full-disclosure - [USN-104-1] unshar vulnerability

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Message-ID: <87wtri3eno.fsf@deneb.enyo.de>
Date: Mon Apr  4 13:33:23 2005
From: fw at deneb.enyo.de (Florian Weimer)
Subject: [USN-104-1] unshar vulnerability

* Martin Pitt:

> Joey Hess discovered that "unshar" created temporary files in an
> insecure manner. This could allow a symbolic link attack to create or
> overwrite arbitrary files with the privileges of the user invoking the
> program.

Keep in mind that by design, unshar just pipes its input file to
/bin/sh.  Technically, the temporary file issue discovered by Joey is
still a vulnerability (as the attack vector is different), but it's
very desirable to phase out any remaining use of unshar (and shell
archives in general).