6245 : OpenSSH SKEY/BSD_AUTH Challenge-Response Remote Overflow
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
42	3203	over 10 years ago	3 months ago	2 times	90%

Timeline

Disclosure Date
2002-06-26

Description

A remote overflow exists in OpenSSH with SSHv2 challenge-response authentication. OpenSSH fails to correctly check integer boundaries in the challenge-response authentication when OpenSSH is using SKEY or BSD_AUTH authentication, resulting in an integer overflow. With a specially crafted request, an attacker can cause the sshd daemon to execute arbitrary code on this host, resulting in a loss of confidentiality, integrity, and/or availability.

Classification

Location: Local Access Required, Remote / Network Access
Attack Type: Input Manipulation
Impact: Loss of Integrity
Exploit: Exploit Public

Solution

Upgrade to version 3.3 or higher, as it has been reported to fix this vulnerability. It is also possible to correct the flaw by applying the vendor-supplied patch, by disabling challenge-response authentication, or by disabling the use of SSHv2 (not recommended).

Products

OpenSSH	OpenSSH	3.0
		3.0.1
		3.0.2
		3.1
		3.2.1
		3.2.2
		3.2.3

References

Tools & Filters

	11031 14971
Snort	1810 1811 1812
	1987

Credit

Mark Dowd - Avertavertlabs.com - McAfee Avert(tm) Labs

CVSSv2 Score

CVSSv2 Base Score = 10.0
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

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