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Insecure Library Loading
Moderately critical

Link Grammar "separate_sentence()" Buffer Overflow

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Release Date:  2007-11-07    Views:  7,327

Secunia Advisory SA27300

Where:

From remote

Impact:

System access

Solution Status:

Unpatched

Software:

CVE Reference(s):

Description


Secunia Research has discovered a vulnerability in Link Grammar, which can be exploited by malicious people to compromise an application using the affected code.

The vulnerability is caused due to a boundary error within the "separate_word()" function in tokenize.c when processing overly long words (over 61 bytes). This can be exploited to cause a stack-based buffer overflow via a specially crafted sentence passed to the "separate_sentence()" function.

Successful exploitation allows execution of arbitrary code.

The vulnerability is confirmed in version 4.1b. Other versions may also be affected.


Solution:
Do not parse untrusted text using the affected function.

Provided and/or discovered by:
Alin Rad Pop, Secunia Research

Original Advisory:
Secunia Research:
http://secunia.com/secunia_research/2007-78/

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Link Grammar "separate_sentence()" Buffer Overflow

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