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TITLE:
Hashcash "array_push" Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA20800

VERIFY ADVISORY:
http://secunia.com/advisories/20800/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
Hashcash 1.x
http://secunia.com/product/4743/

DESCRIPTION:
A vulnerability has been reported in Hashcash, which can be exploited
by malicious people to cause a DoS (Denial of Service) and potentially
to compromise a vulnerable system.

The vulnerability is caused due to an memory allocation error within
the "array_push()" function in hashcash.c. This can potentially be
exploited to cause a heap-based buffer overflow via a large number of
"-r" or "-j" command line options passed to the application, or via a
large number of resource names passed to the application with it is
run with the "-m" option.

Successful exploitation requires that the application is configured
to accept command line options or resource names from non-trusted
sources.

The vulnerability has been reported in version 1.20. Prior versions
may also be affected.

SOLUTION:
Update to version 1.21 or later.
http://www.hashcash.org/

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Andreas Seltenreich.

ORIGINAL ADVISORY:
http://www.hashcash.org/source/CHANGELOG

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