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Linux-Mandrake Security Update Advisory: glibc update

Sep 07, 2000, 17:53 (0 Talkback[s])

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Date: Wed, 6 Sep 2000 22:26:09 -0600
From: Linux Mandrake Security Team security@LINUX-MANDRAKE.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: MDKSA-2000:045 - glibc update


                Linux-Mandrake Security Update Advisory


Package name:           glibc
Date:                   September 6th, 2000
Advisory ID:            MDKSA-2000:045

Affected versions:      7.0, 7.1

Problem Description:

A bug was discovered in ld.so that could allow local users to obtain root privileges. The dynamic loader, ld.so, is responsible for making shared libraries available within a program at run-time. Normally, a user is allowed to load additional shared libraries when executing a program; they can be specified with environment variables such as LD_PRELOAD. Because this is not acceptable for applications that are setuid root, ld.so normally removes these environment variables for setuid root programs. The discovered bug causes these environment variables to not be removed under certain circumstances. While setuid programs themselves are not vulnerable, external programs they execute can be affected by this problem.

A number of additional bugs have been found in the glibc locale and internationaliztion security checks. In internationalized programs, users are permitted to select a locale or choose message catalogues using environment variables such as LANG or LC_*. The content of these variables is then used as part of the pathname used to search message catalogues or locale files. Under normal circumstances, if these variables contained the "/" character, a program could load the internationalization files from arbitrary directories. This is not acceptable for setuid programs, which is the reason glibc does not allow certain settings of these variables if the program is setuid or setgid. However, some of these checks were done in inapporpriate places, contained bugs, or were missing entirely. It is highly probable that some of these bugs can be used for local root exploits.


Please verify these md5 checksums of the updates prior to upgrading to ensure the integrity of the downloaded package. You can do this by running the md5sum program on the downloaded package by using "md5sum package.rpm".

Linux-Mandrake 7.0:
05e57344e0141d4f5085f78155b58b66 7.0/RPMS/glibc-2.1.3-16mdk.i586.rpm
284ee4868af286469169a4a6605d3172 7.0/RPMS/glibc-devel-2.1.3-16mdk.i586.rpm
114c605878c338ed36aabe9b673cd4fd 7.0/RPMS/glibc-profile-2.1.3-16mdk.i586.rpm
1f263ca77795b93b54e0af5644149407 7.0/SRPMS/glibc-2.1.3-16mdk.src.rpm

Linux-Mandrake 7.1:
f34a2988c60b32baeef205c0a0586b8e 7.1/RPMS/glibc-2.1.3-17mdk.i586.rpm
28c96de9e746eb0c7b3bcc0c58728fd9 7.1/RPMS/glibc-devel-2.1.3-17mdk.i586.rpm
27805991e31882d827bb032453fd5f16 7.1/RPMS/glibc-profile-2.1.3-17mdk.i586.rpm
eec3d0d92b216e0a47bc4909b6fbdfaf 7.1/SRPMS/glibc-2.1.3-17mdk.src.rpm


To upgrade automatically, use « MandrakeUpdate ».

If you want to upgrade manually, download the updated package from one of our FTP server mirrors and uprade with "rpm -Uvh package_name".

You can download the updates directly from:
ftp://ftp.linux.tucows.com/pub/distributions/Mandrake/Mandrake/updates
ftp://ftp.free.fr/pub/Distributions_Linux/Mandrake/updates

Or try one of the other mirrors listed at:

http://www.linux-mandrake.com/en/ftp.php3.

Updated packages are available in the "updates/[ver]/RPMS/" directory. For example, if you are looking for an updated RPM package for Linux-Mandrake 7.1, look for it in "updates/7.1/RPMS/". Updated source RPMs are available as well, but you generally do not need to download them.

Please be aware that sometimes it takes the mirrors a few hours to update, so if you want an immediate upgrade, please use one of the two above-listed mirrors.

You can view other security advisories for Linux-Mandrake at:

http://www.linux-mandrake.com/en/fupdates.php3

If you want to report vulnerabilities, please contact

security@linux-mandrake.com


Linux-Mandrake has two security-related mailing list services that anyone can subscribe to:

security-announce@linux-mandrake.com

Linux-Mandrake's security announcements mailing list. Only announcements are sent to this list and it is read-only.

security-discuss@linux-mandrake.com

Linux-Mandrake's security discussion mailing list. This list is open to anyone to discuss Linux-Mandrake security specifically and Linux security in general.

To subscribe to either list, send a message to sympa@linux-mandrake.com with "subscribe [listname]" in the body of the message.

To remove yourself from either list, send a message to sympa@linux-mandrake.com with "unsubscribe [listname]" in the body of the message.

To get more information on either list, send a message to sympa@linux-mandrake.com with "info [listname]" in the body of the message.

Optionally, you can use the web interface to subscribe to or unsubscribe from either list:

http://www.linux-mandrake.com/en/flists.php3#security