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Re: Solaris telnet vulnberability - how many on your network?





Nate Eldredge wrote:
I have now set up a virtual Solaris 8 box to test this with root access, and it appears you are correct. When run as root, "login -f root" presents a login prompt, just like login without arguments. So it is not "supported" in the sense of having the Solaris 10 documented behavior.

I tested this as well on a Solaris 8 box. I did not get the behavior you described.

# uname -a
SunOS skyhawk 5.8 Generic_108528-29 sun4u sparc SUNW,Sun-Blade-100
# /bin/login -froot
Not on system console

As you can see, it did not prompt me for a password. Obviously the -f option is recognized and its semantics are implemented.

However telnet could not be used to exploit it in the same was a Solaris 10 was exploited.

Using "strings" to look at the getopt option list reveals that an undocumented "-a" option also exists. I don't know what it does, either. More material for the backdoor conspiracy theorists, I suppose. Fortunately there doesn't appear to be a "-nsakey" option.

As far as the -a option, it does not do anything. The OpenSolaris source says:

case 'a':
   break;

I'm guessing that this behavior is left over from the older versions of Solaris.


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