Linux Security
    Linux Security
    Linux Security

    Debian: 'nullmailer' Denial of Service

    Date 18 Nov 2002
    Posted By LinuxSecurity Advisories
    When a mail is to be delivered locally to a user that doesn'texist, nullmailer tries to deliver it, discovers a user unknown errorand stops delivering. Unfortunately, it stops delivering entirely,not only this mail.
    Debian Security Advisory DSA 198-1                     This email address is being protected from spambots. You need JavaScript enabled to view it.                             Martin Schulze
    November 18th, 2002            
    Package        : nullmailer
    Vulnerability  : denial of service
    Problem-type   : local
    Debian-specific: no
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    Package info: `apt-cache show ' and


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