29152 : OpenSSH Identical Block Packet DoS
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
34	3256	over 6 years ago	3 months ago	2 times	90%

Timeline

Disclosure Date
2006-09-25

Description

OpenSSH contains a flaw that may allow a pre-authentication remote denial of service. The issue is triggered when SSH version 1 is used via an SSH packet that contains duplicate blocks, and will result in loss of availability for the service.

Classification

Location: Remote / Network Access
Attack Type: Cryptographic, Denial of Service, Input Manipulation
Impact: Loss of Availability
Exploit: Exploit Public
Disclosure: Vendor Verified

Solution

Upgrade to version 4.4 or higher, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by implementing the following workaround(s): disable SSH protocol version 1 in /etc/ssh/sshd_config

Products

OpenSSH	OpenSSH	4.3
OpenSSH	OpenSSH (portable)	4.3p1

References

Tools & Filters

Snort	17317
	22464 22468 22473 22474 22488 22731 23661 24029 24050 24051 24565 24811 24926 27365 27935 29538
	3751 3754 3947

Credit

Tavis Ormandy - tavisogoogle.com - Google Information Security Team

CVSSv2 Score

CVSSv2 Base Score = 7.8
Source: nvd.nist.gov | Generated: 2006-09-27 | Disagree?

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