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Home » Hacking News » [DSA 198-1] New nullmailer packages fix local denial of service

[DSA 198-1] New nullmailer packages fix local denial of service

by Nikola Strahija on November 18th, 2002 A problem has been discovered in nullmailer, a simple relay-only mail transport agent for hosts that relay mail to a fixed set of smart relays. When a mail is to be delivered locally to a user that doesn't exist, nullmailer tries to deliver it, discovers a user unknown error and stops delivering. Unfortunately, it stops delivering entirely, not only this mail. Hence, it's very easy to craft a denial of service.

This problem has been fixed in version 1.00RC5-16.1woody2 for the
current stable distribution (woody) and in version 1.00RC5-17 for the
unstable distribution (sid). The old stable distribution (potato)
does not contain a nullmailer package.

We recommend that you upgrade your nullmailer package.

wget url
will fetch the file for you
dpkg -i file.deb
will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
will update the internal database
apt-get upgrade
will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.0 alias woody
- --------------------------------

Source archives:
Size/MD5 checksum: 602 39d11580de5a781c1cadf6d422164d8c
Size/MD5 checksum: 6298 179e56c04af207b19ff020f66b580419
Size/MD5 checksum: 111691 61041ff5b1e41f9280d63a04c3383144

Alpha architecture:
Size/MD5 checksum: 103944 e46443575ae0a0d55475423b1e31bdeb

ARM architecture:
Size/MD5 checksum: 70804 2feab48d3941330c03f00567488831f5

Intel IA-32 architecture:
Size/MD5 checksum: 68558 ec8e1b3f33bc436897358c80a6f43b3c

Intel IA-64 architecture:
Size/MD5 checksum: 144246 c508c104d7b775e84641aabdc2adf209

HP Precision architecture:
Size/MD5 checksum: 88306 87b75f52b7ae1e8bdab2a121b79492bd

Motorola 680x0 architecture:
Size/MD5 checksum: 67616 29f83614261e229bff40b1c54b12fa3b

Big endian MIPS architecture:
Size/MD5 checksum: 102682 91e6a2aabc65fb2b430619dc625a6485

Little endian MIPS architecture:
Size/MD5 checksum: 101292 83745fe1ea40cdefb298e2d55f1e0a2b

PowerPC architecture:
Size/MD5 checksum: 73996 81bbf1beb5a46a08405d1e4535b4ae44

IBM S/390 architecture:
Size/MD5 checksum: 72914 3e5608138030d4577e14e0f17144a2ff

Sun Sparc architecture:
Size/MD5 checksum: 73748 cb947e14ce9c2803d55f959d4f03f454

These files will probably be moved into the stable distribution on
its next revision.

Survey on the use of Debian GNU/Linux 2.2 alias potato:

- ---------------------------------------------------------------------------------
For apt-get: deb stable/updates main
For dpkg-ftp: dists/stable/updates/main
Mailing list: [email protected]
Package info: `apt-cache show ' and;

Version: GnuPG v1.0.7 (GNU/Linux)


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