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Category:   Application (Security)  >   Clam AntiVirus Vendors:   clamav.sourceforge.net
Clam AntiVirus MIME Parameter Directory Traversal Bug Lets Remote Users Overwrite Certain Files
SecurityTracker Alert ID:  1017660
SecurityTracker URL:  http://securitytracker.com/id/1017660
CVE Reference:   CVE-2007-0898   (Links to External Site)
Date:  Feb 16 2007
Impact:   Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 0.90 stable
Description:   A vulnerability was reported in Clam AntiVirus. A remote user can oerwrite certain files on the target system.

The software does not properly validate user-supplied input in the MIME header id parameter. A remote user can supply a specially crafted value containing '../' directory traversal characters to overwrite files on target system with the privileges of the clamd scanner process. Data from the MIME message body will be written to the specified file.

The vendor was notified on February 7, 2007.

iDefense reported this vulnerability.

Impact:   A remote user can overwrite files on the target system with the privileges of the clamd scanner.
Solution:   The vendor has issued a fixed version (0.90 stable).
Vendor URL:  www.clamav.net/ (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   None.


 Source Message Contents

Subject:  iDefense Security Advisory 02.15.07: Multiple Vendor ClamAV MIME

Multiple Vendor ClamAV MIME Parsing Directory Traversal Vulnerability

iDefense Security Advisory 02.15.07
http://labs.idefense.com/intelligence/vulnerabilities/
Feb 15, 2007

I. BACKGROUND

Clam AntiVirus is a multi-platform GPL anti-virus toolkit. ClamAV is often
integrated into mail gateways, and used to scan mail traffic for viruses.
More information about ClamAV is available from http://clamav.net/.
Multipurpose Internet Mail Extensions (MIME), is an internet standard for
sending email with non-text attachments, multi-part message bodies, and
non-ASCII character sets.

II. DESCRIPTION

Remote exploitation of a directory traversal vulnerability in Clam
AntiVirus' ClamAV allows attackers to overwrite files owned by the clamd
scanner.

The vulnerability specifically exists due to the lack of validation of the
id parameter string taken from a MIME header. When parsing a multi-part
message clam takes this string from the header and uses it to create a
local file. By sending a string such as "../../../../some/file" an
attacker can create or overwrite an arbitrary file owned by the clamd
process. Data from the message body is later written to this file.

III. ANALYSIS

Exploitation allows attackers to degrade the service of the ClamAV virus
scanning service. The most important mitigating factor is that the clam
process runs with the privileges of the clamav user and group. This group
has access to a limited subset of files on the host. A possible target for
overwriting is the virus database file. By overwriting this file an
attacker could then send a virus through the gateway without clam
recognizing it; this effectively denies service. Arbitrary viruses will be
allowed to pass through, creating a false sense of security.

IV. DETECTION

iDefense has confirmed this vulnerability affects Clam AntiVirus ClamAV
v0.88.6. All versions prior to the 0.90 stable release are suspected to be
vulnerable.

V. WORKAROUND

iDefense is unaware of any effective workarounds for this issue.

VI. VENDOR RESPONSE

Clam AntiVirus has addressed this vulnerability in the version 0.90 stable
release.

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2007-0898 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

02/07/2007  Initial vendor notification
02/13/2007  Initial vendor response
02/15/2007  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES


Permission is granted for the redistribution of this alert electronically.
It may not be edited in any way without the express written consent of
iDefense. If you wish to reprint the whole or any part of this alert in
any other medium other than electronically, please e-mail
customerservice@idefense.com for permission.

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
author nor the publisher accepts any liability for any direct, indirect,
or consequential loss or damage arising from use of, or reliance on, this
information.

 
 


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