22861 : FreeBSD TCP/IP SACK Infinite Loop DoS
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
7	555	over 6 years ago	over 3 years ago	0 times	85%

Timeline

Disclosure Date
2006-02-01

Description

FreeBSD contains a flaw that may allow a remote denial of service. The issue is triggered when system memory is insufficient to permit the SACK (Selective Acknowledgement) extension to the TCP/IP protocol to properly handle an incoming selective acknowledgement. A malicious attacker can send a series of specially crafted packets to trigger this condition, resulting in a loss of availability for the platform.

Classification

Location: Remote / Network Access
Attack Type: Denial of Service
Impact: Loss of Availability
Disclosure: OSVDB Verified

Solution

Upgrade to version 5-STABLE or to the RELENG_5_4 or RELENG_5_3 security branch dated after the correction date, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the patch from FreeBSD or by implementing the following workaround:

# sysctl net.inet.tcp.sack.enable=0

Products

FreeBSD Project	FreeBSD	5.3
		5.4

References

Security Tracker: 1015566
Secunia Advisory ID: 18696
CVE ID: 2006-0433 (see also: NVD)
SCIP VulDB ID: 2021
Vendor Specific Advisory URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:08.sack.asc
Vendor Specific Solution URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-06:08/sack.patch ftp://ftp.freebsd.org/pub/FreeBSD/CERT/patches/SA-06:08/sack.patch.asc
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2006-02/0009.html

Credit

Scott Wood -

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2006-02-02 | Disagree?

Blogs

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