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Mandrake: ypserv denial of service vulnerability Print E-mail
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Posted by Team   
Mandrake A vulnerability was found in versions of ypserv prior to version 2.7.


                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.


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 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:

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

  rpm --checksig 

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

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

You can view other update advisories for Mandrake Linux at:

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

If you want to report vulnerabilities, please contact

Type Bits/KeyID     Date       User ID
pub  1024D/22458A98 2000-07-10 Linux Mandrake Security Team

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