JPCERT-AT-2007-0020
                                                             JPCERT/CC
                                                    September 21, 2007

                  <<< JPCERT/CC Alert 2007-09-21 >>>

                    Vulnerability in file archiver Lhaplus

             http://www.jpcert.or.jp/at/2007/at070020.txt

I. Overview

  Lhaplus, a file archiver widely used in Japan, contains a buffer
overflow vulnerability in ARJ-archive handling. Exploitation of this
vulnerability could allow a remote attacker to execute arbitrary code
when a user opens a specially crafted archive created by the attacker.


II. Systems Affected

  The following products and versions are affected:

    - Lhaplus for Windows 1.54 beta 1 and earlier

  For more information, refer to the developer's website.


III. Solution

  To fix this problem, update to a fixed version of the software
provided by the developer. For more information, see the following
website:

    Lhaplus distribution site
    http://www7a.biglobe.ne.jp/~schezo/


IV. Reference Information

    Japan Vulnerability Notes JVN#70734805
    Buffer Overflow Vulnerability in Lhaplus
    http://jvn.jp/jp/JVN%2370734805/index.html

    IT Security Center, Information-technology Promotion Agency, Japan (IPA)
    Security Alert on "Lhaplus" Vulnerability
    http://www.ipa.go.jp/security/vuln/200709_Lhaplus.html

    ARJ Archive Handling Buffer Overflow
    http://www7a.biglobe.ne.jp/~schezo/arj_vul.html


  If you have any information regarding this matter, please contact us.

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JPCERT Coordination Center (JPCERT/CC)
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