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Hashcash "array_push" Buffer Overflow Vulnerability
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Secunia Advisory:
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SA20800
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Release Date:
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2006-06-27
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Last Update:
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2006-06-30
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Popularity:
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6,593 views
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Critical:
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Moderately critical
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Impact:
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DoS
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Hashcash 1.x
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| CVE reference: | CVE-2006-3251
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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.
Changelog:
2006-06-30: Added CVE reference.
Original Advisory:
http://www.hashcash.org/source/CHANGELOG
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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