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             AUSCERT External Security Bulletin Redistribution

                 ESB-2001.518 -- OpenBSD Security Advisory
                          security issue with lpd
                              6 December 2001

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                lpd
Vendor:                 OpenBSD
Operating System:       OpenBSD-2.8
                        OpenBSD-2.9
                        OpenBSD-3.0
Impact:                 Create Arbitrary Files
Access Required:        Existing Account

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A security issue exists with lpd (the line printer daemon) that may
allow an attacker to create arbitrary new files in the root directory.
Only machines with line printer access (ie: listed in either
/etc/hosts.lpd or /etc/hosts.equiv) may be used to mount an attack
and the attacker must have root access on the machine.
OpenBSD does not start lpd in the default installation.

This problem is fixed in OpenBSD-current, the 3.0 patch branch (aka
3.0-stable) and the 2.9 branch (aka 2.9-stable).

A patch exists to fix the problem:

For OpenBSD-2.9 (as well as OpenBSD-2.8):
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/2.9/common/017_lpd.patch

For OpenBSD-3.0
    ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.0/common/008_lpd.patch

Credit for finding this bug (and the corresponding patch) goes
to Sebastian Krahmer of SuSE.

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