[Full-Disclosure] [ GLSA 200503-12 ] Hashcash: Format string vulnerability

2005-03-07T00:00:00
ID SECURITYVULNS:DOC:8000
Type securityvulns
Reporter Securityvulns
Modified 2005-03-07T00:00:00

Description


Gentoo Linux Security Advisory GLSA 200503-12


                                        http://security.gentoo.org/

Severity: Normal Title: Hashcash: Format string vulnerability Date: March 06, 2005 Bugs: #83541 ID: 200503-12


Synopsis

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

Background

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

Affected packages

-------------------------------------------------------------------
 Package            /  Vulnerable  /                    Unaffected
-------------------------------------------------------------------

1 net-misc/hashcash < 1.16-r1 >= 1.16-r1

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.

Workaround

There is no known workaround at this time.

Resolution

All Hashcash users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose &quot;&gt;=net-misc/hashcash-1.16-r1&quot;

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website:

http://security.gentoo.org/glsa/glsa-200503-12.xml

Concerns?

Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.

License

Copyright 2005 Gentoo Foundation, Inc; referenced text belongs to its owner(s).

The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.0