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AUSCERT External Security Bulletin Redistribution
ESB-2002.132 -- FreeBSD-SA-02:17.mod_frontpage
mod_frontpage port contains exploitable buffer overflow
13 March 2002
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AusCERT Security Bulletin Summary
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Product: mod_frontpage
Vendor: FreeBSD Ports Collection
Operating System: FreeBSD
Linux
UNIX
Platform: i386
Impact: Root Compromise
Access Required: Existing Account
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FreeBSD-SA-02:17 Security Advisory
FreeBSD, Inc.
Topic: mod_frontpage port contains exploitable buffer overflow
Category: ports
Module: mod_frontpage
Announced: 2002-03-12
Credits: Martin Blapp <mbr@freebsd.org>
Affects: mod_frontpage port prior to version mod_portname-1.6.1
Corrected: 2002-02-05 16:18:42 2002 UTC
FreeBSD only: NO
I. Background
mod_frontpage is a replacecement for Microsoft's frontpage apache
patch to support FP extensions. It is installed as a DSO module.
II. Problem Description
Affected versions of the mod_frontpage port contains several
exploitable buffer overflows in the fpexec wrapper, which is installed
setuid root.
The mod_frontpage port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 6000 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.5 contains this
security problem since it was discovered after the release.
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
A local attacker may obtain superuser privileges by exploiting the
buffer overflow bugs in fpexec.
IV. Workaround
1) Deinstall the mod_frontpage ports/packages if you have them installed.
V. Solution
Do one of the following:
1) Upgrade your entire ports collection and rebuild the port.
2) Deinstall the old package and install a new package dated after the
correction date, obtained from the following directories:
[i386]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/www/
[alpha]
Packages are not automatically generated for the alpha architecture at
this time due to lack of build resources.
NOTE: It may be several days before updated packages are available.
3) Download a new port skeleton for the mod_frontpage 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-4-stable/Latest/portcheckout.tgz
VI. Correction details
The following list contains the $FreeBSD$ revision numbers of each
file that was corrected in the FreeBSD source.
Path Revision
- - -------------------------------------------------------------------------
ports/www/mod_frontpage/Makefile 1.7
ports/www/mod_frontpage/distinfo 1.4
ports/www/mod_frontpage/files/patch-Makefile.PL 1.3
ports/www/mod_frontpage/files/patch-Makefile.in 1.1
ports/www/mod_frontpage/files/patch-mod_frontpage.c 1.4
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