From: Seemant Kulleen <seemant@gentoo.org>
To: gentoo-announce@gentoo.org, scoop@freshmeat.net
Subject: [gentoo-dev] [gentoo-announce] GLSA: ppp
Date: Wed, 31 Jul 2002 07:29:44 -0700 [thread overview]
Message-ID: <20020731072944.1b7dfcb7.seemant@gentoo.org> (raw)
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GLSA: GENTOO LINUX SECURITY ANNOUNCEMENT
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PACKAGE : ppp -- net dialup/point-to-point protocol
SUMMARY : security vulnerability in symlink creation
DATE : Wed Jul 31 14:29:24 UTC 2002
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OVERVIEW
A race condition exists in the pppd program that may be exploited
in order to change the permissions of an arbitrary file.
DETAIL
>From the FreeBSD report:
The file specified as the tty device is opened by pppd, and the
permissions are recorded. If pppd fails to initialize the tty device in
some way (such as a failure of tcgetattr(3)), then pppd will then attempt
to restore the original permissions by calling chmod(2). The call to
chmod(2) is subject to a symlink race, so that the permissions may
`restored' on some other file.
The full advisory may be found here:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-02%3A32.pppd.asc
SOLUTION
It is recommended that all Gentoo Linux users who are running
net-dialup/ppp-2.4.1-r9 and earlier update their systems as follows.
emerge rsync
emerge ppp
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aliz@gentoo.org
seemant@gentoo.org
drobbins@gentoo.org
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--
Seemant Kulleen
Developer and Project Co-ordinator,
Gentoo Linux http://www.gentoo.org/~seemant
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