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FreeBSD-SA-01:21                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:          ja-elvis and ko-helvis ports contain a local
                root compromise

Category:       ports
Module:         ja-elvis/ko-helvis
Announced:      2001-02-07
Credits:        Found during internal auditing
Affects:        Ports collection prior to the correction date.
Corrected:      2001-01-28
Vendor status:  Vendor notified
FreeBSD only:   No

I.   Background

The ja-elvis and ko-helvis ports are localized versions of elvis,
a vi editor clone.

II.  Problem Description

The ja-elvis and ko-helvis ports, versions prior to ja-elvis-1.8.4_1
and ko-helvis-1.8h2_1, contain an exploitable buffer overflow in the
elvrec utility.  Because elvrec is setuid root, unprivileged local
users may gain root privileges on the local system.

The ja-elvis and ko-helvis ports are not installed by default, nor
are they "part of FreeBSD" as such: they are part of the FreeBSD
ports collection, which contains over 4500 third-party applications
in a ready-to-install format.  The ports collections shipped with
FreeBSD 3.5.1 and 4.2 contain this problem since it was discovered
after the releases.

FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.

III. Impact

Unprivileged local users may gain root privileges on the local
system.

If you have not chosen to install the ja-elvis or ko-helvis
ports/packages, then your system is not vulnerable to this problem.

IV.  Workaround

Deinstall the ja-elvis or ko-helvis port/package, if you have
installed it.

V.   Solution

One of the following:

1) Upgrade your entire ports collection and rebuild the ja-elvis or
ko-helvis port.

2) Deinstall the old package and install a new package dated after the
correction date, obtained from:

[i386]

[ja-elvis]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/japanese/ja-elvis-1.8.4_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/japanese/ja-elvis-1.8.4_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/japanese/ja-elvis-1.8.4_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/japanese/ja-elvis-1.8.4_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/japanese/ja-elvis-1.8.4_1.tgz

[ko-helvis]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/korean/ko-helvis-1.8h2_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/korean/ko-helvis-1.8h2_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/korean/ko-helvis-1.8h2_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/korean/ko-helvis-1.8h2_1.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/korean/ko-helvis-1.8h2_1.tgz

[alpha]
Packages are not automatically generated for the alpha architecture at
this time due to lack of build resources.

3) download a new port skeleton for the ja-elvis or ko-helvis port
from:

http://www.freebsd.org/ports/

and use it to rebuild the port.

4) Use the portcheckout utility to automate option (3) above. The
portcheckout port is available in /usr/ports/devel/portcheckout or the
package can be obtained from:

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz


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