[UNIX] Linux Distributions are Vulnerable to the /bin/login Overflow
From: support@securiteam.comDate: 12/20/01
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From: support@securiteam.com To: list@securiteam.com Date: Thu, 20 Dec 2001 10:00:15 +0100 (CET)
The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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Linux Distributions are Vulnerable to the /bin/login Overflow
------------------------------------------------------------------------
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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