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Bug 1561950 - (CVE-2018-8777) CVE-2018-8777 ruby: DoS by large request in WEBrick
CVE-2018-8777 ruby: DoS by large request in WEBrick
Status: NEW
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=20180328,repor...
: Security
Depends On: 1568428 1568429 1568430 1568432 1561956 1561957 1561958 1563873 1563874 1565258 1568431
Blocks: 1561954
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Reported: 2018-03-29 05:08 EDT by Adam Mariš
Modified: 2018-07-17 08:34 EDT (History)
30 users (show)

See Also:
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 could be forced to use an excessive amount of memory during the processing of HTTP requests, leading to a Denial of Service. An attacker could use this flaw to send huge requests to a WEBrick application, resulting in the server running out of memory.
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Adam Mariš 2018-03-29 05:08:24 EDT 
If an attacker sends a large request which contains huge HTTP headers, WEBrick try to process it on memory, so the request causes the out-of-memory DoS attack.

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/large-request-dos-in-webrick-cve-2018-8777/
Comment 1 Adam Mariš 2018-03-29 05:14:13 EDT 
Created ruby tracking bugs for this issue:

Affects: fedora-all [bug 1561957]
Comment 8 Andrej Nemec 2018-05-14 11:26:26 EDT 
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/.
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