Ulf Harnhammar discovered two problems in hypermail, a program to
create HTML archives of mailing lists.
An attacker could craft a long filename for an attachment that would
overflow two buffers when a certain option for interactive use was
given, opening the possibility to inject arbitrary code. This code
would then be executed under the user id hypermail runs as, mostly as
a local user. Automatic and silent use of hypermail does not seem to
be affected.
The CGI program mail, which is not installed by the Debian package,
does a reverse look-up of the user's IP number and copies the
resulting hostname into a fixed-size buffer. A specially crafted DNS
reply could overflow this buffer, opening the program to an exploit.
