Bug 865940 - (CVE-2012-4522) CVE-2012-4522 ruby: unintentional file creation caused by inserting an illegal NUL character
CVE-2012-4522 ruby: unintentional file creation caused by inserting an illega...
Status: CLOSED ERRATA
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=20121012,repor...
: Security
Depends On: 988686 866567 867750 904022
Blocks: 816611 865943
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Reported: 2012-10-12 17:02 EDT by Vincent Danen
Modified: 2014-09-19 02:54 EDT (History)
10 users (show)

See Also:
Fixed In Version: ruby 1.9.3p286
Doc Type: Bug Fix
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Last Closed: 2014-09-19 01:09:58 EDT
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RHEL 7.3 requirements from Atomic Host:


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Description Vincent Danen 2012-10-12 17:02:29 EDT
An upstream Ruby security notice [1] indicated that ruby suffered from a flaw where unintended files could be created if they contained a NUL characer in the file path or name.  Certain methods like IO#open did not check the filename passed to them, and just passed those strings to lower layer routines, which could lead to unintentional files being created, as demonstrated:

  p File.exists?("foo")      #=> false
  open("foo\0bar", "w") { |f| f.puts "hai" }
  p File.exists?("foo")      #=> true
  p File.exists?("foo\0bar") #=> raises ArgumentError

Upstream indicates that ruby 1.9.3 prior to patchlevel 286 is vulnerable.  An upstream patch is available [2].

[1] http://preview.ruby-lang.org/en/news/2012/10/12/poisoned-NUL-byte-vulnerability/
[2] http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=37163
Comment 2 Vincent Danen 2012-10-15 11:56:35 EDT
This was assigned the name CVE-2012-4522:

http://seclists.org/oss-sec/2012/q4/72
Comment 3 Vincent Danen 2012-10-15 11:58:10 EDT
Created ruby tracking bugs for this issue

Affects: fedora-all [bug 866567]
Comment 5 Fedora Update System 2012-10-17 23:50:15 EDT
ruby-1.9.3.286-19.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 12 Huzaifa S. Sidhpurwala 2012-10-19 03:37:13 EDT
This issue did not affect the version of ruby as shipped with Fedora-16.

This issue was fixed in Fedora-17, via the following security advisory:

https://admin.fedoraproject.org/updates/FEDORA-2012-16086/ruby-1.9.3.286-18.fc17
Comment 13 Fedora Update System 2012-10-21 21:59:23 EDT
ruby-1.9.3.286-18.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 14 errata-xmlrpc 2013-01-08 00:08:59 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2013:0129 https://rhn.redhat.com/errata/RHSA-2013-0129.html
Comment 16 Huzaifa S. Sidhpurwala 2013-01-08 04:21:45 EST
Statement:

This issue did not affect the versions of ruby as shipped with Red Hat Enterprise Linux 6.
Comment 18 errata-xmlrpc 2013-02-28 14:08:24 EST
This issue has been addressed in following products:

  RHEL 6 Version of OpenShift Enterprise

Via RHSA-2013:0582 https://rhn.redhat.com/errata/RHSA-2013-0582.html

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