Madrid, August 11, 2006 - A vulnerability has been detected in OpenSSH on Mac OS X, which could allow remote attackers to cause denial of service conditions.
Remote malicious users could try to authenticate themselves in the Open SSH server using an inexistent account to cause the service to crash. Numerous access attempts could cause a denial of service.
The attack can also be used to determine if a user account is valid or not by seeing whether the target system ceases to respond or continues to function.
This problem is resolved by installing ˝Security Update 2006-004˝ from Apple for Mac Pro, available at: http://wsidecar.apple.com/cgi-bin/nph-reg3rdpty2.pl/product=11292&cat=1&platform=osx&method=sa/SecUpd2006-004.dmg
The Apple advisory is available at: http://docs.info.apple.com/article.html?artnum=304146
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