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From: Bryan Paxton <bpaxton@SECURITYPORTAL.COM>
To: LINUX-SECURITY@LISTSERV.SECURITYPORTAL.COM
Subject: LSLID:2001050802 - Progeny - mandb - PROGENY-SA-2001-12
Date: Tue, 8 May 2001 09:15:33 -0500
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LSLID:2001050802
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PROGENY SERVICE NETWORK -- SECURITY ADVISORY PROGENY-SA-2001-12
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Synopsis: mandb handles temporary databases insecurely
Software: man-db
History:
2001-04-30 Vendor patch/fix available
2001-05-03 Update available in Progeny archive
2001-05-08 Advisory sent
Credits: Ethan Benson
Colin Phipps
Affects: Progeny Debian (man-db prior to 2.3.17-1.4)
Debian GNU/Linux
Progeny Only: NO
Vendor-Status: New Version Released
(man-db_2.3.17-1.4)
$Progeny: security/advisory/PROGENY-SA-2001-12,v 1.1 2001/05/07 22:29:51
jdaily Exp $
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SUMMARY
Local users on a system may be able, through the use of symlink
attacks, to overwrite the mandb executable and replace it with a
trojan horse that could lead to further compromise of a system.
DETAILED DESCRIPTION
mandb (invoked by the man command) creates a temporary database in manual
page directories. Previously, even when the directory was writable by the
invoking user, mandb would retain its effective uid ("man").
Local users might exploit this bug to overwrite the mandb binary on
the system, since it is both owned by and runs with the permissions of
the "man" user. By overwriting this binary, other users on the
system, including root, could be tricked into running arbitrary code
that could produce additional security problems on the system.
SOLUTION (See also: UPDATING VIA APT-GET)
Upgrade to a fixed version of the man-db package. man-db version
2.3.17.1-4 corrects the problem. For your convenience, you may upgrade to
the man-db_2.3.17.1-4 package.
UPDATING VIA APT-GET
1. Ensure that your /etc/apt/sources.list file has a URI for Progeny's
update repository:
deb http://archive.progeny.com/progeny updates/newton/
2. Update your cache of available packages for apt(8).
Example:
# apt-get update
3. Using apt(8), install the new package. apt(8) will download the
update, verify its integrity with md5, and then install the
package on your system with dpkg(8).
Example:
# apt-get install man-db
UPDATING VIA DPKG
1. Use your preferred FTP/HTTP client to retrieve the following
updated files from Progeny's update archive at:
http://archive.progeny.com/progeny/updates/newton/
MD5 Checksum Filename
-------------------------------- -------------------------------------
cf508dcdb28a80f0548ca844598f8ef1 man-db_2.3.17.1-4_i386.deb
Example:
$ wget \
http://archive.progeny.com/progeny/updates/newton/man-db_2.3.17.1-4_i386.deb
2. Use the md5sum command on the retrieved files to verify that they
match the md5sum provided in this advisory:
Example:
$ md5sum man-db_2.3.17.1-4_i386.deb
3. Then install the replacement package(s) using the dpkg command.
Example:
# dpkg --install man-db_2.3.17.1-4_i386.deb
WORKAROUND
No known workaround exists for this vulnerability.
MORE INFORMATION
Progeny advisories can be found at http://www.progeny.com/security/.
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pub 1024D/F92D4D1F 2001-04-04 Progeny Security Team <security@progeny.com>
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