Bug 1773728 (CVE-2019-16201) - CVE-2019-16201 ruby: Regular expression denial of service vulnerability of WEBrick's Digest authentication
Summary: CVE-2019-16201 ruby: Regular expression denial of service vulnerability of WE...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-16201
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: 1773729 1784828 1784829 1784830 1784831 1784832 1784833 1954946 1955049 1957125 2055233 2055242
Blocks: 1773730
TreeView+ depends on / blocked
 
Reported: 2019-11-18 19:49 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-02-21 10:11 UTC (History)
13 users (show)

Fixed In Version: ruby 2.4.8, ruby 2.5.7, ruby 2.6.5, ruby 2.7.0
Clone Of:
Environment:
Last Closed: 2021-05-26 11:32:01 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:2587 0 None None None 2021-06-29 16:03:21 UTC
Red Hat Product Errata RHSA-2021:2588 0 None None None 2021-06-29 16:04:00 UTC
Red Hat Product Errata RHSA-2022:0581 0 None None None 2022-02-21 10:10:57 UTC
Red Hat Product Errata RHSA-2022:0582 0 None None None 2022-02-21 10:11:52 UTC

Description Guilherme de Almeida Suckevicz 2019-11-18 19:49:28 UTC 
Regular expression denial of service vulnerability of WEBrick’s Digest authentication module was found. An attacker can exploit this vulnerability to cause an effective denial of service against a WEBrick service.

Reference:
https://www.ruby-lang.org/en/news/2019/10/01/webrick-regexp-digestauth-dos-cve-2019-16201/
Comment 1 Guilherme de Almeida Suckevicz 2019-11-18 19:49:48 UTC 
Created ruby tracking bugs for this issue:

Affects: fedora-all [bug 1773729]
Comment 2 Marco Benatto 2019-12-17 19:05:16 UTC 
External References:

https://www.ruby-lang.org/en/news/2019/10/01/webrick-regexp-digestauth-dos-cve-2019-16201/
Comment 3 Marco Benatto 2019-12-17 19:11:15 UTC 
Upstream patch for this issue:

https://github.com/ruby/ruby/commit/36e057e26ef2104bc2349799d6c52d22bb1c7d03

commit 36e057e26ef2104bc2349799d6c52d22bb1c7d03
Author: Nobuyoshi Nakada <nobu>
Date:   Tue Aug 13 12:14:28 2019 +0900

    Loop with String#scan without creating substrings

    Create the substrings necessary parts only, instead of cutting the
    rest of the buffer.  Also removed a useless, probable typo, regexp.
Comment 6 Marco Benatto 2019-12-18 12:36:51 UTC 
There's an issue with HTTPAuth when using AuthDigest mode in Ruby and webricks. When using DigestAuth HTTP authentication method, ruby uses a regular expression to split the session parameters in split_param_value() function. There's a flaw on the regular expression mentioned earlier which an attacker may leverage by sending a crafted message header which leads the regular expression to a heavily CPU consuming backtracking resulting in DoS.
Comment 7 errata-xmlrpc 2021-05-25 13:14:02 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.6 EUS
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

Via RHSA-2021:2104 https://access.redhat.com/errata/RHSA-2021:2104
Comment 8 Product Security DevOps Team 2021-05-26 11:32:01 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-16201
Comment 9 errata-xmlrpc 2021-06-03 11:25:49 UTC 
This issue has been addressed in the following products:

  Red Hat Software Collections for Red Hat Enterprise Linux 7
  Red Hat Software Collections for Red Hat Enterprise Linux 7.7 EUS

Via RHSA-2021:2230 https://access.redhat.com/errata/RHSA-2021:2230
Comment 10 errata-xmlrpc 2021-06-29 16:03:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:2587 https://access.redhat.com/errata/RHSA-2021:2587
Comment 11 errata-xmlrpc 2021-06-29 16:03:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:2588 https://access.redhat.com/errata/RHSA-2021:2588
Comment 12 errata-xmlrpc 2022-02-21 10:10:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.1 Update Services for SAP Solutions

Via RHSA-2022:0581 https://access.redhat.com/errata/RHSA-2022:0581
Comment 13 errata-xmlrpc 2022-02-21 10:11:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Extended Update Support

Via RHSA-2022:0582 https://access.redhat.com/errata/RHSA-2022:0582
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