Mandrake alert: Updated ypserv packages fix DoS vulnerability

Posted by dave on Jun 27, 2003 9:45 AM EDT
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A vulnerability was found in versions of ypserv prior to version 2.7. If a malicious client were to query ypserv via TCP and subsequently ignore the server's response, ypserv will block attempting to send the reply. The result is that ypserv will fail to respond to other client requests. ypserv 2.7 and above have been altered to fork a child for each client request, which prevents any one request from causing the server to block.

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Mandrake Linux Security Update Advisory ________________________________________________________________________

Package name: ypserv Advisory ID: MDKSA-2003:072 Date: June 27th, 2003

Affected versions: 8.2, 9.0, Corporate Server 2.1 ________________________________________________________________________

Problem Description:

A vulnerability was found in versions of ypserv prior to version 2.7. If a malicious client were to query ypserv via TCP and subsequently ignore the server's response, ypserv will block attempting to send the reply. The result is that ypserv will fail to respond to other client requests. ypserv 2.7 and above have been altered to fork a child for each client request, which prevents any one request from causing the server to block. ________________________________________________________________________

References: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0251 http://www.linux-nis.org/nis/ypserv/ChangeLog ________________________________________________________________________

Updated Packages: Corporate Server 2.1: be3c830d0e8d0064cf90cb09004c5a85 corporate/2.1/RPMS/ypserv-2.8-1.1mdk.i586.rpm f552ee4c593c22ce072697525e3f4bc8 corporate/2.1/SRPMS/ypserv-2.8-1.1mdk.src.rpm

Mandrake Linux 8.2: 052f5c4709db478e7cfb3116a11c1a7d 8.2/RPMS/ypserv-2.8-1.1mdk.i586.rpm f552ee4c593c22ce072697525e3f4bc8 8.2/SRPMS/ypserv-2.8-1.1mdk.src.rpm

Mandrake Linux 8.2/PPC: 7e64df237654d9c2c2641c4bd4c9b697 ppc/8.2/RPMS/ypserv-2.8-1.1mdk.ppc.rpm f552ee4c593c22ce072697525e3f4bc8 ppc/8.2/SRPMS/ypserv-2.8-1.1mdk.src.rpm

Mandrake Linux 9.0: be3c830d0e8d0064cf90cb09004c5a85 9.0/RPMS/ypserv-2.8-1.1mdk.i586.rpm f552ee4c593c22ce072697525e3f4bc8 9.0/SRPMS/ypserv-2.8-1.1mdk.src.rpm ________________________________________________________________________

Bug IDs fixed (see https://qa.mandrakesoft.com for more information): ________________________________________________________________________

To upgrade automatically, use MandrakeUpdate. The verification of md5 checksums and GPG signatures is performed automatically for you.

If you want to upgrade manually, download the updated package from one of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of FTP mirrors can be obtained from:

http://www.mandrakesecure.net/en/ftp.php

Please verify the update prior to upgrading to ensure the integrity of the downloaded package. You can do this with the command:

rpm --checksig <filename>

All packages are signed by MandrakeSoft for security. You can obtain the GPG public key of the Mandrake Linux Security Team from:

https://www.mandrakesecure.net/RPM-GPG-KEYS

Please be aware that sometimes it takes the mirrors a few hours to update.

You can view other update advisories for Mandrake Linux at:

http://www.mandrakesecure.net/en/advisories/

MandrakeSoft has several security-related mailing list services that anyone can subscribe to. Information on these lists can be obtained by visiting:

http://www.mandrakesecure.net/en/mlist.php

If you want to report vulnerabilities, please contact

security_linux-mandrake.com

Type Bits/KeyID Date User ID pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team <security linux-mandrake.com>

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