Hashcash: Format string vulnerability
Gentoo Linux Security Advisory
||GLSA 200503-12 / Hashcash
||March 06, 2005
||May 22, 2006: 02
All supported architectures
A format string vulnerability in the Hashcash utility could allow an
attacker to execute arbitrary code.
Hashcash is a utility for generating Hashcash tokens, a proof-of-work
system to reduce the impact of spam.
Tavis Ormandy of the Gentoo Linux Security Audit Team identified a flaw
in the Hashcash utility that an attacker could expose by specifying a
malformed reply address.
Successful exploitation would permit an attacker to disrupt Hashcash
users, and potentially execute arbitrary code.
There is no known workaround at this time.
All Hashcash users should upgrade to the latest version:
Code Listing 3.1: Resolution
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/hashcash-1.16-r1"