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secunia-linkgrammar.txt

secunia-linkgrammar.txt
Posted Nov 7, 2007
Authored by Alin Rad Pop | Site secunia.com

Secunia Research has discovered a vulnerability in Link Grammar, which can be exploited by malicious people to compromise an application using the affected code. Version 4.1b is affected.

tags | advisory
advisories | CVE-2007-5395
SHA-256 | 4f0f9129c0c405b31977030fcfdf263ff9f2e4be0e99cafe4813fc14f9401248

secunia-linkgrammar.txt

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====================================================================== 

Secunia Research 07/11/2007

- Link Grammar "separate_sentence()" Buffer Overflow -

======================================================================
Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

======================================================================
1) Affected Software

* Link Grammar 4.1b.

NOTE: Other versions may also be affected.

======================================================================
2) Severity

Rating: Moderately critical
Impact: System access
Where: Remote

======================================================================
3) Vendor's Description of Software

"The Link Grammar Parser is a syntactic parser of English, based on
link grammar, an original theory of English syntax. Given a sentence,
the system assigns to it a syntactic structure, which consists of a
set of labeled links connecting pairs of words. The parser also
produces a "constituent" representation of a sentence (showing noun
phrases, verb phrases, etc.)"

Product Link:
http://www.link.cs.cmu.edu/link/

======================================================================
4) Description of Vulnerability

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.

======================================================================
5) Solution

Do not parse untrusted text using the affected function.

======================================================================
6) Time Table

23/10/2007 - Vendor notified.
07/11/2007 - Public disclosure.

======================================================================
7) Credits

Discovered by Alin Rad Pop, Secunia Research.

======================================================================
8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned
CVE-2007-5395 for the vulnerability.

======================================================================
9) About Secunia

Secunia offers vulnerability management solutions to corporate
customers with verified and reliable vulnerability intelligence
relevant to their specific system configuration:

http://corporate.secunia.com/

Secunia also provides a publicly accessible and comprehensive advisory
database as a service to the security community and private
individuals, who are interested in or concerned about IT-security.

http://secunia.com/

Secunia believes that it is important to support the community and to
do active vulnerability research in order to aid improving the
security and reliability of software in general:

http://corporate.secunia.com/secunia_research/33/

Secunia regularly hires new skilled team members. Check the URL below
to see currently vacant positions:

http://secunia.com/secunia_vacancies/

Secunia offers a FREE mailing list called Secunia Security Advisories:

http://secunia.com/secunia_security_advisories/

======================================================================
10) Verification

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2007-78/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

======================================================================
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