OpenSSH Identical Blocks Denial of Service Vulnerability - Advisories

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OpenSSH Identical Blocks Denial of Service Vulnerability

Secunia Advisory:	SA22091
Release Date:	2006-09-26
Last Update:	2006-10-05

Critical:	Moderately critical
Impact:	DoS
Where:	From remote
Solution Status:	Vendor Patch

Software:	OpenSSH 3.x OpenSSH 4.x

CVE reference:	CVE-2006-4924 (Secunia mirror)

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Description: Tavis Ormandy has reported a vulnerability in OpenSSH, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error within the handling of multiple identical blocks in a ssh packet. If ssh protocol 1 is enabled, this can be exploited to cause a DoS due to CPU consumption by sending specially crafted ssh packets. Solution: Apply patches. http://www.openbsd.org/cgi-bin/cvsweb...9&r2=1.30&sortby=date&f=h http://www.openbsd.org/cgi-bin/cvsweb...&r2=1.144&sortby=date&f=h http://www.openbsd.org/cgi-bin/cvsweb...9&r2=1.10&sortby=date&f=h Provided and/or discovered by: Tavis Ormandy, Google Security Team Changelog: 2006-10-05: Added US-CERT reference. Original Advisory: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=207955 Other References: US-CERT VU#787448: http://www.kb.cert.org/vuls/id/787448



Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise. Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.

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