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TurboLinux Security Announcement: All versions prior to glibc-2.1.3-27

Feb 16, 2001, 23:23 (0 Talkback[s])

Date: Fri, 16 Feb 2001 13:22:25 -0800
From: security@turbolinux.com
To: tl-security-announce@www1.turbolinux.com
Subject: [TL-Security-Announce] glibc-2.1.3-27 TLSA2000021-2


                        TurboLinux Security Announcement

        Vulnerable Packages: All versions prior to glibc-2.1.3-27
        Date: 02/14/2001 5:00 PDT

        Affected TurboLinux versions:TL 6.1 WorkStation,
                                     All TurboLinux versions
                                     6.0.5 and earlier

        TurboLinux Advisory ID#:  TLSA2000021-2

   Credits: This vulnerability was announced by RedHat in an advisory
            posted on BugTraq on January 16, 2001.

A security hole was discovered in the package mentioned above. Please update the package in your installation as soon as possible.


1. Problem Summary(From the BugTraq advisory at securityfocus.com, id#2223)

A problem with the library could allow access to write or overwrite restricted files.

2. Impact(Also from the BugTraq advisory on securityfocus.com)

Upon execution of SUID and SGID applications, the library allows a user to preload libraries in the environment variable LD_PRELOAD providing the variable does not contain forward slashes. A special check is also performed to ensure the library being preloaded is SUID. However, if the library is found in the /etc/ld.so.cache file, this check is circumvented, and never performed. It is therefore possible to load a library from /lib or /usr/lib prior to the execution of a SUID or SGID program. This flaw makes it possible for a user with malicious motives to create files in re- stricted locations, or overwrite files outside of the access of this user, including system files.

3. Solution

Update the package from our ftp server by running the following command for each package:

rpm -Uvh --nodeps --force ftp_path_to_filename

Where ftp_path_to_filename is the following:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/glibc-2.1.3-27.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/glibc-devel-2.1.3-27.i386.rpm
ftp://ftp.turbolinux.com/pub/updates/6.0/security/glibc-profile-2.1.3-27.i386.rpm

The source RPM can be downloaded here:

ftp://ftp.turbolinux.com/pub/updates/6.0/SRPMS/glibc-2.1.3-27.src.rpm

**Note: You must rebuild and install the RPM if you choose to download and install the SRPM. Simply installing the SRPM alone WILL NOT CLOSE THE SECURITY HOLE.

Please verify the MD5 checksums of the updates before you install:

  MD5 sum                               Package Name

13afe999cdcc5133aca98fc0a59c4340 glibc-2.1.3-27.i386.rpm
4a55428c154311387844fbf84600e789 glibc-devel-2.1.3-27.i386.rpm
6b48d26d9dc0ce224e4ea9c7a56fcc92 glibc-profile-2.1.3-27.i386.rpm
e0cd7ac0cca7a8e870247235e4f2e4cd glibc-2.1.3-27.src.rpm

These packages are GPG signed by Turbolinux for security. Our key is available here:

http://www.turbolinux.com/security/tlgpgkey.asc

To verify a package, use the following command:

rpm --checksig name_of_rpm

To examine only the md5sum, use the following command:

rpm --checksig --nogpg name_of_rpm

**Note: Checking GPG keys requires RPM 3.0 or higher.


You can find more updates on our ftp server:

ftp://ftp.turbolinux.com/pub/updates/6.0/security/ for TL6.0 Workstation and Server security updates
ftp://ftp.turbolinux.com/pub/updates/4.0/security/ for TL4.0 Workstation and Server security updates

Our webpage for security announcements:

http://www.turbolinux.com/security

If you want to report vulnerabilities, please contact:

security@turbolinux.com


Subscribe to the TurboLinux Security Mailing lists:

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Subscribe at http://www.turbolinux.com/mailman/listinfo/tl-security

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