Bug 1012974 - (CVE-2013-4385) CVE-2013-4385 chicken: buffer overrun
CVE-2013-4385 chicken: buffer overrun
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1012977 1012979
Blocks: 1012976
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Reported: 2013-09-27 09:28 EDT by Ratul Gupta
Modified: 2014-01-27 03:39 EST (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2013-11-24 21:40:40 EST
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Description Ratul Gupta 2013-09-27 09:28:01 EDT
Chicken, a compiler for the Scheme programming language, is found to have a buffer overrrun flaw due to the read-string! procedure from the "extras" unit, when used in a particular way.

It was found that there was a missing check for the situation when NUM was at #f (the scheme value for false) in the buffer as the buffer size, then it will read beyond the buffer until the input port is exhausted. This may result in a DoS or a remote code execution.

Though currently all stable releases are vulnerable to this flaw, there is a simple workaround to be used in code that uses read-string!: simply convert all (read-string! #f buf ...) invocations to (read-string! (string-length buf) buf ...) or, if possible, use the non-destructive read-string procedure from the same unit.

Comment 1 Ratul Gupta 2013-09-27 09:31:18 EDT
Created chicken tracking bugs for this issue:

Affects: fedora-all [bug 1012977]
Affects: epel-6 [bug 1012979]
Comment 2 Fedora Update System 2013-09-29 20:48:00 EDT
chicken- has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

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