1007 : Multiple Unix Vendor rlogin -froot Remote Authentication Bypass
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Info

Last Modified
6 months ago

Percent Complete
100%

Disclosure
May 21, 1994

Discovery
Jan 01, 1994

Dates

Exploit
May 21, 1994

Solution
Unknown

Description

 The rlogin command of multiple Unix vendor contains a flaw that may allow a remote attacker to bypass authentication settings. The issue is triggered when using the '-froot' parameter, which allows a remote attacker to gain root access on a system without being prompted for a password resulting in a loss of integrity.

Classification

 Location: Local / Remote
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Patch
Exploit: Exploit Available
Disclosure: OSVDB Verified, Discovered in the Wild

Technical

 The flaw is a result of the way login parses its arguments as passed by rlogind. The problem is that login parses the command line option -fUSER as -f USER when using the getopt() function with the 'f:' opt string. An unauthenticated user can gain root access through rlogin by simply specifying '-froot' as a remote loginname which will be interpreted by rlogin as '-f root'.

Solution

 Contact your vendor for an appropriate patch. It is also possible to correct the flaw by implementing the following workaround: comment out the 'rlogin' line in /etc/inetd.conf and restart the inetd process.

Products
International Business Machines Corporation
Watch-list
AIX
Watch-list
 3.1.x
3.2.x
Unknown Distribution
Watch-list
Linux
Watch-list
 Unknown or Unspecified
Silicon Graphics, Inc.
Watch-list
IRIX
Watch-list
 Unknown or Unspecified

References

Tools & Filters

Nessus

 10161

Manual Testing Notes

Credit
  • Pug - pugBrand New Doo Dooarlut.utexas.edu -

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Comments

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Anonymous - 2008/01/21 15:22:34

This was reported on a very limited Linux Kernel 0.9x distribution and actively exploited at the time. However, no one seems to have documented the exact version or release (Slackware maybe?).

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