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

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
May 21, 1994

Discovery
Jan 01, 1994

Dates

Exploit
May 21, 1994

Solution
Unknown

Keywords

 FROOT, APAR IX44254, fruit

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 / RCS
Exploit: Exploit Public
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
10161

Manual Testing Notes

Credit
  • Pug - pugarlut.utexas.edu -

CVSSv2 Score

CVSSv2 Base Score = 10.0
Source: nvd.nist.gov | Generated: 2003-12-31 | Disagree?

Access_vector_2 Access_complexity_2 Authentication_2 Confidentiality_impact_2 Integrity_impact_2 Availability_impact_2

Blogs

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This section lists the latest news and blogs found via the daylife API (and for older items, the technorati API), which mention or otherwise discuss this vulnerability.

None found at this time

Comments

Add Comment

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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