Mandrake alert: Updated ypserv packages fix DoS vulnerability
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
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Package name: ypserv
Advisory ID: MDKSA-2003:072
Date: June 27th, 2003
Affected versions: 8.2, 9.0, Corporate Server 2.1
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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
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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
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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
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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
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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
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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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