[ GLSA 200606-25 ] Hashcash: Possible heap overflow

[GLSA]

Gentoo Linux Security Advisory

Title: Hashcash: Possible heap overflow (GLSA 200606-25)
Severity: high
Exploitable: remote
Date: June 26, 2006
Updated: July 29, 2006
Bug(s): #134960
ID: 200606-25

Synopsis


A heap overflow 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: net-misc/hashcash
Vulnerable: < 1.21
Unaffected: >= 1.21
Architectures: All supported architectures


Description


Andreas Seltenreich has reported a possible heap overflow in the
array_push() function in hashcash.c, as a result of an incorrect amount
of allocated memory for the "ARRAY" structure.


Impact


By sending malicious entries to the Hashcash utility, an attacker may
be able to cause an overflow, potentially resulting in the execution of
arbitrary code with the privileges of the user running the application.


Workaround


There is no known workaround at this time.


Resolution


All Hashcash users should upgrade to the latest version: