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OpenSSH "X11UseLocalhost" X11 Forwarding Security Issue
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Secunia Advisory:
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SA31179
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Release Date:
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2008-07-22
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Last Update:
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2008-07-28
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Popularity:
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2,632 views
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Critical:
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Not critical
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Impact:
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Exposure of sensitive information
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Where:
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Local system
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Solution Status:
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Vendor Patch
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| Software: | OpenSSH 4.x
OpenSSH 5.x
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Subscribe:
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| CVE reference: | CVE-2008-3259
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Description:
A security issue has been reported in OpenSSH, which can be exploited by malicious, local users to disclose sensitive information.
The security issue is caused due to the sshd server setting the SO_REUSEADDR option for the listening socket used by the X11 forwarding server. This can be exploited to intercept an X11 forwarding session by binding a socket to the X11 forwarding port.
Successful exploitation requires that "X11UseLocalhost" is disabled (enabled by default) and that the underlying operating system allows the re-binding of a port without checking the effective user id or the overlapping of addresses (e.g. HP/UX).
The security issue is reported in versions prior to 5.1.
Solution:
Update to version 5.1 or 5.1p1.
Provided and/or discovered by:
The vendor credits sway2004009.
Changelog:
2008-07-28: Added CVE reference.
Original Advisory:
http://www.openssh.com/txt/release-5.1
http://openssh.com/security.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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