[Bug 2060] New: sshd tries to use chdir to users home directory as root

bugzilla-daemon at mindrot.org bugzilla-daemon at mindrot.org
Fri Jan 11 09:31:38 EST 2013


            Bug ID: 2060
           Summary: sshd tries to use chdir to users home directory as
    Classification: Unclassified
           Product: Portable OpenSSH
           Version: 6.1p1
          Hardware: Sparc
                OS: Solaris
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: metadalek at gmail.com

The chdir in session.c around line 1736 appears to be performed while
sshd is running as the root user. This fails on systems where root does
not have access to the users home directory. Examples are NFS mounted
directories where the client machine does not have root trust (root
user is mapped to nobody etc).

I think sshd should either change uid to the target user before this
segment of code is executed and maintain euid root or vice versa. 

I will experiment with a fix myself.

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