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Gentoo Linux Security Advisory GLSA 200804-03 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: OpenSSH: Privilege escalation |
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Date: April 05, 2008 |
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Bugs: #214985, #215702 |
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ID: 200804-03 |
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Synopsis |
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======== |
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|
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Two flaws have been discovered in OpenSSH which could allow local |
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attackers to escalate their privileges. |
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Background |
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========== |
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|
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OpenSSH is a complete SSH protocol implementation that includes an SFTP |
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client and server support. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-misc/openssh < 4.7_p1-r6 >= 4.7_p1-r6 |
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Description |
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=========== |
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|
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Two issues have been discovered in OpenSSH: |
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|
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* Timo Juhani Lindfors discovered that OpenSSH sets the DISPLAY |
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variable in SSH sessions using X11 forwarding even when it cannot |
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bind the X11 server to a local port in all address families |
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(CVE-2008-1483). |
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|
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* OpenSSH will execute the contents of the ".ssh/rc" file even when |
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the "ForceCommand" directive is enabled in the global sshd_config |
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(CVE-2008-1657). |
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|
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Impact |
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====== |
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|
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A local attacker could exploit the first vulnerability to hijack |
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forwarded X11 sessions of other users and possibly execute code with |
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their privileges, disclose sensitive data or cause a Denial of Service, |
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by binding a local X11 server to a port using only one address family. |
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The second vulnerability might allow local attackers to bypass intended |
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security restrictions and execute commands other than those specified |
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by "ForceCommand" if they are able to write to their home directory. |
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|
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All OpenSSH users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.7_p1-r6" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2008-1483 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1483 |
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[ 2 ] CVE-2008-1657 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1657 |
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|
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Availability |
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============ |
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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http://security.gentoo.org/glsa/glsa-200804-03.xml |
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2008 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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