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Hashcash: Format string vulnerability

Content:

1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200503-12 / Hashcash
Release Date March 06, 2005
Latest Revision May 22, 2006: 02
Impact normal
Exploitable remote
Package Vulnerable versions Unaffected versions Architecture(s)
net-misc/hashcash < 1.16-r1 >= 1.16-r1 All supported architectures

Related bugreports: #83541

Synopsis

A format string vulnerability in the Hashcash utility could allow an attacker to execute arbitrary code.

2.  Impact Information

Background

Hashcash is a utility for generating Hashcash tokens, a proof-of-work system to reduce the impact of spam.

Description

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.

Impact

Successful exploitation would permit an attacker to disrupt Hashcash users, and potentially execute arbitrary code.

3.  Resolution Information

Workaround

There is no known workaround at this time.

Resolution

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"

4.  References



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Page updated March 06, 2005

Summary: This is a Gentoo Linux Security Advisory

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