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Category:   Application (Generic)  >   UnRAR Vendors:   Roshal, Eugene
UnRAR Stack Overflow in Processing Password Protected Archives Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017593
SecurityTracker URL:
CVE Reference:   CVE-2007-0855   (Links to External Site)
Updated:  May 19 2008
Original Entry Date:  Feb 7 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 3.70 beta
Description:   A vulnerability was reported in UnRAR. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted password-protected archive that, when processed by the target user, will trigger a stack overflow in the command line utility and execute arbitrary code on the target user's system. The overflow occurs when the target user responds to the password prompt (it does not matter what password value is entered). The code will run with the privileges of the target user.

The Windows GUI-based version is not affected.

The vendor was notified on December 12, 2006.

iDefense reported this vulnerability.

Impact:   A remote user can create a file that, when processed by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fixed version (3.70 beta).
Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any), UNIX (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 02.07.07: RARLabs Unrar Password Prompt

RARLabs Unrar Password Prompt Buffer Overflow Vulnerability

iDefense Security Advisory 02.07.07
Feb 07, 2007


Unrar is a command line archive extractor for Windows and Linux. For more
information visit the vendor's site at the URL shown below.


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.


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


iDefense has confirmed the existence of this vulnerability in version 3.60
for Linux and 3.61 for Windows. Previous versions may also be affected.


iDefense is currently unaware of any workarounds for this issue.


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


A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not
been assigned yet.


12/12/2006  Initial vendor notification
01/09/2007  Initial vendor response
02/07/2007  Coordinated public disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Disclaimer: The information in the advisory is believed to be accurate at
the time of publishing based on currently available information. Use of
the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
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