(OpenBSD Issues Fix) OpenSSH SSH v1 CRC Attack Detection Implementation Lets Remote Users Deny Service
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SecurityTracker Alert ID: 1017052 |
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SecurityTracker URL: http://securitytracker.com/id/1017052
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CVE Reference:
CVE-2006-4924
(Links to External Site)
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Date: Oct 12 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:
OpenBSD has issued the following patches:
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.8/common/020_ssh2.patch
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/015_ssh.patch
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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:
UNIX (OpenBSD)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Thu, 12 Oct 2006 06:54:35 -0400
Subject: OpenBSD vulnerability
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SECURITY FIX: October 12, 2006 All architectures
Fix 2 security bugs found in OpenSSH. A pre-authenication denial of service (found by
Tavis Ormandy) that would cause sshd(8) to spin until the login grace time expired. An
unsafe signal handler (found by Mark Dowd) that is vulnerable to a race condition that
could be exploited to perform a pre-authentication denial of service. CVE-2006-4924,
CVE-2006-5051
A source code patch exists which remedies this problem.
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.9/common/015_ssh.patch
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