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Linux-Mandrake Security Update Advisory: perl update

Aug 10, 2000, 06:02 (0 Talkback[s])

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Date: Tue, 8 Aug 2000 22:04:45 -0600
From: Linux Mandrake Security Team security@LINUX-MANDRAKE.COM
To: BUGTRAQ@SECURITYFOCUS.COM
Subject: MDKSA-2000:031 perl update

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                Linux-Mandrake Security Update Advisory


Package name:           perl
Date:                   August 8th, 2000
Advisory ID:            MDKSA-2000:031

Affected versions:      6.0, 6.1, 7.0, 7.1

Problem Description:

There is a vulnerability that exists when using setuidperl together with the mailx program. In some cases, setuidperl will warn root that something has going on. The setuidperl program uses /bin/mail to send the message, as root, with the environment preserved. An undocumented feature of /bin/mail consists of it interpretting the ~! sequence even if it is not running on the terminal, and the message also contains the script name, taken from argv[1]. With all of this combined, it is possible to execute a command using ~! passed in the script name to create a suid shell. The instance of setuidperl sending such a message can only be reached if you try to fool perl into forcing the execution of one file instead of another. This vulnerability may not be limited to just the mailx program, which is why an upgrade for perl is provided as opposed to an upgrade for mailx.


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" or by using a version of RPM greater than 3.0 with the command "rpm -K package_name". This will also check the GnuPG signature of the package provided you have the public key as part of your keyring (the public key is provided at the end of this advisory).

Linux-Mandrake 6.0:
1c42a4a20c7c042f78ae846cc9bfdc81 6.0/RPMS/perl-5.00503-5mdk.i586.rpm
3c0d7424d519fc616ce6c902dbbbf760 6.0/SRPMS/perl-5.00503-5mdk.src.rpm

Linux-Mandrake 6.1:
cfdba31ce88d7a72f00ae2f27d4596db 6.1/RPMS/perl-5.00503-5mdk.i586.rpm
3c0d7424d519fc616ce6c902dbbbf760 6.1/SRPMS/perl-5.00503-5mdk.src.rpm

Linux-Mandrake 7.0:
054c9b11a79651d742a465f8ca15a0e8 7.0/RPMS/perl-5.00503-11mdk.i586.rpm
7b699435cc912993d21f4b35f780b366 7.0/RPMS/perl-base-5.00503-11mdk.i586.rpm
86eb8dea7b0ed397cb145a9cc118843e 7.0/SRPMS/perl-5.00503-11mdk.src.rpm

Linux-Mandrake 7.1:
39a43d7f8449a692e11fa384343dc939 7.1/RPMS/perl-5.600-5mdk.i586.rpm
025428ebc98430c138979f9cd3f1bdb8 7.1/RPMS/perl-base-5.600-5mdk.i586.rpm
332ef51a58f9946b5c834fd1acc681bd 7.1/SRPMS/perl-5.600-5mdk.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
  security@linux-mandrake.com

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