Bug 17552 – default RH6.2 kernel (2.2.14) accepts source routed frames

Bug 17552 - default RH6.2 kernel (2.2.14) accepts source routed frames

Summary:	default RH6.2 kernel (2.2.14) accepts source routed frames

Status:	CLOSED NOTABUG

Aliases:	None

Product:	Red Hat Linux
Classification:	Retired
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.2
Hardware:	i386 Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Michael K. Johnson
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Keywords:	Security

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Reported:	2000-09-15 16:30 EDT by jose nazario
Modified:	2008-05-01 11:37 EDT (History)
CC List:	0 users

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Doc Type:	Bug Fix
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Last Closed:	2000-09-15 16:30:46 EDT
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Description jose nazario 2000-09-15 16:30:44 EDT

the default redhat 6.2 kernel (tested on i386) accepts source routed frames. this is bad from a security standpoint because source routed 
frames are sometimes used by attackers to evade detection or hide their identity and location. the best practice is to drop source routed frames 
at the border (on the routers and firewalls) and the hosts as well. 

the offending variables live in:
/proc/sys/net/ipv4/conf/eth0/accept_source_route
/proc/sys/net/ipv4/conf/default/accept_source_route

these values should be sysctl'd to 0 to drop source routed frames.

Comment 1 Michael K. Johnson 2002-01-18 12:55:32 EST

Agreed that firewall scripts should turn this off, but this isn't a
bug in the configuration.

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