OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1016931 |
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SecurityTracker URL: http://securitytracker.com/id/1016931
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CVE Reference:
CVE-2006-4924
(Links to External Site)
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Updated: Sep 28 2006
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Original Entry Date: Sep 26 2006
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Impact:
Denial of service via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 4.3 and prior versions
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Description:
A vulnerability was reported in OpenSSH. A remote user can cause denial of service conditions.
A remote user can cause the target OpenSSH service to consume excessive CPU resources when SSH protocol version 1 is enabled.
The flaw resides in the CRC attack detection function in the processing of identical blocks.
Tavis Ormandy of the Google Security Team discovered this vulnerability.
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Impact:
A remote user can cause the target service to consume excessive CPU resources.
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Solution:
The vendor has issued a fixed version (4.4).
The vendor has also issued the following source code fixes:
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/deattack.c.diff?r1=1.29&r2=1.30&sortby=date&f=h
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/packet.c.diff?r1=1.143&r2=1.144&sortby=date&f=h
http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/deattack.h.diff?r1=1.9&r2=1.10&sortby=date&f=h
The OpenSSH advisory is available at:
http://www.openssh.org/txt/release-4.4
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Vendor URL: www.openssh.org/ (Links to External Site)
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Cause:
State error
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Underlying OS:
Linux (Any), UNIX (Any)
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Tue, 26 Sep 2006 08:28:47 -0400
Subject: CVE-2006-4924 openssh DoS
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https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207955
CVE-2006-4924
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