[NEWS] RARLabs Unrar Password Prompt Buffer Overflow Vulnerability



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RARLabs Unrar Password Prompt Buffer Overflow Vulnerability
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SUMMARY

Un <http://www.rarlabs.com/> rar is a command line archive extractor for
Windows and Linux.

Remote exploitation of a stack based buffer overflow vulnerability in
RARLabs Unrar may allow an attacker to execute arbitrary code with the
privileges of the user opening the archive. Unrar is prone to a stack
based buffer overflow when processing specially crafted password protected
archives.

DETAILS

Vulnerable Systems:
* Unrar version 3.60 for Linux
* Unrar version 3.61 for Windows.
* (Previous versions may also be affected.)

Immune Systems:
* Unrar version 3.70 for Linux

Exploitation of the vulnerability could allow an attacker to execute
arbitrary code with the privileges of the user opening the file.
Exploitation would require that an attacker hosts a maliciously crafted
document on a website and entice users to visit the site. An attacker
could also e-mail the malicious document and use social engineering
techniques to trick the e-mail recipient into opening the document.

There are several mitigating factors for this vulnerability. Nearly all
Windows users will use the GUI based WinRAR to open archives, and it is
not vulnerable. If users are using the vulnerable command line based
unrar, they still need to interact with the program in order to trigger
the vulnerability. They must respond to the prompt asking for the
password, after which the vulnerability will be triggered. They do not
need to enter a correct password, but they must at least push the enter
key.

Vendor Status:
RARLabs has addressed this vulnerability with the version 3.70 beta
release of WinRAR.

Vendor Status:
* 12/12/2006 - Initial vendor notification
* 01/09/2007 - Initial vendor response
* 02/07/2007 - Coordinated public disclosure


ADDITIONAL INFORMATION

The information has been provided by iDefense.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=472>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=472



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