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To: gentoo-announce@g.o, scoop@...
From: Seemant Kulleen <seemant@g.o>
Subject: [gentoo-announce] GLSA: ppp
Date: Wed Jul 31 09:31:42 2002
- -----------------------------------------------------------------------
GLSA: GENTOO LINUX SECURITY ANNOUNCEMENT
- -----------------------------------------------------------------------
PACKAGE         : ppp -- net dialup/point-to-point protocol
SUMMARY         : security vulnerability in symlink creation
DATE            : Wed Jul 31 14:29:24 UTC 2002
- -----------------------------------------------------------------------

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

- ------------------------------------------------------------------------
aliz@g.o
seemant@g.o
drobbins@g.o
- ------------------------------------------------------------------------


-- 
Seemant Kulleen
Developer and Project Co-ordinator,
Gentoo Linux					http://www.gentoo.org/~seemant
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Updated Jun 17, 2009

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