Bug 1561952 (CVE-2017-17742)

Summary: CVE-2017-17742 ruby: HTTP response splitting in WEBrick
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: bkearney, cbillett, ccoleman, cpelland, dajohnso, dedgar, dmcphers, gblomqui, gmccullo, gtanzill, hhorak, hhudgeon, jaruga, jfrey, jgoulding, jhardy, jorton, jprause, mtasaka, obarenbo, pvalena, roliveri, ruby-maint, simaishi, s, strzibny, tomckay, vanmeeuwen+fedora, vondruch
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: ruby 2.2.10, ruby 2.3.7, ruby 2.4.4, ruby 2.5.1 Doc Type: If docs needed, set a value
Doc Text:
It was found that WEBrick did not sanitize headers sent back to clients, resulting in a response-splitting vulnerability. An attacker, able to control the server's headers, could force WEBrick into injecting additional headers to a client.
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-10 10:19:11 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1561956, 1561957, 1561958, 1563873, 1563874, 1565258, 1567035, 1567036, 1567037, 1567038, 1567039, 1651798, 1652037, 1652038, 1802765, 1802766, 1821482    
Bug Blocks: 1561954    

Description Adam Mariš 2018-03-29 09:08:50 UTC
If a script accepts an external input and outputs it without modification as a part of HTTP responses, an attacker can use newline characters to deceive the clients that the HTTP response header is stopped at there, and can inject fake HTTP responses after the newline characters to show malicious contents to the clients.

Affected versions:

Ruby 2.2 series: 2.2.9 and earlier
Ruby 2.3 series: 2.3.6 and earlier
Ruby 2.4 series: 2.4.3 and earlier
Ruby 2.5 series: 2.5.0 and earlier

External References:

https://www.ruby-lang.org/en/news/2018/03/28/http-response-splitting-in-webrick-cve-2017-17742/

Comment 1 Adam Mariš 2018-03-29 09:15:12 UTC
Created ruby tracking bugs for this issue:

Affects: fedora-all [bug 1561957]

Comment 7 Cedric Buissart 2018-04-17 10:08:18 UTC
Mitigation:

The server can manually sanitize possibly untrusted headers prior to inserting them in the reply.

Comment 8 Andrej Nemec 2018-05-14 15:26:51 UTC
Statement:

This issue affects the versions of ruby as shipped with Red Hat CloudForms 4. Red Hat Product Security has rated this issue as having security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

This issue affects the versions of ruby as shipped with Red Hat Subscription Asset Manager 1. Red Hat Product Security has rated this issue as having security impact of Moderate. A future update may address this issue. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 9 Jun Aruga 2018-11-15 15:18:21 UTC
> Affected versions:

Upstream patch:

trunk
https://github.com/ruby/ruby/commit/d9d4a28f1cdd05a0e8dabb36d747d40bbcc30f16

> Ruby 2.2 series: 2.2.9 and earlier

Backport to Ruby 2.2.
On ruby_2_2 branch
https://github.com/ruby/ruby/commit/bbda1a027475bf7ce5e1a9583a7b55d0be71c8fe

> Ruby 2.3 series: 2.3.6 and earlier
> Ruby 2.4 series: 2.4.3 and earlier
> Ruby 2.5 series: 2.5.0 and earlier

Check ruby_2_X branches searching by "webrick: prevent response splitting and header injection".

Comment 12 errata-xmlrpc 2018-11-29 09:56:45 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-2018:3729 https://access.redhat.com/errata/RHSA-2018:3729

Comment 13 errata-xmlrpc 2018-11-29 10:11:30 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-2018:3730 https://access.redhat.com/errata/RHSA-2018:3730

Comment 14 errata-xmlrpc 2018-11-29 10:22:33 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 7.4 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-2018:3731 https://access.redhat.com/errata/RHSA-2018:3731

Comment 15 errata-xmlrpc 2019-08-06 12:03:53 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2019:2028 https://access.redhat.com/errata/RHSA-2019:2028

Comment 18 errata-xmlrpc 2020-04-29 10:06:50 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.5 Extended Update Support

Via RHSA-2020:1963 https://access.redhat.com/errata/RHSA-2020:1963

Comment 19 errata-xmlrpc 2020-05-19 14:41:07 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.4 Advanced Update Support
  Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions
  Red Hat Enterprise Linux 7.4 Telco Extended Update Support

Via RHSA-2020:2212 https://access.redhat.com/errata/RHSA-2020:2212

Comment 20 errata-xmlrpc 2020-05-26 11:16:53 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.6 Extended Update Support

Via RHSA-2020:2288 https://access.redhat.com/errata/RHSA-2020:2288