Bug 1466730 (CVE-2017-9224) - CVE-2017-9224 oniguruma: Out-of-bounds stack read in match_at() during regular expression searching
Summary: CVE-2017-9224 oniguruma: Out-of-bounds stack read in match_at() during regula...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-9224
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: 1466749 1466750 1466751 1466752 1466753 1554537
Blocks: 1466748 1491035
TreeView+ depends on / blocked
 
Reported: 2017-06-30 10:48 UTC by Adam Mariš
Modified: 2020-12-14 08:59 UTC (History)
35 users (show)

Fixed In Version: oniguruma 6.3.0, php 5.6.31, php 7.0.21, php 7.1.7
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Environment:
Last Closed: 2019-06-08 03:15:48 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:1296 0 None None None 2018-05-03 05:06:49 UTC

Description Adam Mariš 2017-06-30 10:48:46 UTC 
An issue was discovered in Oniguruma 6.2.0, as used in Oniguruma-mod in Ruby through 2.4.1 and mbstring in PHP through 7.1.5. A stack out-of-bounds read occurs in match_at() during regular expression searching. A logical error involving order of validation and access in match_at() could result in an out-of-bounds read from a stack buffer.

Upstream bug:

https://github.com/kkos/oniguruma/issues/57

Upstream patch:

https://github.com/kkos/oniguruma/commit/690313a061f7a4fa614ec5cc8368b4f2284e059b
Comment 1 Adam Mariš 2017-06-30 11:34:51 UTC 
Created oniguruma tracking bugs for this issue:

Affects: epel-7 [bug 1466750]
Affects: fedora-all [bug 1466752]


Created php tracking bugs for this issue:

Affects: fedora-all [bug 1466751]


Created ruby tracking bugs for this issue:

Affects: fedora-all [bug 1466749]


Created ruby193-ruby tracking bugs for this issue:

Affects: openshift-1 [bug 1466753]
Comment 2 Doran Moppert 2017-07-31 04:04:18 UTC 
Exploiting this flaw results in a single byte read beyond the end of the input string, which is stack-allocated in the reproducer but could plausibly also be heap-allocated.  Information about the byte read may under some circumstances be leaked to the attacker, but their opportunity to control this or repeatedly exploit it to learn useful information is very small.
Comment 3 Vít Ondruch 2017-09-06 13:39:36 UTC 
This is not vulnerable according to the upstream:

~~~
> CVE-2017-9224 https://github.com/kkos/oniguruma/issues/57

not affected.

% ruby <<'END'
str   = [ 0xc7, 0xd6, 0xfe, 0xea, 0xe0, 0xe2, 0x00 ].pack('c*')
input = [0xf1, 0x5c, 0x69, 0x53, 0x53, 0x53, 0x53, 0x3c, 0x30, 0x53,
        0x59, 0x54, 0x52, 0x33, 0x7c, 0x2e, 0x5c, 0xe2, 0x48, 0x5c,
        0x7a, 0x53, 0x00, 0x06, 0x00, 0x00, 0x27, 0x19, 0x00, 0x54,
        0x52, 0x54, 0x52, 0x33, 0x7c, 0x2e, 0x53, 0xe2, 0x48].pack('c*')

re = Regexp.new(input.force_encoding('Shift_JIS'), Regexp::IGNORECASE)
re.match str.force_encoding('Shift_JIS')
END
Traceback (most recent call last):
        1: from -:8:in `<main>'
-:8:in `match': invalid byte sequence in Shift_JIS (ArgumentError)
~~~
Comment 4 Vít Ondruch 2017-09-06 13:41:09 UTC 
(In reply to Vít Ondruch from comment #3)
Speaking in Ruby context ...
Comment 6 errata-xmlrpc 2018-05-03 05:06:33 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 6
  Red Hat Software Collections for Red Hat Enterprise Linux 6.7 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.3 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS

Via RHSA-2018:1296 https://access.redhat.com/errata/RHSA-2018:1296
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