From security@LINUX-MANDRAKE.COM Thu Sep 7 15:41:32 2000 From: Linux Mandrake Security Team To: BUGTRAQ@SECURITYFOCUS.COM Date: Wed, 6 Sep 2000 22:26:09 -0600 Subject: [BUGTRAQ] MDKSA-2000:045 - glibc update [The following text is in the "iso-8859-1" character set] [Your display is set for the "US-ASCII" character set] [Some characters may be displayed incorrectly] -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ________________________________________________________________________ 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 ________________________________________________________________________ Type Bits/KeyID Date User ID pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team - -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.1 (GNU/Linux) Comment: For info see http://www.gnupg.org mQGiBDlp594RBAC2tDozI3ZgQsE7XwxurJCJrX0L5vx7SDByR5GHDdWekGhdiday L4nfUax+SeR9SCoCgTgPW1xB8vtQc8/sinJlMjp9197a2iKM0FOcPlkpa3HcOdt7 WKJqQhlMrHvRcsivzcgqjH44GBBJIT6sygUF8k0lU6YnMHj5MPc/NGWt8wCg9vKo P0l5QVAFSsHtqcU9W8cc7wMEAJzQsAlnvPXDBfBLEH6u7ptWFdp0GvbSuG2wRaPl hynHvRiE01ZvwbJZXsPsKm1z7uVoW+NknKLunWKB5axrNXDHxCYJBzY3jTeFjsqx PFZkIEAQphLTkeXXelAjQ5u9tEshPswEtMvJvUgNiAfbzHfPYmq8D6x5xOw1IySg 2e/LBACxr2UJYCCB2BZ3p508mAB0RpuLGukq+7UWiOizy+kSskIBg2O7sQkVY/Cs iyGEo4XvXqZFMY39RBdfm2GY+WB/5NFiTOYJRKjfprP6K1YbtsmctsX8dG+foKsD LLFs7OuVfaydLQYp1iiN6D+LJDSMPM8/LCWzZsgr9EKJ8NXiyrQ6TGludXggTWFu ZHJha2UgU2VjdXJpdHkgVGVhbSA8c2VjdXJpdHlAbGludXgtbWFuZHJha2UuY29t PohWBBMRAgAWBQI5aefeBAsKBAMDFQMCAxYCAQIXgAAKCRCaqNDQIkWKmK6LAKCy /NInDsaMSI+WHwrquwC5PZrcnQCeI+v3gUDsNfQfiKBvQSANu1hdulq5AQ0EOWnn 7xAEAOQlTVY4TiNo5V/iP0J1xnqjqlqZsU7yEBKo/gZz6/+hx75RURe1ebiJ9F77 9FQbpJ9Epz1KLSXvq974rnVb813zuGdmgFyk+ryA/rTR2RQ8h+EoNkwmATzRxBXV Jb57fFQjxOu4eNjZAtfII/YXb0uyXXrdr5dlJ/3eXrcO4p0XAAMFBACCxo6Z269s +A4v8C6Ui12aarOQcCDlV8cVG9LkyatU3FNTlnasqwo6EkaP572448weJWwN6SCX Vl+xOYLiK0hL/6Jb/O9Agw75yUVdk+RMM2I4fNEi+y4hmfMh2siBv8yEkEvZjTcl 3TpkTfzYky85tu433wmKaLFOv0WjBFSikohGBBgRAgAGBQI5aefvAAoJEJqo0NAi RYqYid0AoJgeWzXrEdIClBOSW5Q6FzqJJyaqAKC0Y9YI3UFlE4zSIGjcFlLJEJGX lA== =WxWn - -----END PGP PUBLIC KEY BLOCK----- -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.1 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE5txikmqjQ0CJFipgRAh2+AKCF2y8wnt3w33xDh8MjPtV1v8j1BwCeJHza Y1fIbSBkyHGVJLDu9ZGbBeM= =uHdK -----END PGP SIGNATURE-----