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Linux Kernel Route Cache Flooding Denial of Service
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Secunia Advisory:
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SA8786
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Release Date:
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2003-05-15
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Last Update:
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2004-12-22
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Popularity:
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20,850 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| OS: | Linux Kernel 2.4.x
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Secunia CVSS-2 Score:
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| Advisory Content (Page 1 of 3) | [ 1 ] [ 2 ] [ 3 ] | |
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Description:
A vulnerability has been reported in the Linux Kernel, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to the way the kernel handles caching of routing information. By flooding a Linux system with packets with spoofed source addresses, the handling of the cache will consume large amounts of CPU resources.
This can potentially bring a Linux system offline with a rate of only 400 packets/second by using carefully chosen source addresses that causes hash collisions in the table.
A DoS can still be performed, if the system uses iptables (netfilter) to filter traffic. This is even possible with randomly chosen IP addresses that don't cause a hash collision, since it just requires a higher rate of packets.
For further details about how this feature back-fired, see "Other References".
Change Page:
[ 1 ] [ 2 ] [ 3 ]
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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