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Insecure Library Loading
Moderately critical

FreeBSD SACK Handling Denial of Service

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Release Date:  2006-02-02    Views:  12,553

Secunia Advisory SA18696

Where:

From remote

Impact:

DoS

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


A vulnerability has been reported in FreeBSD, which can be exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the SACK (Selective ACKnowledgement) handling and may result in an infinite loop when not enough memory is available to handle an incoming SACK. This can be exploited by opening up a TCP connection to a vulnerable system and sending a specially crafted series of TCP packets.

Successful exploitation causes the TCP/IP stack to enter an infinite loop.


Solution:
Update FreeBSD or apply patch.

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits Scott Wood.

Original Advisory:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:08.sack.asc

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: FreeBSD SACK Handling Denial of Service

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