A format string vulnerability in the Hashcash utility could allow an attacker to execute arbitrary code.
|Package||net-misc/hashcash on all architectures|
|Affected versions||< 1.16-r1|
|Unaffected versions||>= 1.16-r1|
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:
# emerge --sync # emerge --ask --oneshot --verbose ">=net-misc/hashcash-1.16-r1"
March 06, 2005
May 22, 2006: 02