OpenSSH ForceCommand directive command execution

openssh-forcecommand-command-execution (41549)

High Risk

Description:

OpenSSH could allow a local attacker to execute arbitrary commands on the system, caused by an error when using the shd_config ForceCommand directive. An attacker could exploit this vulnerability via ~/.ssh/rc to execute arbitrary commands on the system.

Platforms Affected:

• MandrakeSoft, Mandrake Linux 2007.1 X86_64
• MandrakeSoft, Mandrake Linux 2007.1
• MandrakeSoft, Mandrake Linux 2008.0 X86_64
• MandrakeSoft, Mandrake Linux 2008.0
• MandrakeSoft, Mandrake Linux 2008.1 X86_64
• MandrakeSoft, Mandrake Linux 2008.1
• OpenBSD, OpenSSH 1.2
• OpenBSD, OpenSSH 1.2.1
• OpenBSD, OpenSSH 1.2.2
• OpenBSD, OpenSSH 1.2.27
• OpenBSD, OpenSSH 1.2.3
• OpenBSD, OpenSSH 2.1
• OpenBSD, OpenSSH 2.1.1
• OpenBSD, OpenSSH 2.1.1p4
• OpenBSD, OpenSSH 2.2
• OpenBSD, OpenSSH 2.2.0p1
• OpenBSD, OpenSSH 2.3
• OpenBSD, OpenSSH 2.3.0p1
• OpenBSD, OpenSSH 2.5
• OpenBSD, OpenSSH 2.5.1
• OpenBSD, OpenSSH 2.5.1p1
• OpenBSD, OpenSSH 2.5.1p2
• OpenBSD, OpenSSH 2.5.2
• OpenBSD, OpenSSH 2.5.2p1
• OpenBSD, OpenSSH 2.5.2p2
• OpenBSD, OpenSSH 2.9
• OpenBSD, OpenSSH 2.9.9
• OpenBSD, OpenSSH 2.9.9p1
• OpenBSD, OpenSSH 2.9.9p2
• OpenBSD, OpenSSH 2.9p1
• OpenBSD, OpenSSH 2.9p2
• OpenBSD, OpenSSH 3.0
• OpenBSD, OpenSSH 3.0.1
• OpenBSD, OpenSSH 3.0.1p1
• OpenBSD, OpenSSH 3.0.2
• OpenBSD, OpenSSH 3.0.2p1
• OpenBSD, OpenSSH 3.0p1
• OpenBSD, OpenSSH 3.1
• OpenBSD, OpenSSH 3.1p1
• OpenBSD, OpenSSH 3.2
• OpenBSD, OpenSSH 3.2.2
• OpenBSD, OpenSSH 3.2.2p1
• OpenBSD, OpenSSH 3.2.3
• OpenBSD, OpenSSH 3.2.3p1
• OpenBSD, OpenSSH 3.3
• OpenBSD, OpenSSH 3.3p1
• OpenBSD, OpenSSH 3.4
• OpenBSD, OpenSSH 3.4p1
• OpenBSD, OpenSSH 3.5
• OpenBSD, OpenSSH 3.5p1
• OpenBSD, OpenSSH 3.6
• OpenBSD, OpenSSH 3.6.1
• OpenBSD, OpenSSH 3.6.1p1
• OpenBSD, OpenSSH 3.6.1p2
• OpenBSD, OpenSSH 3.7
• OpenBSD, OpenSSH 3.7.1
• OpenBSD, OpenSSH 3.7.1p1
• OpenBSD, OpenSSH 3.7.1p2
• OpenBSD, OpenSSH 3.8
• OpenBSD, OpenSSH 3.8.1
• OpenBSD, OpenSSH 3.8.1p1
• OpenBSD, OpenSSH 3.9
• OpenBSD, OpenSSH 3.9.1
• OpenBSD, OpenSSH 3.9.1p1
• OpenBSD, OpenSSH 4.0
• OpenBSD, OpenSSH 4.0p1
• OpenBSD, OpenSSH 4.1
• OpenBSD, OpenSSH 4.1p1
• OpenBSD, OpenSSH 4.2
• OpenBSD, OpenSSH 4.2p1
• OpenBSD, OpenSSH 4.3
• OpenBSD, OpenSSH 4.3p1
• OpenBSD, OpenSSH 4.3p2
• OpenBSD, OpenSSH 4.4
• OpenBSD, OpenSSH 4.4p1
• OpenBSD, OpenSSH 4.5
• OpenBSD, OpenSSH 4.5p1
• OpenBSD, OpenSSH 4.6
• OpenBSD, OpenSSH 4.6p1
• OpenBSD, OpenSSH 4.7
• OpenBSD, OpenSSH 4.7p1
• OpenBSD, OpenSSH 4.9
• Turbolinux, Turbolinux 11 Server
• Turbolinux, Turbolinux 11 Server x64 Ed

Remedy:

Upgrade to the latest version of OpenSSH (4.9 or later), available from the OpenSSH Web site. See References.

Consequences:

Gain Privileges

References:

• OpenBSD 4.3 errata , 001: SECURITY FIX: March 30, 2008 at http://www.openbsd.org/errata43.html#001_openssh.
• OpenSSH Changelog, Release 4.7, Changes since OpenSSH 4.7 at http://www.openssh.com/txt/release-4.9.
• OpenSSH Web site, OpenSSH at http://www.openssh.com.
• BID-28531: OpenSSH ForceCommand Command Execution Weakness
• CVE-2008-1657: OpenSSH 4.4 up to versions before 4.9 allows remote authenticated users to bypass the sshd_config ForceCommand directive by modifying the .ssh/rc session file.
• FrSIRT/ADV-2008-1035: OpenSSH ForceCommand Directive Security Bypass Weakness
• FrSIRT/ADV-2008-1624: IBM AIX Security Update Fixes OpenSSH Multiple Local Vulnerabilities
• MDVSA-2008:098: Updated openssh packages fix vulnerability
• SA29602: OpenSSH ForceCommand Bypass Weakness
• SA29609: OpenBSD OpenSSH ForceCommand Bypass Weakness
• SECTRACK ID: 1019733: OpenSSH Unsafe Default Configuration May Let Local Users Execute Arbitrary Commands
• SUSE-SR:2008:009: SUSE Security Summary Report

Reported:

Mar 30, 2008

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