-16539) CVE-2017-16539 docker: The DefaultLinuxSpec function does not block /proc/scsi pathnames

Summary:	CVE-2017-16539 docker: The DefaultLinuxSpec function does not block /proc/scs...

Status:	CLOSED ERRATA

Aliases:	CVE-2017-16539

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20171103,repor...
Keywords:	Security

Depends On:
Blocks:	1510354
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Reported:	2017-11-22 04:32 EST by Andrej Nemec
Modified:	2018-07-05 23:31 EDT (History)
CC List:	13 users (show)

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Last Closed:	2018-04-17 21:27:16 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2017-11-22 04:32:00 EST

The DefaultLinuxSpec function in oci/defaults.go in Docker Moby through 17.03.2-ce does not block /proc/scsi pathnames, which allows attackers to trigger data loss (when certain older Linux kernels are used) by leveraging Docker container access to write a "scsi remove-single-device" line to /proc/scsi/scsi, aka SCSI MICDROP.

Upstream issue:

https://github.com/moby/moby/pull/35399

Upstream patch:

https://github.com/moby/moby/pull/35399/commits/a21ecdf3c8a343a7c94e4c4d01b178c87ca7aaa1

References:

https://twitter.com/ewindisch/status/926443521820774401
https://marc.info/?l=linux-scsi&m=150985062200941&w=2
https://marc.info/?l=linux-scsi&m=150985455801444&w=2

Comment 1 Antonio Murdaca 2017-11-22 06:21:55 EST

Fixed in docker-1.12.1, docker-1.13.1 and docker-1.13.1-rhel:

https://github.com/projectatomic/docker/commit/be5610ca9e4d8e123a74015482986987fe5d034d
https://github.com/projectatomic/docker/commit/584d391084d425cc99142f11d8fb738f0159ce11
https://github.com/projectatomic/docker/commit/b7e14ab1e07a0b7735e4edc0546ff253cea0af5b

Comment 2 Daniel Walsh 2017-11-22 09:10:51 EST

SELinux blocks this attack vector.

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