A vulnerability exists in Slackware Linux version 7.1.
During the default installation of Slackware Linux, the /etc/shells file
is
installed with world-writable permissions. As a result, it may be possible
for local users to modify this file and effectively cause a denial of
service to users attempting to use applications which rely on the data
contained in the file.
No exploit is required.
A workaround is to remove the world-writable permissions from
the /etc/shells file:
# chmod 644 /etc/shells
This issue has been resolved in the base.tgz package in the Slackware-
current tree as of August 24, 2000.
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