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CVE-2006-0883

Status Candidate

Overview

OpenSSH on FreeBSD 5.3 and 5.4, when used with OpenPAM, does not properly handle when a forked child process terminates during PAM authentication, which allows remote attackers to cause a denial of service (client connection refusal) by connecting multiple times to the SSH server, waiting for the password prompt, then disconnecting.

Related Files

FreeBSD-SA-06-09.openssh.txt
Posted Mar 3, 2006
Site freebsd.org

FreeBSD Security Advisory FreeBSD-SA-06:09.openssh - Because OpenSSH and OpenPAM have conflicting designs (one is event-driven while the other is callback-driven), it is necessary for OpenSSH to fork a child process to handle calls to the PAM framework. However, if the unprivileged child terminates while PAM authentication is under way, the parent process incorrectly believes that the PAM child also terminated. The parent process then terminates, and the PAM child is left behind. Due to the way OpenSSH performs internal accounting, these orphaned PAM children are counted as pending connections by the master OpenSSH server process. Once a certain number of orphans has accumulated, the master decides that it is overloaded and stops accepting client connections.

tags | advisory
systems | freebsd
advisories | CVE-2006-0883
SHA-256 | 012cb667b2bae94ec1b414c8de659b5091c2732abdfc4cd748a4a6a9557830cd
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