[UNIX] Linux Distributions are Vulnerable to the /bin/login Overflow

From: support@securiteam.com
Date: 12/20/01


From: support@securiteam.com
To: list@securiteam.com
Date: Thu, 20 Dec 2001 10:00:15 +0100 (CET)

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  Linux Distributions are Vulnerable to the /bin/login Overflow
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SUMMARY

It seems that while Redhat Linux and Caldera Linux distributions are
immune to the recent /bin/login environment overflow, other Linux
distributions are not. Several Linux distributions install /bin/login with
SysV login options enabled.

DETAILS

Vulnerable systems:
Slackware 8.0
Slackware 4.0
Slackware 3.3
SuSE 6.1

Immune systems:
RedHat
Caldera

Verification:
A quick way to check for SysV option capabilities is to type "login", then
enter "root testenv1=test" at the login: prompt. Supply your root passwd,
and look for "testenv1" in the output of set. If it is set, then your copy
of /bin/login supports SysV options, and is probably vulnerable.

ADDITIONAL INFORMATION

The information has been provided by <mailto:a_rager@yahoo.com> Anton
Rager.

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