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Linux-Mandrake Security Update Advisory: glibc update

Jan 18, 2001, 23:13 (4 Talkback[s])

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Date: Thu, 18 Jan 2001 14:58:19 -0700
From: Linux Mandrake Security Team
To: Linux Mandrake Security Announcements
Subject: [Security Announce] MDKSA-2001:012 - glibc update


                Linux-Mandrake Security Update Advisory


Package name:           glibc
Date:                   January 18th, 2001
Advisory ID:            MDKSA-2001:012

Affected versions:      6.0, 6.1, 7.0, 7.1, 7.2, Corporate Server 1.0.1

Problem Description:

The LD_PRELOAD variable in the GNU C Library is honoured normally even for SUID/SGID applications (but removed afterwards from the environment) if it does not contain '/' characters. There is a special check which only preloads found libraries if they have the SUID bit set. However, if a library has been found in /etc/ld.so.cache, this check was not performed. As a result, a malicious user could preload some library located in /lib or /usr/lib before SUID/SGID applications and create or overwrite a file he would not normally have permission to. As well, LD_PROFILE output from SUID programs would go into /var/tmp, making it vulnerable to various link attacks.


Please verify the update prior to upgrading to ensure the integrity of the downloaded package. You can do this with the command:
rpm --checksig package.rpm
You can get the GPG public key of the Linux-Mandrake Security Team at
http://www.linux-mandrake.com/en/security/RPM-GPG-KEYS
If you use MandrakeUpdate, the verification of md5 checksum and GPG signature is performed automatically for you.

Linux-Mandrake 6.0:
40c5a62fe717337c78b89162e706b204 6.0/RPMS/glibc-2.1.3-18.2mdk.i586.rpm
853008b0e720f9ae4cee919edb9b299f 6.0/RPMS/glibc-devel-2.1.3-18.2mdk.i586.rpm
395f5b6ce2ac5a9d712112d5c025d037 6.0/RPMS/glibc-profile-2.1.3-18.2mdk.i586.rpm
96d42b788a258f9d89974abb16646489 6.0/SRPMS/glibc-2.1.3-18.2mdk.src.rpm

Linux-Mandrake 6.1:
40c5a62fe717337c78b89162e706b204 6.1/RPMS/glibc-2.1.3-18.2mdk.i586.rpm
853008b0e720f9ae4cee919edb9b299f 6.1/RPMS/glibc-devel-2.1.3-18.2mdk.i586.rpm
395f5b6ce2ac5a9d712112d5c025d037 6.1/RPMS/glibc-profile-2.1.3-18.2mdk.i586.rpm
96d42b788a258f9d89974abb16646489 6.1/SRPMS/glibc-2.1.3-18.2mdk.src.rpm

Linux-Mandrake 7.0:
40c5a62fe717337c78b89162e706b204 7.0/RPMS/glibc-2.1.3-18.2mdk.i586.rpm
853008b0e720f9ae4cee919edb9b299f 7.0/RPMS/glibc-devel-2.1.3-18.2mdk.i586.rpm
395f5b6ce2ac5a9d712112d5c025d037 7.0/RPMS/glibc-profile-2.1.3-18.2mdk.i586.rpm
96d42b788a258f9d89974abb16646489 7.0/SRPMS/glibc-2.1.3-18.2mdk.src.rpm

Linux-Mandrake 7.1:
05f0ef4d07e638706262ff606518aedd 7.1/RPMS/glibc-2.1.3-18.1mdk.i586.rpm
8681ffba3948fdc1e3fa2ecbf1eab54d 7.1/RPMS/glibc-devel-2.1.3-18.1mdk.i586.rpm
3f5316876c80c318cb39c68294412239 7.1/RPMS/glibc-profile-2.1.3-18.1mdk.i586.rpm
f68106cdfb899877f9984c1b9aabed70 7.1/SRPMS/glibc-2.1.3-18.1mdk.src.rpm

Linux-Mandrake 7.2:
4720a8d7f0c973a3eec8a7539766b590 7.2/RPMS/glibc-2.1.3-18.3mdk.i586.rpm
fcdbafc369120fb5a81566fd3cdabe03 7.2/RPMS/glibc-devel-2.1.3-18.3mdk.i586.rpm
df76db4b226004082bbc0eb4d1034e87 7.2/RPMS/glibc-profile-2.1.3-18.3mdk.i586.rpm
09c064f52f8b1e0ac28fa30fa171dd7c 7.2/SRPMS/glibc-2.1.3-18.3mdk.src.rpm

Corporate Server 1.0.1:
05f0ef4d07e638706262ff606518aedd 1.0.1/RPMS/glibc-2.1.3-18.1mdk.i586.rpm
8681ffba3948fdc1e3fa2ecbf1eab54d 1.0.1/RPMS/glibc-devel-2.1.3-18.1mdk.i586.rpm
3f5316876c80c318cb39c68294412239 1.0.1/RPMS/glibc-profile-2.1.3-18.1mdk.i586.rpm
f68106cdfb899877f9984c1b9aabed70 1.0.1/SRPMS/glibc-2.1.3-18.1mdk.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/security/

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