ClamAV Remote Code Execution Advisory

Risk: Medium
Local: No
Remote: Yes

CVSS Base Score: 7.6/10
Impact Subscore: 10/10
Exploitability Subscore: 4.9/10
Exploit range: Remote
Attack complexity: High
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

n.runs AG security(at) n.runs-SA-2007.025 24-Aug-2007 ________________________________________________________________________ Vendor: ClamAV, Affected Products: ClamAV, Vulnerability : Remote Code Execution Risk: HIGH ________________________________________________________________________ Vendor communication: 2007/08/10 Initial notification to ClamAV 2007/08/10 ClamAV Responses 2007/08/10 PoC files sent to ClamAV 2007/08/21 ClamAV releases version 0.91.2 2007/08/24 n.runs AG releases a coordinated disclosure advisory ________________________________________________________________________ Overview: Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. The core of the package is an anti-virus engine available in a form of shared library. Description: A remotely exploitable vulnerability has been found in clamav-milter when used with sendmail. In detail, the following flaw was determined: - Arbitrary code execution due to insecure call to popen() Impact: This vulnerability can lead to remote code execution with root privileges. Leading to a complete compromise of the vulnerable system. An attacker can inject shell commands into the recipient field of sendmail, if clamav-milter was started with the black hole mode activated. The vulnerability is present in at least clamav version 0.91.1, prior versions may also be affected. Solution: A new stable release (clamav 0.91.2) is available at the clamav website which fixes the vulnerability. ________________________________________________________________________ Credit: Bugs found by Nikolaos Rangos of n.runs AG. ________________________________________________________________________ References: This Advisory and Upcoming Advisories ________________________________________________________________________ Unaltered electronic reproduction of this advisory is permitted. For all other reproduction or publication, in printing or otherwise, contact for permission. Use of the advisory constitutes acceptance for use in an as is condition. All warranties are excluded. In no event shall n.runs be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if n.runs has been advised of the possibility of such damages. Copyright 2007 n.runs AG. All rights reserved. Terms of use apply.

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