Bug 1593776 – CVE-2018-10868 redhat-certification: billion laugh attack when getting the status of a host

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Bug 1593776 - (CVE-2018-10868) CVE-2018-10868 redhat-certification: billion laugh attack when getting the status of a host

Summary:	CVE-2018-10868 redhat-certification: billion laugh attack when getting the st...

Status:	NEW

Aliases:	CVE-2018-10868

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
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URL:
Whiteboard:	impact=moderate,public=20180621,repor...
Keywords:	Security

Depends On:	1608786
Blocks:	1593614
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Reported:	2018-06-21 10:48 EDT by Riccardo Schirone
Modified:	2018-08-30 03:32 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:	It has been discovered that redhat-certification does not properly limit the number of recursive definitions of entities in XML documents while parsing the status of a host. A remote attacker could use this vulnerability to consume all the memory of the server and cause a Denial of Service.
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RHEL 7.3 requirements from Atomic Host:
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Description Riccardo Schirone 2018-06-21 10:48:29 EDT

redhat-certification does not properly restrict the number of recursive definitions of entities in XML documents, allowing an unauthenticated user to run a "Billion Laugh Attack"[1] by replying to XMLRPC methods when getting the status of an host.

[1] https://en.wikipedia.org/wiki/Billion_laughs_attack

Comment 1 Riccardo Schirone 2018-06-21 10:48:38 EDT

Acknowledgments:

Name: Riccardo Schirone (Red Hat Product Security)

Comment 3 Riccardo Schirone 2018-06-25 09:12:26 EDT

getHostStatus in view.py connects to an XMLRPC server provided by the user, who could setup a fake server and reply with a small XML file which, when parsed, uses a big amount of memory.

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