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Mandrake: leafnode denial of service vulnerability Print E-mail
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Posted by Team   
Mandrake This vulnerability causes leafnode to go into an infinite loop with 100% CPU use when an article that has been crossposed to several groups, one of which is the prefix of another, is requested by it's Message-ID.


                Mandrake Linux Security Update Advisory

Package name:           leafnode
Advisory ID:            MDKSA-2003:005
Date:                   January 14th, 2003

Affected versions:      8.2, 9.0

Problem Description:

 A vulnerability was discovered by Jan Knutar in leafnode that
 Mark Brown pointed out could be used in a Denial of Service
 attack.  This vulnerability causes leafnode to go into an
 infinite loop with 100% CPU use when an article that has been
 crossposed to several groups, one of which is the prefix of
 another, is requested by it's Message-ID.

 This vulnerability was introduced in 1.9.20 and fixed upstream
 in version 1.9.30.  Only Mandrake Linux 9.0 is affected by this,
 but version 1.9.19 (which shipped with Mandrake Linux 8.2) is
 receiving an update due to critical bugs in it that can corrupt
 parts of its news spool under certain circumstances.


Updated Packages:

 Mandrake Linux 8.2:
 a9c3f6f4198c88e71f7c78281d6ead7b  8.2/RPMS/leafnode-1.9.31-1.1mdk.i586.rpm
 25f0be374ababf45db444a9b64ab1a98  8.2/SRPMS/leafnode-1.9.31-1.1mdk.src.rpm

 Mandrake Linux 8.2/PPC:
 c39ab8855cbb4d0727c796242edda60c  ppc/8.2/RPMS/leafnode-1.9.31-1.1mdk.ppc.rpm
 25f0be374ababf45db444a9b64ab1a98  ppc/8.2/SRPMS/leafnode-1.9.31-1.1mdk.src.rpm

 Mandrake Linux 9.0:
 4749ee927caa55f15adddadd473a3d12  9.0/RPMS/leafnode-1.9.31-1.1mdk.i586.rpm
 25f0be374ababf45db444a9b64ab1a98  9.0/SRPMS/leafnode-1.9.31-1.1mdk.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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