Bug 1560614 (CVE-2017-15715) - CVE-2017-15715 httpd: <FilesMatch> bypass with a trailing newline in the file name
Summary: CVE-2017-15715 httpd: <FilesMatch> bypass with a trailing newline in the file...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2017-15715
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1560615 1560618 1565491 1565492 1565493
Blocks: 1560402
TreeView+ depends on / blocked
 
Reported: 2018-03-26 15:02 UTC by Adam Mariš
Modified: 2023-10-06 17:45 UTC (History)
36 users (show)

Fixed In Version: httpd 2.4.30
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Clone Of:
Environment:
Last Closed: 2019-06-10 10:18:33 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2018:3558 0 None None None 2018-11-13 08:36:19 UTC
Red Hat Product Errata RHSA-2019:0366 0 None None None 2019-02-18 16:55:44 UTC
Red Hat Product Errata RHSA-2019:0367 0 None None None 2019-02-18 16:58:25 UTC
Red Hat Product Errata RHSA-2020:3958 0 None None None 2020-09-29 20:07:23 UTC

Description Adam Mariš 2018-03-26 15:02:01 UTC 
The expression specified in <FilesMatch> could match '$' to a newline character in a malicious filename, rather than matching only the end of the filename. This could be exploited in environments where uploads of some files are externally blocked, but only by matching the trailing portion of the filename.

Versions Affected:
httpd 2.4.0 to 2.4.29

External References:

https://httpd.apache.org/security/vulnerabilities_24.html
Comment 2 Adam Mariš 2018-03-26 15:04:38 UTC 
Created httpd tracking bugs for this issue:

Affects: fedora-all [bug 1560618]
Comment 4 Huzaifa S. Sidhpurwala 2018-04-10 06:43:03 UTC 
Upstream patch:

https://svn.apache.org/viewvc?view=revision&revision=1824339

As per the upstream changelog, the following change was made for this flaw:

Configure the regular expression engine to match '$' to the end of
the input string only, excluding matching the end of any embedded 
newline characters. Behavior can be changed with new directive 
'RegexDefaultOptions'.
Comment 12 errata-xmlrpc 2018-11-13 08:36:04 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 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.4 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.5 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS

Via RHSA-2018:3558 https://access.redhat.com/errata/RHSA-2018:3558
Comment 13 errata-xmlrpc 2019-02-18 16:55:43 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Core Services

Via RHSA-2019:0366 https://access.redhat.com/errata/RHSA-2019:0366
Comment 14 errata-xmlrpc 2019-02-18 16:58:23 UTC 
This issue has been addressed in the following products:

  JBoss Core Services on RHEL 6
  JBoss Core Services on RHEL 7

Via RHSA-2019:0367 https://access.redhat.com/errata/RHSA-2019:0367
Comment 20 Cedric Buissart 2020-02-11 16:54:54 UTC 
Statement:

The "FilesMatch" directive is not enabled in the default httpd configuration as shipped with Red Hat Enterprise Linux, and needs to be explicitly enabled. Therefore this flaw has no impact on the default versions of the httpd package as shipped with Red Hat Enterprise Linux.

Red Hat Satellite 6 uses Red Hat Enterprise Linux 7's httpd package, and enables the "FilesMatch" directive. However, this is not believed to have an impact on security, as, in the context of a Satellite, no one is expected to have the ability to modify file names in the concerned directories. This is not considered as a vector for attack.
Comment 21 errata-xmlrpc 2020-09-29 20:07:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3958 https://access.redhat.com/errata/RHSA-2020:3958
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