Bug 1190294 – CVE-2012-6687 fcgi: numerous connections cause segfault DoS

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Bug 1190294 - (CVE-2012-6687) CVE-2012-6687 fcgi: numerous connections cause segfault DoS

Summary:	CVE-2012-6687 fcgi: numerous connections cause segfault DoS

Status:	CLOSED NOTABUG

Aliases:	CVE-2012-6687

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:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20120714,repor...
Keywords:	Security

Depends On:	1189958 1190212
Blocks:	1190295
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Reported:	2015-02-06 17:19 EST by Kurt Seifried
Modified:	2015-08-25 01:56 EDT (History)
CC List:	5 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-08-25 01:55:47 EDT
Type:	---
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Documentation:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Launchpad	933417	None	None	None	Never
Debian BTS	933417	None	None	None	Never

Groups: None (edit)

Description Kurt Seifried 2015-02-06 17:19:48 EST

FCGI does not perform range checks for file descriptors before use of the FD_SET macro.  This FD_SET macro could allow for more than 1024 total file descriptors to be monitored in the closing state.

This may allow remote attackers to cause a denial of service (stack memory corruption, and infinite loop or daemon crash) by opening many socket connections to the host and crashing the service.

External references:
https://bugs.launchpad.net/ubuntu/+source/libfcgi/+bug/933417
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=681591

Upstream patches:

At this time the fcgi mailing list is down, this seems to be the patch that is chosen:

https://launchpadlibrarian.net/93064712/poll.patch

Comment 1 Ken Dreyer (Red Hat) 2015-02-06 17:31:22 EST

link to CVE request: http://www.openwall.com/lists/oss-security/2015/02/06/4 (thanks Till for making the request)

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